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Kathy Stillman

Author Archives: Kathy Stillman

  1. Why Photo Chemical Machining is Not a Nadcap Special Process

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    Photo Chemical Machining Is Not a Nadcap Special Process: Here’s Why

    Photo chemical machining (PCM), also known as photo etching or chemical milling, is a precision metal fabrication process widely used in industries ranging from aerospace to electronics. It enables manufacturers to produce complex, burr-free parts from thin metals with high repeatability and tight tolerances—without introducing mechanical stresses or heat-affected zones. Despite its use in highly regulated industries, PCM is not considered a “special process” under Nadcap, the global cooperative accreditation program administered by the Performance Review Institute (PRI). Understanding why requires a closer look at how Nadcap defines special processes and what sets PCM apart.

    What Is a Nadcap Special Process?

    Nadcap (National Aerospace and Defense Contractors Accreditation Program) is an industry-managed approach to conformity assessment that focuses on processes that cannot be verified entirely through final inspection or testing. Examples include heat treating, welding, non-destructive testing, chemical processing, and coating—processes in which the results depend heavily on the method, environment, and operator skill, and where defects may be hidden or impossible to correct after the fact.
    In these cases, product quality must be assured through rigorous process control, traceability, and operator qualification. Nadcap accreditation ensures that suppliers meet these expectations, minimizing risk in critical aerospace and defense components.

    Fields of Nadcap activities

    The Nadcap program provides accreditation for special processes in the aerospace and defense industry.

    These include:

    • Aerospace Quality Systems (AQS)
    • Aero Structure Assembly (ASA)
    • Chemical Processing (CP)
    • Coatings(CT)
    • Composites(COMP)
    • Conventional Machiningas a Special Process (CMSP)
    • Elastomer Seals (SEAL)
    • Electronics(ETG)
    • Fluids Distribution (FLU)
    • Heat Treating(HT)
    • Materials Testing Laboratories (MTL)
    • Measurement & Inspection (M&I)
    • Metallic Materials Manufacturing (MMM)
    • Nonconventional Machining and Surface Enhancement (NMSE)
    • Nondestructive Testing(NDT)
    • Non Metallic Materials Manufacturing (NMMM)
    • Non Metallic Materials Testing (NMMT)
    • Sealants(SLT)
    • Welding(WLD)

    Why Photo Chemical Machining Is Different

    PCM does not meet Nadcap’s criteria for classification as a special process for several reasons:
    1. Fully Verifiable Outcomes
    One of the core reasons PCM is excluded from Nadcap’s special processes list is that the results of photo chemical machining are fully inspectable using standard measurement and quality control tools. Features such as dimensions, cut quality, surface finish, and etch depth can be measured and validated after processing. This contrasts with processes like heat treating, where internal microstructural changes are not directly observable and must be inferred through destructive testing or coupons.
    2. Low Process Variability
    PCM is a highly repeatable process when properly controlled. The key variables—photoresist application, UV exposure, and etching chemistry—are managed through automated systems and standard operating procedures that reduce variability. Because the process is largely photographic and chemical in nature, it does not involve the kinds of manual intervention or operator skill that characterize Nadcap special processes like welding or brazing.
    3. No Structural Alteration of Base Material
    Unlike heat treating or surface enhancement processes that alter the metallurgical or mechanical properties of a part, PCM is subtractive—it removes unwanted metal without introducing stress, distortion, or hardness changes. The base material remains unchanged in its properties outside the etched areas, reducing the likelihood of hidden defects that require special oversight.
    4. No Aerospace-Specific Risk Profile
    While PCM is used in aerospace applications—for example, to produce EMI/RFI shielding, fuel system components, or precision screens—its role is typically in producing lightweight or ancillary structures rather than load-bearing or mission-critical components. As such, the risk of catastrophic failure from an undetected flaw in a PCM part is generally much lower than in welded joints, thermally treated parts, or bonded structures, which Nadcap does regulate.

    Industry Standards Still Apply

    Although PCM does not fall under Nadcap’s special process umbrella, the process is still subject to rigorous quality assurance practices. Suppliers must meet ISO 9001 or AS9100 quality system standards and may also comply with customer-specific requirements, such as First Article Inspection (FAI), PPAP documentation, or statistical process control (SPC). Traceability of materials, documentation of process parameters, and regular equipment calibration are standard in any reputable PCM facility.

    Conclusion

    Photo chemical machining is a valuable fabrication technology in high-performance industries, offering precise, clean, and repeatable results without the need for post-processing or mechanical finishing. However, because the quality and conformance of etched parts can be fully verified through conventional inspection methods, PCM does not meet Nadcap’s definition of a special process. Still, aerospace and defense OEMs rely on experienced PCM providers with robust quality systems to ensure their components meet demanding application standards.

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  2. Factors to Consider When Designing Precision Metal Components

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    Comparing Stamping, Laser Cutting, Photo Chemical Machining, and Wire EDM for Precision Metal Components

    In the manufacturing of precision metal components from foil, strip, or sheet metal alloys, selecting the appropriate fabrication method is critical. Several factors—including part geometry, material properties, tolerances, production volumes, and cost—impact the choice between available processes. Among the most commonly used techniques are stamping, laser cutting, photo chemical machining (PCM), and wire EDM (Electrical Discharge Machining). Each method offers unique advantages and constraints, making them suitable for specific applications and production requirements.

    This post provides a comprehensive comparison of these four fabrication processes to guide engineers, designers, and procurement professionals in selecting the most suitable method for their specific needs.

    1. Stamping

    Overview:

    Stamping is a high-speed process that uses mechanical or hydraulic presses and custom-designed dies to shape or cut sheet metal. It encompasses a variety of techniques including blanking, punching, bending, embossing, and coining.

    Suitable Materials:

    • Steel (carbon, stainless)
    • Aluminum
    • Brass
    • Copper
    • Titanium
    • Specialty alloys

    Process Characteristics:

    • Tooling: Requires hardened steel dies and punches
    • Speed: Very high—ideal for mass production
    • Precision: ±0.01 mm or better with proper tooling
    • Thickness Range: Typically 0.005″ to 0.250″ (0.13 mm to 6.35 mm), depending on material and part size
    • Minimum Feature Size: Limited by die capabilities; sharp internal corners may be difficult
    • Setup Time: High (due to die design and testing)
    • Lead Time: Weeks for tooling; fast production once set up

    Advantages:

    • Exceptional production speed and cost-effectiveness at high volumes
    • Consistent quality and repeatability
    • Capable of complex 3D forms through progressive dies
    • Long tool life with proper maintenance

    Limitations:

    • High initial tooling cost and long lead time
    • Not economical for small batches or prototyping
    • Design changes require costly die modifications
    • Burrs and deformation may occur in thin or soft metals

    Best Applications:

    • Automotive components
    • Connectors and terminals
    • Electronic enclosures
    • Battery contacts
    • High-volume appliance parts

    1. Laser Cutting

    Overview:

    Laser cutting uses a focused laser beam to melt, burn, or vaporize material along a programmed path. CNC systems control the movement of the laser head and material.

    Suitable Materials:

    • Most metals, including steel, aluminum, copper, brass, and titanium
    • Reflective materials require special lasers (e.g., fiber lasers)

    Process Characteristics:

    • Tooling: No physical tooling; requires digital CAD files
    • Speed: Moderate to high (depends on material thickness and complexity)
    • Precision: ±0.025 mm or better
    • Thickness Range: Typically up to 20 mm for steel; thinner foils also supported
    • Minimum Feature Size: ~0.1 mm, depending on laser beam width
    • Setup Time: Very low
    • Lead Time: Short—ideal for prototypes and low to medium volumes

    Advantages:

    • Excellent precision and edge quality
    • High flexibility—easy to modify designs
    • Minimal physical contact reduces distortion
    • No tooling costs—ideal for prototypes or frequent design changes

    Limitations:

    • Heat-affected zones (HAZ) may cause microstructural changes or warping
    • Not ideal for very thick metals or parts requiring tight tolerances over long runs
    • Slower than stamping for large production volumes
    • May leave oxide layers or require post-processing

    Best Applications:

    • Prototypes and short-run components
    • Decorative or complex cutouts
    • Medical device parts
    • Aerospace brackets
    • Custom enclosures

    1. Photo Chemical Machining (PCM)

    Overview:

    Photo chemical machining (also called photo etching or photochemical milling) involves coating the metal with a photoresist, exposing it to a patterned UV light source, and etching away exposed areas using acid or other chemicals. This process is especially suited for thin metal parts requiring intricate detail.

    Suitable Materials:

    • Stainless steel
    • Carbon and silicon steels
    • Nickel and nickel alloys
    • Copper and copper alloys
    • Aluminum
    • Beryllium copper
    • Molybdenum
    • Silver

    Process Characteristics:

    • Tooling: Photomasks produced from CAD designs
    • Speed: Moderate (includes chemical processing time)
    • Precision: ±0.04mm (or better with optimized parameters)
    • Thickness Range: 0.0005″ to 0.060″ (0.013 mm to 1.5 mm)
    • Minimum Feature Size: ~0.06 mm; aspect ratio dependent
    • Setup Time: Moderate (requires photo tooling and chemical baths)
    • Lead Time: ~4 weeks typical

    Advantages:

    • No mechanical or thermal stress on material—ideal for delicate foils
    • Extremely fine detail possible; excellent for micro-scale geometries
    • Burr-free parts with smooth edges
    • Can process multiple parts simultaneously from large sheets

    Limitations:

    • Not ideal for thick materials
    • Material compatibility limited to those not resistant to chemical etchants
    • Disposal and handling of chemicals add environmental and safety considerations
    • Less suitable for structural parts with forming or bending

    Best Applications:

    • EMI/RFI shielding
    • Lead frames
    • Encoders and precision apertures
    • Fuel cell plates
    • Medical screens and mesh components

    1. Wire EDM (Electrical Discharge Machining)

    Overview:

    Wire EDM is a non-contact machining process that uses a continuously fed thin wire and electrical discharges (sparks) to cut conductive metals submerged in dielectric fluid.

    Suitable Materials:

    • Any electrically conductive metal: tool steel, titanium, aluminum, Inconel, tungsten, etc.

    Process Characteristics:

    • Tooling: Requires CAD/CAM programming, but no physical dies
    • Speed: Slow (especially on thick or complex geometries)
    • Precision: Exceptional—±0.002 mm or better
    • Thickness Range: 0.1 mm up to 300 mm+
    • Minimum Feature Size: Wire diameter limited (~0.02–0.3 mm); internal corners have small radii
    • Setup Time: Low to moderate
    • Lead Time: Moderate; often longer than laser/PCM for same part

    Advantages:

    • Capable of extremely tight tolerances and fine finishes
    • Excellent for hard or exotic materials
    • No mechanical force—no warping or distortion
    • Capable of complex internal geometries

    Limitations:

    • Slow cutting speed—not economical for large batches
    • Limited to conductive materials
    • Wire path requires start hole (pre-drilling needed in some cases)
    • High energy consumption per part

    Best Applications:

    • Precision tooling and dies
    • Aerospace and medical implants
    • Microfluidic components
    • Fine gears and intricate mechanical parts
    • Prototyping high-tolerance conductive parts

    Process Comparison Summary

    Feature Stamping Laser Cutting Photo Chemical Machining Wire EDM
    Volume Suitability High-volume production Low to mid-volume, prototyping Low to mid-volume Low-volume, high-precision
    Tooling Cost High (custom dies) None (uses CAD) Low to moderate (photomask) None (uses CAD/CAM)
    Setup Time Long Very short Moderate Moderate
    Per-Unit Cost (Low Vol.) High Moderate Moderate High
    Per-Unit Cost (High Vol.) Low Moderate to high Moderate High
    Feature Resolution Moderate High Very high Ultra high
    Edge Quality Burrs possible Clean, but may oxidize Burr-free, clean Burr-free, mirror finish
    Thermal/Mechanical Stress Yes Heat-affected zone (HAZ) None None
    Material Limitations Broad Broad Limited to etchable metals Conductive only
    Design Flexibility Low (hard to modify) High High High

    Selecting the Right Process

    Choosing the right process depends on several critical factors:

    1. Volume and Cost
    • Stamping is ideal for high-volume production due to its speed and low per-part cost after tooling.
    • Laser cutting and PCM offer more flexibility and lower setup costs, better suited for small to medium batches or frequent design iterations.
    • Wire EDM is best reserved for small-batch, high-precision work due to slower cycle times and higher per-part costs.
    1. Part Complexity and Precision
    • For intricate, burr-free, and stress-free parts from thin foils, PCM excels.
    • When tight tolerances and internal features are critical, wire EDM is unmatched.
    • Laser cutting handles most 2D geometries with good accuracy, while stamping shines in complex 3D forming through progressive dies.
    1. Material Considerations
    • Wire EDM works on any conductive metal, regardless of hardness.
    • PCM is more restricted by chemical compatibility.
    • Laser cutting and stamping accommodate a wide range of alloys.
    1. Time-to-Market and Prototyping
    • Laser cutting and PCM offer the shortest lead times with minimal tooling, making them ideal for prototypes.
    • Stamping is less suitable for early design validation due to tooling investment.
    • Wire EDM, while slower, is useful for prototype-quality parts needing extreme precision.

    Conclusion

    Each of the four fabrication processes—stamping, laser cutting, photo chemical machining, and wire EDM—has its strengths and ideal applications. The choice between them should be guided by a careful balance of design complexity, tolerance requirements, material selection, volume needs, and budget.

    • Use stamping for high-speed, high-volume production where initial tooling investment can be amortized.
    • Choose laser cutting for flexible, quick-turn manufacturing with moderate tolerances.
    • Opt for PCM when producing thin, intricate, burr-free components with tight tolerances.
    • Rely on wire EDM for low-volume, highly complex parts that require exceptional precision and finish.

    Selecting the right process can dramatically affect the efficiency, cost, and quality of your final product—making this decision a cornerstone of successful component manufacturing.

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  3. Complex sCO2 Stirling Engine Designs Enabled by Photo Chemical Machining

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    The Benefits of Photo Etching for Super-Critical CO₂ Stirling Engine Designs

    As the demand for high-efficiency, sustainable energy systems grows, super-critical carbon dioxide (sCO₂) Stirling engines are emerging as a promising solution for clean power generation. These engines leverage the thermodynamic advantages of sCO₂ to achieve compact, efficient, and high-performance operation. However, the success of these advanced engines depends heavily on the precision and reliability of their internal components—many of which require complex geometries and must operate in high-pressure, high-temperature environments. Photo etching, also known as chemical etching, offers a suite of benefits uniquely suited to meeting these challenges.

    Precision Engineering for Thermodynamic Efficiency

    sCO₂ Stirling engines operate under extreme conditions to maximize energy extraction from a given heat source. This requires components like heat exchangers, regenerator plates, flow channels, and seals to be manufactured with exacting precision. Photo etching excels in producing highly detailed tight tolerance metal parts. Fine features such as microchannels, fins, and flow passages can be manufactured in complex patterns that optimize heat transfer and fluid dynamics—critical for the high efficiency expected from sCO₂ cycles.

    Unlike mechanical methods such as stamping or CNC machining, photo etching is a subtractive, mask-based process that allows for extremely fine resolution without the risk of part distortion or mechanical stress. This is particularly important in regenerator matrices and microchannel heat exchangers, where maintaining precise geometries directly impacts system performance.

    Stress-Free and High-Integrity Parts

    In high-pressure Stirling engine applications, mechanical integrity is paramount. Components must maintain their shape and function under severe thermal and pressure stresses. Photo etching is a non-contact, room-temperature process, meaning no heat or force is applied to the metal during fabrication. As a result, the parts produced are completely stress-free, with no work hardening or microfractures that could compromise durability.

    This characteristic is especially valuable for thin metal foils and multi-layered assemblies used in regenerators or compact heat exchangers. The ability to create flat, burr-free, and deformation-free parts ensures reliable sealing, optimal thermal conduction, and structural consistency—key requirements in high-performance Stirling engine environments.

    Enabling Compact, Multi-Layer Designs

    One of the unique benefits of photo etching is its compatibility with stacked or laminated metal structures. In sCO₂ Stirling engines, compactness is often a design priority, and multi-layer heat exchangers or flow structures are common. Photo-etched plates can be designed with precise alignment features, bonding points, and complex internal geometries that allow them to be easily stacked into three-dimensional assemblies.

    This opens up innovative design possibilities—such as regenerative matrices with optimized porosity, or heat exchangers with finely tuned thermal paths—without the need for costly or complex manufacturing techniques. Engineers can iterate quickly on prototypes or scale up to production volumes without changing tooling, since photo etching uses photomasks and digital designs instead of dies.

    Material Versatility for Demanding Conditions

    sCO₂ systems operate at temperatures and pressures that require corrosion-resistant and heat-tolerant materials such as stainless steel, Inconel, and other alloys. Photo etching is compatible with these materials, allowing for the production of durable parts that maintain their performance over extended periods in challenging conditions.

    The process can also accommodate thin-gauge metals while maintaining high dimensional accuracy, making it suitable for lightweight, compact components that must endure both thermal cycling and corrosive sCO₂ environments. With material properties left untouched by the etching process, the integrity of advanced alloys is fully preserved.

    Cost Efficiency and Design Flexibility

    For developers of cutting-edge sCO₂ Stirling engines, photo etching provides both affordability and flexibility. Since no hard tooling is required, design modifications can be implemented quickly and without major cost implications. This is ideal for R&D environments, where rapid iteration and performance testing are crucial.

    Even at scale, photo etching remains cost-effective—particularly for high-precision, thin metal components that would be prohibitively expensive or difficult to machine. The process produces minimal waste and does not require secondary finishing, further reducing overall production costs.

    Conclusion

    Super-critical CO₂ Stirling engines represent a next-generation solution for efficient, sustainable power generation. Their success hinges on precision, durability, and compact design—all areas where photo etching excels. By enabling the fabrication of intricate, high-performance components with speed, accuracy, and material integrity, photo etching plays a vital role in advancing sCO₂ engine technology and unlocking its full potential in a carbon-conscious energy landscape.

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  4. The Benefits of Photo Etching for EV Battery Applications

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    EV battery designs in a variety of alloys

    Key Aspects of Using PCM For EV Battery Elements

    As the global transition to electric vehicles (EVs) accelerates, the demand for innovative manufacturing techniques that enhance efficiency, performance, and sustainability is rapidly increasing. One such technology gaining prominence in EV battery applications is photo etching, also known as chemical etching. This precise, cost-effective, and versatile process offers a range of advantages for the production of battery components, particularly in the context of battery current collectors, busbars, interconnects, and cooling plates.

    Unparalleled Precision for Complex Designs

    Photo etching enables the creation of intricate, high-resolution metal components with exceptional accuracy. Using photoresist and a controlled chemical etching process, manufacturers can produce parts with fine features and tight tolerances—down to just a few microns. This is particularly beneficial in EV batteries, where compact, lightweight, and intricately shaped metal parts are essential for maximizing energy density and minimizing space.

    For example, battery current collectors and busbars often feature intricate geometries that optimize electrical conductivity while minimizing weight. Photo etching allows for these complex patterns to be produced repeatably and without the need for expensive tooling, which is a significant advantage over traditional stamping or laser cutting.

    Material Integrity and Stress-Free Manufacturing

    Unlike mechanical methods such as stamping or punching, photo etching is a non-contact, non-thermal process. This means there is no mechanical deformation or heat-induced stress on the metal, preserving the integrity, flatness, and mechanical properties of the material. In EV batteries, where performance is closely tied to the structural reliability and consistency of components, this benefit is crucial.

    Stress-free components are particularly important for thin metal parts used in battery interconnects and foils. Maintaining flatness and surface uniformity ensures optimal contact between layers, improving thermal and electrical conductivity while reducing the risk of failure due to mechanical fatigue or distortion.

    Scalability and Design Flexibility

    One of the most appealing aspects of photo etching is its scalability and rapid prototyping capability. Because the process relies on digital artwork and phototools rather than hard tooling, design changes can be made quickly and at minimal cost. This is ideal for the fast-paced development cycles common in the EV industry, where battery technology is evolving rapidly, and manufacturers must continuously refine their designs to stay competitive.

    Whether for short production runs, pilot programs, or full-scale manufacturing, photo etching accommodates a wide range of production volumes without significant changes in cost structure. This makes it an attractive option for both established EV manufacturers and startups looking to innovate quickly and affordably.

    Compatibility with Advanced Materials

    EV batteries increasingly rely on advanced materials, including high-performance alloys and composite laminates, to achieve better thermal management, energy efficiency, and durability. Photo etching is compatible with a wide variety of metals, including copper, aluminum, stainless steel, and nickel—all commonly used in battery components.

    Furthermore, multi-layer metal parts or hybrid assemblies can be easily etched and stacked with consistent accuracy. This opens the door to creative engineering solutions for issues like heat dissipation, weight reduction, and improved energy transfer.

    Sustainability and Cost Efficiency

    In addition to performance benefits, photo etching offers environmental and economic advantages. The process generates minimal waste compared to mechanical machining or stamping, and unused metal sheets can often be recycled. Additionally, the lack of expensive tooling and the reduced need for secondary finishing steps (like deburring) translate to lower production costs and faster turnaround times.

    In a sector where efficiency and sustainability are key drivers, these attributes make photo etching a compelling choice for manufacturers seeking to align their production methods with eco-conscious and cost-effective goals.

    Conclusion

    As electric vehicles continue to shape the future of mobility, the technologies used to manufacture their batteries must keep pace. Photo etching stands out as a high-precision, flexible, and sustainable solution for producing critical EV battery components. Its ability to deliver intricate, reliable, and cost-efficient metal parts makes it an invaluable asset in the ongoing evolution of battery design and performance.

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  5. How Photo Etching Benefits Production of PEM Elements for Fuel Cells

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    PEM Fuel Cells Lead the Way

    In the rapidly evolving world of clean energy, proton exchange membrane (PEM) fuel cells stand at the forefront of innovation, offering efficient and eco-friendly power sources for a wide range of applications—from automotive and aerospace to portable power and stationary systems. Central to their functionality are the intricate components within the PEM stack, particularly flow fields, bipolar plates, and current collectors. Producing these elements with high precision, efficiency, and repeatability is essential to the performance and reliability of fuel cells. One technology that is proving to be exceptionally well-suited to this task is photo chemical machining (PCM).

    Photo chemical machining, also known as photo etching, is a subtractive manufacturing process that uses a photoresist and chemical etchants to produce complex and highly precise metal components. The process involves coating a metal sheet with a light-sensitive resist, exposing it to UV light through a photo-tool (mask), and then etching away the exposed or unexposed areas (depending on the resist type) with a chemical solution. This results in finely detailed parts that are free from burrs, mechanical stress, and thermal distortion.

    For fuel cell designers, PCM offers a number of compelling benefits in the production of PEM elements:

    High Precision and Design Flexibility

    Fuel cells require intricate flow field patterns to effectively manage the distribution of hydrogen and oxygen, as well as the removal of water and heat. PCM allows for micron-level precision and extremely fine geometries, enabling the creation of complex channel designs that maximize efficiency and performance. Design modifications can be made quickly and cost-effectively, giving engineers the flexibility to iterate and optimize without investing in new tooling.

    Burr-Free and Stress-Free Parts

    Unlike stamping, laser cutting, or traditional machining, PCM does not involve physical contact with the material. This means no mechanical stress is introduced into the metal, and the resulting parts are completely free from burrs or sharp edges. This is particularly critical in PEM fuel cells, where clean and smooth surfaces are essential to ensure proper sealing, electrical conductivity, and fluid dynamics.

    Suitability for Thin and Exotic Metals

    PEM components are often made from thin stainless steels, titanium, and nickel alloys—materials that are challenging to process using conventional methods. PCM excels at handling thin-gauge metals, often in the range of 0.001” to 0.040” thick, without warping or damaging them. Additionally, PCM supports a wide variety of metal types, including corrosion-resistant and high-conductivity alloys, which are ideal for fuel cell environments.

     Rapid Prototyping and Scalable Production

    One of the most significant advantages of PCM is the ease and speed with which prototypes can be developed. Tooling is digital and inexpensive, typically involving just a photo-tool and minimal setup. This makes PCM an excellent choice for early-stage fuel cell development, where rapid iterations are needed. Once the design is finalized, the process scales easily into medium to high-volume production with consistent quality.

    Production Strategies to Maximize Production Efficiency

    Because PCM’s cost is largely independent of design complexity, intricate PEM elements can be manufactured at competitive prices. This opens the door to more innovative designs that improve performance without driving up production costs. Furthermore, there is minimal material waste, as parts are nested efficiently and material usage is optimized.

    Conclusion

    Photo chemical machining offers a unique combination of precision, material compatibility, flexibility, and cost-effectiveness, making it an ideal technology for producing PEM elements in fuel cell systems. As the demand for clean energy solutions grows, PCM empowers fuel cell designers to push the boundaries of efficiency and innovation, turning advanced fuel cell concepts into reality faster and more economically than ever before.

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  6. Design Considerations for Photo Chemical Machining (PCM)

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    When Conventional Processes Don’t Fit The Bill…

    Photo chemical machining (PCM), also known as photo etching or chemical etching, is a powerful subtractive manufacturing process ideal for producing intricate metal parts with tight tolerances and complex geometries. It offers several advantages—such as stress-free processing, no burrs, and the ability to handle high-precision, thin-gauge materials—that make it particularly attractive for industries like aerospace, electronics, medical devices, and automotive. However, to fully leverage the benefits of PCM, engineers and designers must understand its unique design considerations.

    Material Selection Options for Photo Etching

    PCM is compatible with a wide range of metals, including stainless, carbon and electrical steels, copper alloys, aluminum, nickel, silver, molybdenum, and range of specialty alloys. Material thickness typically ranges from 0.001″ to 0.080″, though optimal thickness is usually below 0.040″ for the best precision and cost-effectiveness. It’s critical to consider how the chemical etchants interact with your chosen metal. For instance, stainless steel and copper are very etch-friendly, whereas materials like silver and molybdenum require special etchants. A non-exhaustive list of alloys is here.

    Feature Size and Tolerance

    One of PCM’s major advantages is its ability to produce features as small as 0.004″ with tolerances as tight as ±0.001″, depending on material thickness and feature geometry. A useful rule of thumb is that the minimum feature size (hole diameter, slot width, etc.) should be no less than 110% of the metal thickness. For example, if you’re using 0.010″ thick material, the smallest practical hole size is about 0.011″.

    Designers should note that tolerances are generally tighter on features that run parallel to the sheet surface (X-Y plane) than those involving depth (Z-axis), due to the isotropic nature of chemical etching. PCM is not a suitable method for parts requiring sharp internal corners or deeply etched pockets with vertical sidewalls.

    Chemical Etch Compensation and Undercutting

    Chemical etching removes material uniformly from both sides of the metal sheet. This means features will slightly undercut the mask dimensions due to lateral etching. To account for this, designers must include etch compensation: a minor increase in the size of features in the phototool to achieve the desired final dimension. The amount of compensation depends on the material and thickness but is typically in the range of 10–20% of the material thickness.

    Rounded internal corners are another natural outcome of the process. While this may not be suitable for all designs, it’s often acceptable or even beneficial in applications where sharp corners could cause stress concentrations.

    Part Nesting and Material Utilization

    PCM lends itself well to cost-efficient production through sheet nesting—placing multiple parts on a single metal sheet. Designers should aim to maximize material usage while maintaining minimum web spacing between parts (often around 0.020″ to 0.050″) to avoid sheet distortion during processing.

    Tabs or micro-joints are commonly used to keep individual parts attached to the parent sheet during etching, which simplifies handling and post-processing. These tabs are typically very small and can be easily broken or laser-cut after etching.

    Marking, Bending, and Secondary Operations

    Chemical etching allows for fine surface texturing or part numbering during the same process as the part formation. This can include logos, part numbers, or orientation marks—without adding cost or time. If parts will undergo forming or bending after etching, this should be accounted for in the design stage. Radiused corners and proper bend allowances are necessary to avoid cracking or distortion.

    Secondary operations like plating, passivation, or forming may follow PCM, so designs should be compatible with these processes. Engineers should communicate these post-processing requirements early to ensure dimensional stability and performance throughout the manufacturing lifecycle.

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    Conclusion

    Designing for photo chemical machining requires a shift in mindset from traditional mechanical fabrication methods. By embracing PCM’s strengths—fine detail, no mechanical stress, and efficient prototyping—designers can unlock new levels of precision and flexibility in metal part manufacturing. By carefully considering material properties, feature tolerances, etch behaviors, and downstream operations, engineers can create designs optimized for quality, performance, and cost-efficiency.

  7. Supply Chain: Checklist for Photo Etching

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    6 Reasons to Consider Photo Chemical Machining for Precision Metal Parts Production
    In the fast-paced world of manufacturing, supply chain professionals must continuously evaluate the most efficient and cost-effective methods for producing precision metal parts. One technique that often goes underappreciated is photo chemical machining (PCM). PCM, also known as photochemical etching, is a subtractive manufacturing process that uses chemical etchants to remove material with high precision. This method offers significant advantages in specific scenarios, making it an ideal choice for certain applications. But when should supply chain professionals consider PCM over other manufacturing techniques such as stamping, laser cutting, or CNC machining? Here are the key factors to evaluate:

    Complex Geometries and Fine Features
    One of the strongest advantages of PCM is its ability to produce intricate, complex geometries with exceptional accuracy. Unlike traditional machining or stamping, which may struggle with fine details, PCM can create highly detailed patterns, including sharp corners, thin walls, and micro-perforations, all without the risk of mechanical stress or distortion. This makes it particularly useful for applications in electronics, aerospace, medical devices, and filtration components where high precision is required.

    Thin Metal Components
    PCM is an excellent option when working with thin metal sheets, typically ranging from 0.01mm to 1.5mm in thickness. Traditional methods like stamping or laser cutting may deform thin materials due to excessive force or heat, leading to inconsistencies in the final product. PCM, on the other hand, ensures that the structural integrity of the metal remains intact, producing burr-free and stress-free parts. This is particularly beneficial for industries requiring lightweight but strong components, such as aviation, defense, and microelectronics.

    Prototyping and Small to Medium Production Runs
    For supply chain professionals dealing with prototyping and small-to-medium batch production, PCM presents a cost-effective solution. Unlike stamping or die-cutting, which require expensive tooling and long lead times, PCM utilizes inexpensive phototools that can be quickly produced or modified. This allows for rapid design iterations and low-cost adjustments, making it an ideal choice for new product development or custom manufacturing applications.

    Material Versatility
    PCM can be used with a wide range of metals, including stainless steel, copper, brass, aluminum, titanium, and even exotic alloys like Inconel. Unlike some traditional machining methods that may struggle with harder or brittle materials, PCM etches away metal uniformly without inducing mechanical stress. This versatility makes it an attractive option for industries requiring corrosion-resistant, high-strength, or temperature-resistant materials.

    Elimination of Mechanical Stress and Heat-Affected Zones
    Mechanical processes such as stamping and laser cutting can introduce stress, warping, and heat-affected zones (HAZ) in metal components, potentially altering their mechanical properties. PCM eliminates these issues because it is a chemical process rather than a mechanical or thermal one. This results in components with superior dimensional stability and integrity, particularly important for precision applications in the medical, semiconductor, and aerospace industries.

    Cost-Effectiveness in the Right Context
    While PCM is not always the most economical choice for very high-volume production, it offers significant cost advantages in cases where expensive tooling or extensive secondary operations would otherwise be needed. Supply chain professionals should consider PCM when:

    Tooling costs for stamping or CNC machining are prohibitively high.
    Design changes are frequent and require a flexible manufacturing process.
    The component’s complexity makes other methods inefficient or costly.
    Material waste must be minimized, as PCM generates very little scrap.
    Final Thoughts
    Photo chemical machining is a valuable tool for supply chain professionals managing the production of precision metal components. Its ability to create intricate geometries, work with a variety of materials, and eliminate mechanical stress makes it an attractive alternative to conventional machining and stamping methods. While it may not be suitable for all manufacturing scenarios, PCM is an excellent choice for prototyping, small-to-medium production runs, and applications requiring ultra-precise, burr-free, and stress-free components. By understanding the strengths of PCM, supply chain professionals can make more informed decisions, optimizing cost, quality, and efficiency in their manufacturing operations.

  8. Memory Triggers for Engineers/Designers: When to Choose Photo Etching

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    8 Things to Remember About PCM

    In the world of precision metal part manufacturing, choosing the right process can make the difference between success and frustration. Engineers and designers often default to conventional methods such as CNC machining, stamping, or laser cutting. However, there are key memory triggers that should remind them to consider Photo Chemical Machining (PCM) as a superior alternative in many scenarios. PCM is a precise, cost-effective, and efficient method, particularly suited for thin metal parts with intricate features. Here are the primary memory triggers that signal when PCM is the better choice.

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  9. Essential Resources for Designers and Engineers Exploring PCM

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    For designers and engineers working with precision metal components, understanding the capabilities of photochemical machining (PCM) is crucial for leveraging its full potential. Whether you’re exploring PCM for the first time or looking for the best service providers, having the right resources at your fingertips can streamline the process. This blog post highlights key sources of information on PCM capabilities, service providers, and industry insights.

    1. Industry Associations and Standards Organizations

    Photo Chemical Machining Institute (PCMI)

    • Website: www.pcmi.org
    • Why it’s useful: PCMI is the leading industry organization dedicated to photochemical machining. It offers technical resources, research papers, training opportunities, and networking events where professionals can connect with PCM providers and experts.

    ASTM International (ASTM E150-18)

    • Website: www.astm.org
    • Why it’s useful: ASTM E150-18 outlines standard testing methods for metal etching processes, including PCM. Engineers looking for precise specifications and quality standards can refer to ASTM documents to ensure compliance in their designs.

    SAE International

    • Website: www.sae.org
    • Why it’s useful: For engineers in the aerospace and automotive sectors, SAE provides industry-specific guidance on material selection and precision metal manufacturing processes, including PCM applications.
    1. Leading Photochemical Machining Service Providers

    Many companies specialize in PCM, offering expertise in fine metal etching and component manufacturing. Below are some of the most well-known providers:

    Precision Micro

    • Website: www.precisionmicro.com
    • Why it’s useful: A Europe-based leader in PCM, Precision Micro provides technical insights on materials, design guidelines, and case studies on applications across industries like medical, aerospace, and electronics.

    Conard Corporation

    • Why it’s useful: Conard offers detailed guidelines on designing for PCM, including minimum feature sizes, tolerances, and surface finish considerations.

    Tech Etch

    • Website: www.tech-etch.com
    • Why it’s useful: Tech-Etch is a well-established U.S. PCM provider with a strong focus on precision components for medical, defense, and telecommunications applications. Their design guide is a must-read for engineers working with PCM.

    Etchform (Part of Muon Group)

    • Website: www.etchform.com
    • Why it’s useful: Based in the Netherlands, Etchform specializes in high-precision etching of metals like titanium and molybdenum, ideal for advanced engineering applications.

    Veco Precision

    • Website: www.vecoprecision.com
    • Why it’s useful: A global leader in precision metal etching, Veco offers a comprehensive knowledge base, including white papers, webinars, and case studies on PCM technology.
    1. Design Guides and Technical Papers

    For engineers designing components for PCM, having access to design guides is critical. Here are some excellent resources:

    Precision Micro’s Photochemical Etching Design Guide

    • Website: Precision Micro Design Guide
    • Why it’s useful: Covers everything from material selection to dimensional tolerances and etching depth considerations.

    Tech-Etch’s Design Guide

    • Website: Tech-Etch Design Guide
    • Why it’s useful: A detailed PDF outlining best practices, including feature size limitations and recommended tolerances.

    Conard Corporation’s Design Guide

    Springer & Elsevier Research Papers

    • Websites: SpringerLink | Elsevier
    • Why it’s useful: Engineers and researchers can find peer-reviewed studies on PCM, covering advancements in materials, etching techniques, and industrial applications.
    1. Online Communities and Forums

    For real-world discussions, troubleshooting, and networking, engineers can engage with PCM professionals through online communities:

    Eng-Tips Forums (Chemical Machining Section)

    • Website: www.eng-tips.com
    • Why it’s useful: A place for engineers to ask technical questions, share experiences, and discuss challenges related to PCM.

    Reddit – r/Manufacturing & r/Engineering

    LinkedIn Groups

    • Search Terms: “Photochemical Machining,” “Precision Metal Etching,” “Advanced Manufacturing”
    • Why it’s useful: LinkedIn hosts industry professionals, company updates, and discussions on the latest trends in PCM.
    1. Webinars, Conferences, and Trade Shows

    Attending industry events provides networking opportunities and firsthand exposure to the latest PCM advancements.

    PCMI International Conference

    • Website: PCMI Conferences
    • Why it’s useful: An excellent event for learning about new PCM technologies and networking with suppliers and engineers.

    IMTS (International Manufacturing Technology Show)

    • Website: www.imts.com
    • Why it’s useful: One of the largest manufacturing trade shows in the world, featuring exhibitors from the PCM industry.

    MD&M (Medical Design & Manufacturing Expo)

    • Website: www.mdmeast.com
    • Why it’s useful: Ideal for those designing precision components for medical applications.

    FABTECH

    • Website: www.fabtechexpo.com
    • Why it’s useful: A major event showcasing innovations in metal fabrication, including PCM technology.

    Conclusion

    For designers and engineers working with precision metal components, photochemical machining is a powerful manufacturing process. Leveraging the right resources—whether industry associations, service providers, design guides, online forums, or conferences—can help professionals stay informed and make better design decisions.

    By tapping into these resources, you can learn more about PCM’s capabilities, compare service providers, and ensure your designs take full advantage of this precise and cost-effective etching technology

     

  10. How Power Generation and Storage Systems Benefit from PCM Fabricating

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    Micrometal Bipolar plate Photochemical Machining

    Capable of Intricate Patterns and Geometries

    Photochemical machining (PCM), also known as photochemical etching, is a highly precise and versatile subtractive manufacturing process used to fabricate complex metal components. It employs photoresist and chemical etching techniques to produce intricate patterns and geometries with tight tolerances and no mechanical stress on the material. In the realm of power generation and storage systems—ranging from fuel cells to batteries—PCM offers significant performance enhancements by enabling the creation of components that are lighter, more efficient, and more durable.

    High-Precision Parts with Micro-Scale Features

    One of the most critical contributions of PCM to power generation and storage lies in its ability to manufacture high-precision metal parts with micro-scale features. For fuel cells, particularly proton exchange membrane (PEM) and solid oxide types, PCM is instrumental in producing bipolar plates. These plates are responsible for distributing gases, conducting electricity, and managing water and heat within the cell. Using PCM, manufacturers can produce bipolar plates with highly uniform and intricate flow field patterns. These precise patterns optimize gas flow and thermal distribution, directly improving the efficiency and longevity of the fuel cell.

    Moreover, PCM’s capability to create thin, lightweight components from high-performance metals such as stainless steel and nickel alloys reduces the overall weight and size of power systems without compromising structural integrity. This is especially crucial in applications like electric vehicles (EVs) and aerospace systems, where weight reduction translates to enhanced energy efficiency and extended operational range. PCM also supports the fabrication of components with sharp internal corners and fine slots, features that would be difficult or impossible to produce.

    Current Collectors and Mesh Structures for Batteries

    In battery technologies, especially in lithium-ion and emerging solid-state batteries, PCM is used to produce intricate current collectors and mesh structures. These components must provide excellent conductivity while maintaining a minimal profile to maximize the volume available for active material. PCM enables the production of ultra-thin, corrosion-resistant metal meshes with complex geometries that improve ion transport and current distribution. Enhanced current collection contributes to better charge/discharge rates, longer cycle life, and overall improved battery performance.

    Another notable advantage of PCM in these systems is its burr-free, stress-free processing. Traditional machining methods often introduce mechanical stress or thermal distortion into the components, which can compromise their mechanical and electrochemical properties. PCM, by contrast, uses no mechanical force or high heat, thus preserving the integrity of the material. This is particularly valuable in components that must maintain high conductivity and resistance to fatigue over thousands of charge-discharge or power cycles.

    Rapid Prototyping and Cost-Effective Production

    Additionally, PCM allows for rapid prototyping and cost-effective production runs, from small batches to large-scale manufacturing. This agility is vital for innovation in energy systems, where rapid iteration and customization are often needed to optimize performance for specific applications. It also supports design flexibility, allowing engineers to quickly test new architectures and geometries that might otherwise be cost-prohibitive with traditional tooling.

    Eco-Friendly

    Environmental sustainability is another area where photochemical machining adds value. The process generates minimal waste and does not rely on lubricants or cutting oils, making it more environmentally friendly. In power generation and storage, where lifecycle environmental impact is a growing concern, PCM contributes to greener manufacturing processes.

    Improved Performance and Efficiency

    In summary, photochemical machining significantly enhances the performance and efficiency of components used in fuel cells and batteries. Its ability to produce lightweight, precise, and complex metal parts with no mechanical stress enables the design of more efficient, durable, and compact energy systems. As the demand for high-performance, sustainable power generation and storage technologies grows, PCM is poised to play an increasingly pivotal role in advancing the capabilities of next-generation energy solutions.

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