photochemical etching vs laser cutting, stamping and CNC machining
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photochemical etching vs laser cutting, stamping and CNC machining
Photochemical etching, laser cutting, stamping and CNC machining are all used to make metal parts, but they behave very differently for thin, intricate components with fine features. Photochemical etching is usually the best choice for thin (25µm to 2mm), complex, burr-free parts made in prototype-to-high volumes, because it is repeatable, introduces no mechanical stress and no heat-affected zone and carries low tooling cost. This guide explains how the four processes compare and when to use each.
Tecan is a photochemical etching specialist, manufacturing precision etched components since 1970.
at a glance: how the four processes compare
| Factor | Photochemical etching | Laser cutting | Stamping | CNC machining |
|---|---|---|---|---|
| Burrs | None | Minimal, some dross | Burrs common | Burrs common |
| Mechanical stress | None | Some | High (work-hardening) | Moderate |
| Heat-affected zone | None | Yes | None | Minimal |
| Best material thickness | Thin (25µm–2mm) | Thin–medium | Thin–medium | Medium–thick |
| Feature complexity | Very high (whole sheet at once) | High | Fixed per tool | High |
| Tooling cost | Low (digital tooling) | Low | High (hard tooling) | Low–none |
| Design changes | Fast and cheap (digital tooling) | Fast | Slow and costly | Fast |
| Prototyping speed | Days, direct from drawing | Fast | Slow (tool build) | Fast |
| Best volume fit | Prototype to high volume | Low–medium | High volume | Low–medium |
Figures are general guidance; confirm specific capabilities for your part.
photochemical etching
Photochemical etching (also called chemical etching or photo-chemical machining) uses a light-defined resist and chemical etchants to dissolve unwanted metal away, leaving a precise, burr-free part. Because the design is transferred using lithography rather than with hard tooling, there is no tooling to cut and designs can be changed freely between iterations.
Use it when: parts are thin and intricate, you need burr-free and stress-free components, flatness and material properties must be preserved, or you want to prototype quickly and scale to volume without new tooling. It is often the most precise and cost-effective option for fine-featured thin-metal parts.
laser cutting
Laser cutting uses a focused laser to melt or vaporise metal along a cut path. It is fast and flexible for one-off and low-volume profiles, but it applies localised heat, creating a heat-affected zone that can alter the metal near the cut and leave some dross on thin or fine-featured parts.
Use it when: you need quick individual profiles or medium-thickness parts and a heat-affected edge is acceptable. It is less suited to very fine features across thin sheet, where the heat-affected zone and edge quality matter.
stamping
Stamping (pressing) uses hard tooling to punch and form parts at high speed. Once the tool exists, per-part cost at high volume is low, but the hard tooling is expensive and slow to produce and change, and stamping work-hardens the metal and tends to leave burrs.
Use it when: you have a stable, high-volume design and the tooling cost is justified. It is poorly suited to prototyping, frequent design changes, or the most intricate burr-free features.
CNC machining
CNC machining removes material with cutting tools under computer control. It is useful for thicker, three-dimensional parts and tight tolerances, but it is subtractive point-by-point, so it is slower and more costly for thin, intricate, flat parts, and can introduce mechanical stress and burrs.
Use it when: parts are thicker or three-dimensional and need machined tolerances. For thin, flat, fine-featured components, etching is usually faster and cleaner.
how to choose
- Choose photochemical etching for thin, intricate, burr-free, stress-free, fine-featured parts, and when you want low tooling cost and fast design iteration from prototype to volume.
- Choose laser cutting for quick individual profiles where a heat-affected edge is acceptable.
- Choose stamping for stable, very-high-volume designs that justify hard tooling.
- Choose CNC machining for thicker or three-dimensional parts needing machined tolerances.
related
Explore Tecan’s photochemical etching capability and example components, including EMI/RFI shielding, etched meshes and sieves, heat exchangers and bipolar fuel cell plates.