What edge profiles are standard for INNOETCH’s etched precision shims?

INNOETCH’s etched precision shims are typically supplied with a standard burr-free etched edge profile produced by the photochemical etching process. This is the default edge condition for custom etched shims because chemical etching removes material uniformly through a patterned mask, without the mechanical shearing, punching stress, or raised burr formation common to stamping and conventional blanking. The standard etched edge is not a mechanically broken edge or a secondary deburred edge in the conventional sense. Instead, the edge character is determined by the etching process, material thickness, etch direction, opening geometry, and production controls. In practical terms, buyers and engineers can expect an edge that is suitable for precision spacing, alignment, assembly support, and thin-metal adjustment applications where burrs and mechanical deformation would interfere with fit, stack-up, or surface contact. This is especially relevant for shims used in electronics, semiconductor equipment, optical systems, automotive electronics, precision machinery, medical devices, and industrial assemblies. For shim drawings, the most important edge-related information to define is the required perimeter shape, internal feature geometry, material, thickness, tolerance class, and any functional edge requirement. Standard etched shim edges can be produced for simple round or rectangular shims, slotted shims, tabbed shims, segmented shims, laminated-style flat shims, and custom adjustment plates. Because photochemical etching does not rely on hard tooling for each profile, edge geometry can be revised during prototype development without the same tooling constraints found in stamping. This makes the process useful when shim designs include fine slots, dense hole patterns, stepped features, or irregular outlines. INNOETCH controls edge quality as part of its quality management and inspection scope, which covers dimensions, tolerances, surfaces, edge quality, flatness, and production consistency from sample builds through mass production. When reviewing a shim design, engineering should note whether the part will be used in contact with sensitive assemblies, dynamic components, sealing surfaces, optical paths, or electronic components, because these applications can affect how edge smoothness, feature position, and flatness should be specified. If a drawing calls for a special edge condition, that requirement should be stated explicitly rather than assumed from general shim notes. Material selection also affects edge profile behavior. INNOETCH manufactures precision shims in stainless steel, copper, nickel, molybdenum, aluminum, and other etchable metals. Thinner materials generally produce very fine, clean etched edges, while thicker materials require closer review of feature aspect ratio, wall definition, and opening geometry. For this reason, drawings should clearly identify nominal thickness, material temper where relevant, and any flatness or surface protection requirements. If a shim is intended for elastic or spring-like function, edge condition should be reviewed together with material choice and feature layout to avoid stress concentrations at narrow slots or corners. When requesting quotation or sample evaluation, buyers should provide 2D drawings with feature dimensions, material specification, thickness, tolerance requirements, quantity estimate, and application notes. If edge quality is functionally critical, it is helpful to mark the critical edges or note assembly conditions such as sliding contact, visual appearance needs, mating surface contact, or automated handling requirements. This allows the engineering review to confirm whether the standard etched edge is appropriate or whether additional process controls should be applied to specific features. For project review, drawings, material specifications, dimensions, tolerances, quantity and application requirements can be sent to nico@innoetch.com.