To design reliable laser-cut parts, account for the material removed by the beam, avoid holes and features that are too small for the chosen process, use tabs only where they can be removed or retained safely, and consider how heat may distort the part. These factors depend on material, thickness, cutting conditions, and machine setup, so treat general design rules as starting points—not guaranteed production limits. At Jinhui, we recommend confirming critical dimensions and fit requirements with your cutting supplier before releasing drawings.
This guide is for product designers, engineers, and procurement teams preparing sheet metal parts for laser cutting. It is particularly useful when a design includes close-fitting components, small holes, narrow webs, or parts that must remain attached to the sheet during processing. It can also help buyers provide clearer drawings and reduce avoidable clarification during quotation and production planning.
Laser cutting removes material along a programmed path, but the resulting part is affected by more than the CAD outline. Material grade, thickness, cutting parameters, geometry, and handling can all influence the finished edge and dimensions. A supplier review is valuable when a feature is critical to assembly or when the design has little tolerance for variation.
Kerf is the width of material removed as the laser travels through the sheet. If a cut follows a nominal CAD line without accounting for kerf, the finished edge will not occupy exactly the same position as that line. CAM software commonly applies a toolpath offset to account for this material removal, but the appropriate offset should be based on the cutting process and part requirements.
Kerf is not a universal constant. It can change with material type, thickness, focus, assist gas, machine condition, and cutting settings. For example, a hypothetical measured kerf of 0.20 mm would mean that the cut removes about that much material across the path; it is an illustration, not a specification for every laser or material.
Tell your supplier which dimensions are functionally critical, such as a mating edge or a slot width. Avoid applying a blanket offset to every CAD feature unless you control the CAM process and have verified the result. For parts that must fit together, ask the supplier to review both components as a matched set and confirm how the cutting path will be compensated.
When fit is especially sensitive, request a test coupon or a first-article review using the intended material and thickness. A sample can reveal whether a nominal slot, tab, or clearance needs adjustment before you commit to a larger quantity. Keep the drawing’s nominal dimensions and tolerances clear so the supplier can distinguish design intent from process compensation.
Small holes can be harder to cut consistently than larger openings because the beam has less space to travel and heat has less surrounding material over which to disperse. A frequently used preliminary rule is to avoid specifying a hole diameter smaller than the sheet thickness; for example, with a 3 mm-thick sheet, a 3 mm-diameter hole is a practical point to discuss with the supplier, not a guaranteed minimum. Material, tolerance, machine setup, and the hole’s purpose can change what is achievable.
If a hole is used for a fastener, locate and size it according to the actual assembly need, including clearance, coating, and any later finishing. If it is a pilot feature or a non-critical opening, you may have more design flexibility. Do not assume a laser-cut hole will behave exactly like a drilled or reamed hole when a close fit is required.
Narrow material between adjacent holes or between a hole and an outer edge can heat rapidly and may become fragile during cutting or handling. Review the smallest web width as well as the hole diameter, especially in thin or flexible parts. Where the feature is structurally important, consider increasing the spacing, adding a radius, or changing the geometry to distribute stress more evenly.
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Also check for stacked tolerances in patterns of holes. A part can meet an individual hole tolerance yet still create assembly difficulty if pitch, position, and mating-part tolerances accumulate. Mark datum references and identify the dimensions that govern assembly so the supplier can assess the complete feature pattern.
Tabs are small connections that keep a part attached to the surrounding sheet or skeleton during cutting. They can help prevent loose parts from shifting or dropping during processing, but they leave a connection point that may need to be broken, ground, or otherwise finished. Their use should therefore reflect both production handling and the appearance or fit required at the tab location.
Keep tabs away from sealing faces, visible edges, precision mating surfaces, and areas where a burr could interfere with assembly. If the tab is intended to remain, show that intent in the drawing and discuss how its edge will be finished. If it is temporary, identify acceptable locations and whether the remaining mark is permitted.
Tab width and quantity depend on part size, material, geometry, and handling requirements, so there is no universal value that suits every design. A supplier can advise whether tabs are needed and where they can be placed without compromising the part. Include a nest or part-orientation preference only when it is important to your functional or cosmetic requirements.
Laser cutting introduces localized heat. How much a part changes shape depends on material, thickness, cut sequence, geometry, restraint, and the distribution of heat across the sheet. Long, narrow strips, large open areas, and asymmetrical patterns can be more sensitive to movement than compact, balanced shapes, although the actual outcome must be assessed for the specific job.
Do not rely on a drawing note such as “no distortion” without defining what matters. State measurable requirements—for example, flatness, alignment, or an assembly check—and identify the inspection method if it is important to acceptance. Where a part must remain flat, discuss the material, thickness, geometry, support, and downstream operations with the supplier before finalizing the design.
Quotation and production timing depend on the part design, material availability, order quantity, and required finishing or inspection. Providing a complete drawing and clearly defined acceptance criteria helps a supplier assess the work more accurately. If a design is still flexible, ask for manufacturability feedback before locking in tolerances that may not be necessary for function.
As a custom metal laser-cutting supplier, Jinhui can review drawing details that affect manufacturability, including kerf compensation considerations, hole and slot geometry, tab placement, and distortion-sensitive features. The appropriate recommendation depends on your material, thickness, tolerances, quantity, and intended use. We avoid treating general rules of thumb as substitutes for project-specific review.
For a practical next step, send your part drawing with the material and thickness, required quantity, critical dimensions, and any fit or flatness requirements. Our team can discuss potential design considerations and clarify which features may need a sample or additional review. This helps you move from a CAD outline toward a part specification that is clearer for quotation and production.
Successful laser-cut design accounts for kerf, hole geometry, tabs, and heat distortion together—not as isolated details. Use supplier-confirmed process information for kerf and minimum features, place tabs where their removal or presence will not affect function, and define measurable requirements when flatness or fit matters. Before release, review the drawing against the checklist and validate critical features with a representative sample when needed.
If you are looking for more details, kindly visit Laser Cutting Design Guide: Kerf, Holes, Tabs, and Heat Distortion.