How do I keep a laser-cutting file at the correct size?

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Set document units deliberately, draw at full physical size when the workflow expects 1:1 geometry, and include at least one known dimension that can be…

Set document units deliberately, draw at full physical size when the workflow expects 1:1 geometry, and include at least one known dimension that can be checked after import. Size can change between programs: LightBurn, for example, can import an SVG at 96 or 72 DPI, and a DXF with no units in the file may import at the wrong scale. In an SVG, the viewBox also shifts and scales the content, as the SVG standard defines it. Three checks that keep a laser file at the correct size Three cards side by side and a warning bar. Card one, document units, shows a panel asking in or mm with a tick ruler below, and says set on purpose because conversions can resize. Card two, a known dimension, shows a rectangle with a dimension line marked L underneath, and says to check that one length after import. Card three, a 1:1 check, shows a dashed outline sitting exactly on a ruler with a check mark, and says to print at 100 percent and compare with a ruler. A warning bar below says never drag until it looks right; fix the unit or export at its source. 1. Document units set on purpose conversions can resize 2. A known dimension one length to check check it after import 3. A 1:1 check compare with a ruler print at 100 percent in or mm? L Never drag until it looks right. Fix the unit or export at its source. Do all three before you load material. The known dimension is drawn as the letter L because it is whatever length your design specifies. Fit-critical work earns the physical ruler check; for other work, the software measuring tool may be enough. Before approval, measure the imported geometry with the laser software’s tool and compare it with the design specification. For fit-critical work, print the outline at 100 percent or compare it with a physical ruler or reference object before using material. Never correct scale by dragging until it looks right; record the intended dimensions and correct the unit or export problem at its source.

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