Laser cutting tolerances — what to expect
A fiber laser achieves tolerances of ±0.1 mm on most materials. We explain what affects tolerances and how to design parts with manufacturing deviations in mind.
Tolerance is the allowable deviation from a nominal dimension. With fiber laser cutting, we typically achieve ±0.1 mm — which is more than sufficient for most mechanical engineering applications.
What affects tolerance
- Material thickness — thin sheet cuts more precisely than thick
- Material type — stainless steel and aluminum react differently to heat
- Part geometry — small holes and sharp corners are more challenging
- Machine calibration — regular maintenance is key
Cut width (kerf)
The laser does not cut along a zero-width line — it vaporizes material to a width of approximately 0.1–0.3 mm (the kerf). For precise part fitting, this offset must be accounted for in the CAD model. Our calculator does this automatically.
When tolerance is not enough
For applications requiring tolerances below ±0.05 mm (precision bearing seats, press fits), post-laser machining is necessary — milling or grinding of mating surfaces.
Conclusion
A tolerance of ±0.1 mm covers 95% of standard mechanical engineering applications. For critical dimensions, always specify the required tolerance directly in the drawing or in the order notes.
