How kerf and end trim change a cutting plan
Kerf is the material removed by the blade. End trim reserves unusable material at the ends of a stock bar. Both must be included before a pattern can be called executable.
Updated: · Toreniva Cutwise technical reviewUse the same convention throughout the job
Cutwise accepts kerf in the same length unit as stock and demand. trimPerEnd applies to each end, so a value of 8 reserves 16 mm on every used stock bar. Keep drawing, machine and optimizer units aligned before comparing results.
Capacity check for one pattern
The exact kerf convention must match the solver and the shop procedure. Cutwise exposes the process parameters with the result so the plan can be checked rather than inferred later.
required length = sum(part lengths) + kerf allowance + (2 × trimPerEnd)
required length ≤ selected stock lengthWhy a few millimetres can change the optimum
Near a stock-length boundary, adding one more cut or reserving end trim can force a part onto another bar. That is why utilization should be compared only when the underlying kerf and trim assumptions are identical.
| Scenario | Reserved trim | Kerf | Consequence |
|---|---|---|---|
| Idealized | 0 mm | 0 mm | May fit a pattern that cannot be cut |
| Trim only | 16 mm per bar | 0 mm | Less net stock on every used bar |
| Production input | 16 mm per bar | 3 mm | Patterns and utilization reflect process loss |