Automatic Tool Change Door Milling: A 120-Stile Time Budget
Three automated tool changes per stile save a modeled 33 seconds each cycle, or 66 minutes across 120 stiles under the stated routing.
This application example uses public references and explicitly stated planning inputs. Figures derived from assumptions are estimates for evaluation, not measured customer results.
Production question
How much unattended time can an automatic tool change recover in a four-operation door-stile route?
Worked calculation
Assume three changes per stile, each taking 16 seconds manually or 5 seconds automatically. The modeled saving is 3 × 11 = 33 seconds per stile, or 66 minutes over 120 stiles. If manual changes are batched across all stiles, the comparable saving is smaller.
How to validate it on the shop floor
Capture change-to-change time including homing, interlocks and spindle restart. Probe or verify tool lengths and check first and last pocket depths. Include the alternative’s extra part handling if it batches by operation.
What to do with the result
Compare manual change time with the real alternative, such as running every stile with tool one and then repeating the batch for tools two through four. That alternative adds staging and re-clamping but can reduce tool changes. For a fair comparison, include changeover after a broken cutter, tool length verification and the time from completed machining to a part ready for assembly.
Practical follow-up
Is the 66-minute difference total line savings? It covers the assumed in-cycle tool changes. Loading, inspection, fault recovery and downstream assembly need separate timing.