How to Calibrate Your CNC, Saw, and Waterjet — A Monthly Routine

The slab you scrapped last week probably wasn't a bad slab. It was a calibration drift you didn't catch in time. Here's the monthly routine our beta shops swear by.

Saw — weekly

Run a 4'×4' test cut at 0°, 45°, and 90°. Measure diagonals. If they're off by more than 0.5mm across 4', shim or call your service tech. Check blade flange torque every Friday — it loosens more than people think.

CNC — bi-weekly

Cut a 200mm calibration square in MDF, measure with a granite square. Re-home all three axes. Replace bridge wheels every 2,000 hours of cut time. Spindle runout above 0.05mm = call the manufacturer.

Waterjet — monthly

Replace mixing tube, check focus tube alignment, run a tear-out test on cardboard at 30k psi. Drift on the Z-axis is the silent killer — it eats abrasive efficiency by 15-20% before you notice.

Document everything

A calibration log isn't bureaucracy — it's how you spot a $40,000 spindle failure two weeks before it happens. Note any anomaly. Photo the wear. Track abrasive consumption per linear foot.

Stone fabricators are mechanics first, artists second. Treat your machines like an airline treats a 737 and your scrap rate halves.