CNC Machine Spindle Runout Axis Calibration Master Log
Use this master log to systematically record spindle runout measurements, verify axis calibration tolerances, and document any corrective actions. This form meets typical machining accuracy standards (ISO 230-1 / 10791-1) and supports repeatable quality assurance across all critical CNC assets.
This master log ensures that every production CNC machine receives periodic spindle runout checks and full three‑axis calibration verification. Documented measurements help detect early bearing wear, thermal drift, and collision damage. All inspections follow the manufacturer’s original geometric tolerances (typically ≤ 0.005 mm TIR for spindle nose, ≤ 0.020 mm/m for linear axes). The log also serves as an audit trail for ISO 9001 / AS9100 quality systems.
- Lockout/Tagout performed on machine electrical disconnect. Wait 5 min for spindle coast‑down before accessing taper.
- Safety glasses, hearing protection (if adjacent machines active). No loose jewelry or gloves near rotating components.
- Dial indicator (0.001 mm resolution) with magnetic base, test bar (ISO 7388/2), 500 mm precision straightedge, granite square, and calibrated feeler gauges.
Spindle & Axis Calibration Matrix
| Status (P/F) | Inspection Item / Task | Tolerance / Threshold | Actual Reading |
|---|---|---|---|
| [ ] P [ ] F | Spindle nose radial runout (TIR) – near taper | ≤ 0.004 mm (4 µm) | __________ mm |
| [ ] P [ ] F | Spindle nose axial runout (end face) | ≤ 0.005 mm | __________ mm |
| [ ] P [ ] F | Test bar runout @ 300 mm from spindle | ≤ 0.010 mm | __________ mm |
| [ ] P [ ] F | X‑axis backlash compensation | ≤ 0.012 mm (12 µm) | __________ mm |
| [ ] P [ ] F | Y‑axis straightness (vertical plane) over 400 mm | ≤ 0.015 mm | __________ mm |
| [ ] P [ ] F | Z‑axis squareness to X‑Y plane | ≤ 0.020 mm / 300 mm | __________ mm |
| [ ] P [ ] F | Table flatness (grade 1 granite square) | ≤ 0.025 mm over diagonal | __________ mm |
| [ ] P [ ] F | Spindle warm‑up run (15 min @ 6000 RPM) – vibration check | ≤ 1.5 mm/s RMS | __________ mm/s |
P = Pass (within tolerance), F = Fail (exceeds tolerance – enter in Corrective Action Log)
Defect / Corrective Action Log
| Date / Time | Item # | Issue Identified | Corrective Action Taken | WO # |
|---|---|---|---|---|
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
| ___/___/_____ | _______ | _______________________________ | _______________________________ | _______ |
By signing below, the inspector verifies that all items have been checked according to the manufacturer's specifications and facility safety standards. If any failures exist, corrective actions have been initiated.