TL;DR
Use a clean, dry taper cleaner; never compressed air alone. Wipe with a lint-free cloth, run a runout check, then re-tool.
What you might see
- poor surface finish
- tool runout
- spindle taper grime
Likely causes
Coolant residue inside the taper
Chip buildup from heavy cuts
Worn spindle taper
Required tools
- Spindle taper cleaner
- Lint-free cloth
- Precision test bar
- 0.0001" dial indicator
Safety first
- Engage E-stop before reaching into the spindle area.
Procedure
- 1
Power down the spindle and engage E-stop.
- 2
Insert a dry spindle taper cleaner and rotate by hand.
- 3
Wipe the taper with a clean lint-free cloth.
- 4
Mount a precision test bar and check runout with a dial indicator.
- 5
If runout exceeds the spec in the operator's manual, contact your DMG MORI service rep.
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