Refer to Mill - Tooling - Maintenance. Do the VMC - Spindle - Drawbar - Force Measurement.
Note: Best practice is to remove toolholders from the spindle when the machine is not in operation.
**The recommended times are based on the average user. Actual times vary depending on machine usage and the materials being cut. If you machine abrasive materials such as graphite or cast iron, or if you run the machine the machine on multiple shifts per day, the inspections should be more frequent. Likewise, if the machine is rarely used, then the intervals between inspections can be longer.