Why should I see a used machine run under power?
Many faults only appear warm and moving. A test run exposes spindle, drive, changer and control problems.
Because many faults only show up when the machine is warm and moving. A machine that’s powered off, or only switched on for a minute, can hide expensive problems.
What a power-on test reveals
- Spindle noise, vibration or heat that grows with speed
- Axis drives that hesitate, alarm or overheat
- Tool changers that miss, bang or stall
- Hydraulic and lubrication systems that don’t hold pressure
- Control screens with failing displays or stuck buttons
A sensible test sequence
- Power up and home all axes
- Run a warm-up program for a while
- Run the spindle through its speed range
- Cycle the tool changer through every pocket
- Make a simple test cut and measure it
- Check the alarm history afterwards
When power isn’t available
At some auctions and closures, the machine can’t be powered up. Treat it as untested. Factor repair risk into your price, or walk away.
See the full inspection checklist.
Research a used machine tool before you buy it