> For the complete documentation index, see [llms.txt](https://tworks-wiki.gitbook.io/cnc-3-axis-turn-mill/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tworks-wiki.gitbook.io/cnc-3-axis-turn-mill/cleaning-and-maintenance/annual-maintenance-by-authorized-maintenance-personnel-only.md).

# Annual maintenance (By authorized maintenance personnel only)

1 .  Check correct functioning of the emergency stop switch

2 .  Check all safety devices (correct functioning of light barriers, protective trip switch)

3 . The electrical cabinet should be checked during the annual maintenance performed on the MultiCam CNC machine

4 .  The belts on all transmissions and Lead Screw Z-nuts be replaced every other year.

5 . Operators should not use compressed air when cleaning out the cabinet as this action may cause unwanted particles to short out some of the electrical components.