interview question on HMC

For a job interview for machine shop maintenance, we should know regarding CNC machines , its problem troubleshooting etc.
In HMC (Horizontal machining centers) machines we have a better access of most of the faces of job/component for operation.
These machines come in small to big sizes based on the part need to machined.
These are the basic parts of where interviewer can ask question
1) ATC - Automatic tool changer
2) APC- Automatic pallet changer
3) Through coolant
4) Spindle
5) Tools
6) Index table/ rotary table
7) Rotary union
8) Servo motor
9) Ball screw & LM guidesways

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