Machine Safety Flashcards

What is the primary purpose of a CNC machine's E-stop (emergency stop) button?

Answer: Immediately cut all machine motion and spindle power

The E-stop immediately cuts power to all motion axes and the spindle to halt the machine in a dangerous situation.

When should a CNC operator check the workpiece clamping before running a program?

Answer: Before every new program run

Clamping must be verified before every program run to prevent workpiece ejection during cutting.

Which type of CNC guard is designed to stop chips and coolant from exiting the machining envelope?

Answer: Full enclosure splash guard

Full enclosure splash guards contain chips, coolant, and any ejected debris within the machine's work envelope.

What should a CNC operator do if an unusual vibration or noise occurs during a cutting operation?

Answer: Stop the machine and investigate before restarting

Unusual vibration or noise can indicate tool breakage, poor fixturing, or machine faults, all of which require the machine to be stopped and inspected.

Why is it dangerous to wear gloves when operating a CNC lathe with rotating workpieces?

Answer: Gloves can catch on the rotating chuck and pull the hand in

Loose gloves can snag on a spinning chuck or workpiece and pull the operator's hand into the machine.

What is the correct action when loading a new tool into a CNC machining center?

Answer: Use the machine's tool-change cycle and verify tool length offset afterward

Tools should be loaded using the machine's tool-change procedure, then verified with a length offset measurement before cutting.

Which PPE is considered mandatory for all personnel inside a CNC machining area?

Answer: Safety glasses or goggles at minimum

OSHA and industry standards require eye protection as the minimum mandatory PPE in any machining area to guard against flying chips and coolant.