CNC Machine Safety 3

Question 1

What does a 'door interlock' on a CNC machining center prevent?

Accepted Answer

The spindle from starting when the enclosure door is open

Answer

Door interlocks electrically prevent spindle rotation and axis motion when the enclosure door is open, protecting the operator.

Question 2

A CNC operator is performing a dry run (no material) to verify a new program. What is the safest practice?

Accepted Answer

Use single-block mode and reduced feed rate override

Answer

Single-block mode lets the operator review each line of code step by step, and a reduced feed override provides time to react to unexpected motion.

Question 3

When cleaning chips from a CNC machine, which tool should NEVER be used?

Accepted Answer

Compressed air blown directly at the work area without a guard

Answer

Using unguarded compressed air to blow chips can propel sharp metallic chips at high velocity, creating a serious eye and skin hazard for nearby workers.

Question 4

Which of the following best describes the purpose of a CNC machine's soft limits?

Accepted Answer

They are software boundaries that prevent axis travel beyond a safe range

Answer

Soft limits are programmable boundaries set in the CNC controller that stop axis motion before it reaches hard mechanical stops or causes a crash.

Question 5

What is the hazard associated with running a CNC machine with the coolant system disabled during metal cutting?

Accepted Answer

Excessive heat can cause tool failure, fire risk, and harmful metal fumes

Answer

Without coolant, heat buildup can cause tool breakage, workpiece fire risk with certain alloys, and release of hazardous metal particles and fumes.

CNC - Cutting Practice Test

CNC - Cutting Practice Test

CNC Machine Safety 3