CNC Machine 4

Question 1

What is the function of a through-spindle coolant (TSC) system on a CNC machining center?

Accepted Answer

To deliver coolant directly through the tool to the cutting edge

Answer

TSC channels high-pressure coolant through the spindle and tool body to the cutting zone, improving chip evacuation and heat removal in deep-hole or difficult-to-reach areas.

Question 2

On a CNC machine, what does 'G28' command the machine to do?

Accepted Answer

Return all axes to the machine home (reference) position

Answer

G28 is the return-to-reference-point command that moves all programmed axes to the machine's home (zero) position.

Question 3

What is the purpose of a CNC machine's pallet changer?

Accepted Answer

To allow one pallet to be loaded/unloaded while another is being machined

Answer

A pallet changer improves machine utilization by letting an operator set up the next workpiece on one pallet while the machine cuts the current one.

Question 4

Which axis is typically defined as the axis of rotation of the main spindle in CNC programming standards?

Accepted Answer

Z-axis

Answer

By EIA/ISO convention, the Z-axis is always parallel to the principal spindle axis of rotation in CNC machine tool programming.

Question 5

What causes 'stick-slip' in older CNC machine slideways, and how is it typically corrected?

Accepted Answer

Insufficient lubrication causing jerky motion at low feeds; corrected with proper way oil

Answer

Stick-slip occurs when dry or poorly lubricated slideways alternate between static and kinetic friction, causing jerky motion especially at slow feed rates.

CNC - Cutting Practice Test

CNC - Cutting Practice Test

CNC Machine 4