CNC Basics 2

Question 1

What does the term 'feed rate' refer to in CNC cutting?

Accepted Answer

The rate at which the cutting tool advances into the workpiece

Answer

Feed rate is the speed at which the cutting tool moves relative to the workpiece, typically expressed in inches per minute (IPM) or millimeters per minute.

Question 2

Which G-code command is used to set absolute positioning mode in CNC programming?

Accepted Answer

G90

Answer

G90 sets the machine to absolute positioning mode, where all coordinates are measured from the origin (work zero).

Question 3

What is the purpose of a coolant in CNC cutting operations?

Accepted Answer

To reduce heat, lubricate the cut, and flush away chips

Answer

Coolant simultaneously reduces cutting heat, lubricates the tool-workpiece interface, and evacuates chips from the cutting zone.

Question 4

What is 'climb milling' in CNC machining?

Accepted Answer

The cutter rotates in the same direction as the feed

Answer

In climb milling, the cutter rotates in the same direction as the workpiece feed, which tends to produce a better surface finish and longer tool life.

Question 5

What unit is spindle speed (RPM) typically calculated from when setting up a CNC cut?

Accepted Answer

Cutting speed (SFM or m/min) and tool diameter

Answer

RPM is derived from the recommended cutting speed (surface feet per minute) and the tool diameter using the formula RPM = (CS × 12) / (π × D).

CNC - Cutting Practice Test

CNC - Cutting Practice Test

CNC Basics 2