CNC CNC Lathe Turning Operations 2

Question 1

Which G-code cancels canned cycle operation on a CNC lathe?

Accepted Answer

G80

Answer

G80 cancels any active canned cycle, returning the lathe to normal operation mode.

Question 2

What does the term 'chatter' describe in CNC lathe turning?

Accepted Answer

Vibration causing poor surface finish

Answer

Chatter is a resonant vibration between the cutting tool and workpiece that produces a poor, wavy surface finish.

Question 3

When turning a taper using the compound rest method, the compound is set to:

Accepted Answer

Half the included angle

Answer

The compound rest is swiveled to half the included taper angle because it moves along one side of the taper.

Question 4

In G-code, the M03 command with an S-word sets the spindle to:

Accepted Answer

Forward rotation at specified RPM

Answer

M03 starts the spindle in the forward (clockwise) direction at the RPM specified by the S-word.

Question 5

What is the purpose of a steady rest in CNC lathe operations?

Accepted Answer

To support long slender workpieces during turning

Answer

A steady rest supports long, slender workpieces midspan to prevent deflection and vibration during turning.

(CNC) Computer Numerical Control Machinist Technical Practice Test