CNC Lathe Turning Operations Flashcards

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

Answer: G80

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

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

Answer: Vibration causing poor surface finish

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

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

Answer: Half the included angle

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

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

Answer: Forward rotation at specified RPM

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

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

Answer: To support long slender workpieces during turning

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

What does 'nose radius compensation' on an insert affect?

Answer: Actual part geometry when turning tapers and radii

Nose radius compensation (G41/G42) offsets the programmed path to account for the insert tip radius so tapers and profiles are cut accurately.

Which cutting condition most directly increases tool life when turning stainless steel?

Answer: Reducing cutting speed

Reducing cutting speed lowers heat generation at the tool-chip interface, which is the primary cause of rapid tool wear in stainless steel.