CNC G-Code & M-Code Programming 3

Question 1

What G-code is used to set the tool length offset?

Accepted Answer

G43

Answer

G43 applies a positive tool length offset from the H-word register to compensate for tool length differences.

Question 2

In a CNC program block 'G02 X2.0 Y0.0 I1.0 J0.0', what do I and J represent?

Accepted Answer

Arc center offsets from the start point

Answer

I and J define the distance and direction from the arc start point to the arc center in the X and Y axes respectively.

Question 3

Which M-code activates flood coolant?

Accepted Answer

M08

Answer

M08 turns on flood coolant, which delivers a high volume of liquid coolant to the cutting zone.

Question 4

What is a 'canned cycle' in CNC programming?

Accepted Answer

A pre-programmed multi-step operation called with a single G-code

Answer

Canned cycles (G73–G89) are built-in multi-step routines like drilling, tapping, and boring activated by a single G-code block.

Question 5

What does a negative I or J value indicate in arc programming?

Accepted Answer

The arc center is in the negative direction from the start point

Answer

Negative I or J values mean the arc center is located in the negative X or Y direction relative to the arc's starting point.

(CNC) Computer Numerical Control Machinist Technical Practice Test