CNC Programming & Machine Operation 2

Question 1

What does the CNC G02 code command the machine to do?

Accepted Answer

Perform a clockwise circular interpolation

Answer

G02 commands the machine to move in a clockwise arc, while G03 commands counterclockwise arc motion.

Question 2

In CNC programming, what is the purpose of the I and J address words used with G02/G03?

Accepted Answer

They define the incremental distance from the arc start to the arc center

Answer

I and J are incremental offsets from the arc start point to the arc center in the X and Y axes respectively.

Question 3

Which modal group do G00 and G01 belong to, and what does this mean?

Accepted Answer

Group 1; only one code from the group can be active at a time

Answer

G00 and G01 are both in modal Group 1 (motion group), so activating one cancels the other.

Question 4

A CNC operator needs to drill 10 holes using a canned cycle. Which code initiates a standard drilling canned cycle?

Accepted Answer

G81

Answer

G81 is the standard drilling canned cycle that plunges to depth and retracts at rapid speed.

Question 5

What is the function of G83 in CNC machining?

Accepted Answer

Peck drilling cycle that retracts fully to clear chips

Answer

G83 is a peck drilling cycle that fully retracts to the R plane between pecks to clear chips from deep holes.

(CNC) Computer Numerical Control Machinist Technical Practice Test