G Code

G00

Rapid positioning.

G01

Linear interpolation.

G02

Clockwise circular interpolation.

G03

Counterclockwise circular interpolation.

G04

Dwell.

G18

X-Z plane selection.

G20

Inch programming.

G21

Metric programming.

G28

Return to machine reference.

G40

Cancel tool nose compensation.

G41

Tool nose compensation left.

G42

Tool nose compensation right.

G50

Maximum spindle speed / coordinate setting, depending on control.

G54–G59

Work coordinate systems.

G70

Finishing cycle.

G71

Longitudinal roughing cycle.

G72

Facing roughing cycle.

G73

Pattern repeating cycle.

G74

Face grooving / peck drilling cycle.

G75

OD/ID grooving cycle.

G76

Multiple-pass threading cycle.

G96

Constant surface speed.

G97

Constant RPM.

G98

Feed per minute.

G99

Feed per revolution.

What does the first-line U control?

Depth of cut in X.

What does R control?

Retract amount between passes.

What does P identify?

First profile block number.

What does Q identify?

Last profile block number.

What does second-line U control?

X finishing allowance.

What does W control?

Z finishing allowance.

Why would you leave finishing material on the part?

To ensure accuracy and avoid cutting too much material.

What happens if P and Q reference the wrong blocks?

It can lead to incorrect machining paths.

What is the purpose of G70?

To perform the finishing cycle.

What does P identify in G70?

First profile block.

What does Q identify in G70?

Last profile block.

Does G70 perform the roughing operation?

No, G70 is used for finishing.

Which cycle is commonly used before G70?

G71 or G72 for roughing.

What is the primary purpose of G72?

To perform a facing roughing cycle.

What does first-line W control in G72?

Depth of cut in Z.

What does second-line W control in G72?

Z finishing allowance.

How does G72 differ from G71?

G72 is for facing roughing while G71 is for longitudinal roughing.

What type of work is G73 best suited for?

Pattern repeating operations.

What does first-line U represent in G73?

X direction pattern offset.

What does first-line W represent in G73?

Z direction pattern offset.

What does R determine in G73?

Number of roughing passes.

How is G73 different from G71?

G73 focuses on repeating patterns while G71 is for longitudinal roughing.

What is the final X position in G74?

The final X position of the face grooving or peck drilling.

What is the peck amount in X in G74?

P.

What does Q control in G74?

Peck amount in Z.

What does G76 control in the first block?

Finish passes, chamfer amount, tool angle.

What does Q (first block) specify in G76?

Minimum depth of cut.

What does R (first block) specify in G76?

Finishing allowance.

What is the purpose of the M00 code?

Program stop.

What does the M02 code do?

Program end.

What does the M08 code control?

Coolant on.

What does the S command control?

Spindle speed.

What does the T command control?

Tool selection and offset.

What does the F command control?

Feed rate.

What does the X command control?

X-axis position.

What does the Z command control?

Z-axis position.