G94 Feed Per Minute – Understanding G-Code for Accurate CNC Machining

Feed Per Minute (G94)

G94 G-code is a modal G-code. G94 instructs the control to interpret feed commands as

• inches/minute or mm/minute for linear moves.
• degrees/minute for rotary moves.
• inches/minute or mm/minute for a combination of linear and rotary moves.

When a combination of linear and rotary moves is programmed, the rotary moves match the time it takes to make the linear moves.

The G94 function selects feed F in mm/min or inches/minute. When this function is active the feed values will be programmed as follows: F50, F150, F500, F2000 and so forth.

G94 (feed per minute) G-code is used to perform movements with work feed when the spindle is stationary, or when it is necessary to release the axis feed from the spindle revolutions (e.g.: when milling with motor driven tools or live tooling).

Related: Live tooling on Haas CNC lathe machine program examples

• C-Axis Lathe Programming Example with Live Tooling on Haas CNC
• Live Tooling Lathe Programming Code – Spindle Orientation Haas CNC

Related: G Code Lists

• Complete G Code List
• Fanuc G Codes List
• Haas CNC Lathe G-Codes

G94 (feed per minute) G-code is used to perform movements with work feed when the spindle is stationary

G94 is a modal function and can be cancelled by programming the code G95 (Feed Per Revolution).

N7 ……
N8 G94 ; mm/min feed
N9 G1 X… Z… F400
N10 ……
N11 ……
N12 G95 ; mm/rev feed
N13 G1 X… Z… F0.12
N14 ……