The G95 command is used to set the feed rate mode to feed per revolution.

When G95 is active, the controller interprets feed rate values as distance travelled per spindle revolution, expressed as millimetres per revolution (mm/rev) or inches per revolution (in/rev), depending on the active unit system.

G95 is a modal command and belongs to Group 5.

Syntax & Parameters

The G95 command enables feed per revolution mode.

The F value specifies the distance travelled per spindle revolution and is used to calculate the resulting feed rate.

The S value specifies the spindle speed and is also used to calculate the resulting feed rate.

Example Program – Metric

N10 G21
N20 S800 M3
N30 G95
N40 G01 Z20 F0.1

In this example, the machine units are set to millimetres, and the spindle speed is set to 800 RPM.

The G95 command sets the feed rate mode to feed per revolution.

The final line moves the Z axis to Z20, advancing 0.1 mm for each spindle revolution.

The resulting feed rate is 80 millimetres per minute.

The feed rate is calculated using the following formula:

Spindle speed × Distance per revolution = Feed rate

In this example: 800 × 0.1 = 80 mm per minute

Example Program – Imperial

N10 G20
N20 S800 M3
N30 G95
N40 G01 Z2 F0.005

In this example, the machine units are set to inches, and the spindle speed is set to 800 RPM.

The G95 command sets the feed rate mode to feed per revolution.

The final line moves the Z axis to Z2, advancing 0.005 inches for each spindle revolution.

The resulting feed rate is 4 inches per minute.

The feed rate is calculated using the following formula:

Spindle speed × Distance per revolution = Feed rate

In this example: 800 × 0.005 = 4 inches per minute

Using G95 with G96

Using G95 together with G96 may cause unexpected results if used incorrectly.

When G95 is used with G96, an S value must be specified for G95 to function correctly.

The S value must be defined before the G96 command.

The S value specified as part of the G96 command is not used by G95.

The spindle speed calculated by G96 is not used by G95 when calculating the feed rate.