Constant cutting speed at feedrate per revolution (G96, G95)

When combined with the functions G96 and G95, a constant chip thickness and constant cutting speed (*) are obtained. The path feed is adapted to the spindle speed. When face turning, the following path speed curve results depending on the X position (turning radius). The path feed increases towards the turning centre point.

(*) Provided the dynamics of the spindle and path do not result in limiting effects.

Path feed for G96 at G95
Path feed for G96 at G95

Programing Example

prg_example

Constant cutting speed at feedrate per revolution

; X... Face turning axis

N10 M03 S2000 G01 X60 Z100 F1500

N20 G196 S2500        ;max. Speed 2500 1/min

N25 G95 F1.5        ;feedrate per revolution 1.5mm/rev

N30 G96 S100          ;const. cutting speed 100m/min

N40 Z49

N50 X10

N60 G00 Z50

N70     X60           ;rapid traverse: speed remains constant

N80     Z48

N90 G01 X10           ;suppress G96 cancelled

N100 G97              ;Deselect const. cutting speed

N110 G94              ;deselect feedrate per revolution

N120 M30