Specifications

_____________________________________________________________________
_____________________________________________________________________
CONCISE GUIDE FANUC 34
A block containing G96 is programmed:
N4 ……
N5 G96 S150 M4
N6 ……
Where:
• G96 => Spindle speed set Vt [m/min]
• S150 => Cutting speed Vt [m/min]
• M4 => Spindle direction of rotation
3.10 “G92” SPINDLE REVOLUTION LIMITATIONS
Using the constant cutting speed (function G96) it is often necessary for technical reasons and safety
(type of collet chuck, size of workpiece, unbalancing, etc.), to set a limit to the spindle maximum rpm. For
example when facing or parting off, up to the centre of the workpiece the spindle speed tends to reach an
infinite value. Programming “G92 S2500” the spindle rotates with a constant cutting speed without,
however, exceeding the threshold of 2500 rpm.
Example:
N2 ……
N3 T404
N4 G92 S2000 ; spindle revolutions limited to a maximum of 2000
N5 G96 S150 M4
N6 G0 X100 Z3 M8
N7 ……
The limit set by G92 remains active until it is modified by a new setting of the same function, or it can be
deactivated by programming “G92 S0”.
Programming G97 (fixed revs) the spindle speed limit set with G92 active is deactivated, if there is a new
programming of G96 the spindle speed limit becomes active again.
At power on, if no value is specified for G92 S the spindle rotation speed will not be limited.