Programming
10.5 Special functions
Cylindrical grinding
Programming and Operating Manual, 07/2009, 6FC5398-4CP10-2BA0
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10.5 Special functions
10.5.1 Constant cutting rate: G96, G97
Requirement
A controlled spindle must be present.
Functionality
With activated G96 function, the spindle speed is adapted to the currently machined
workpiece diameter (transverse axis) such that a programmed cutting rate S remains
constant on the tool edge:
Spindle speed times diameter = constant.
The S word is evaluated as the cutting rate as of the block with G96. G96 is modally effective
until cancellation by another G function of the group (G94, G95, G97).
Programming
G96 S... LIMS=... F... ; Constant cutting speed ON
G97 ; Constant cutting speed OFF
S ; Cutting rate in m/min.
LIMS= ; Upper limit speed of the spindle with G96, G97
effective
F ; feedrate in mm/revolution –as for G95
Remark:
If G94 instead of G95 was active before, a new appropriate F value must be written!
Rapid traverse
With rapid traverse G0, there is no change in speed.
Exception: If the contour is approached at rapid traverse and the next block contains an
interpolation type G1 or G2, G3, CIP, CT (contour block), then the speed for the contour
block is applied already in the approach block with G0.
Upper speed limit LIMS=
During machining from large to small diameters, the spindle speed can increase significantly.
In this case, it is recommended the upper spindle speed limitation LIMS=... . LIMS is only
effective with G96 and G97.
By programming LIMS=..., the value entered into the setting data (SD 43230:
SPIND_MAX_VELO_LIMS) is overwritten. This SD takes effect when LIMS is not written.
The upper limit speed programmed with G26 or defined via machine data cannot be
overwritten with LIMS=.
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