Programming principles
1.5 Special turning functions
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
65
1.5 Special turning functions
1.5.1 Constant cutting rate: G96, G97
Functionality
Requirement: A controlled spindle must be present.
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, unit of measurement 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!
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Figure 1-30 Constant cutting rate G96
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.
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