Gear Stages; Special Turning Functions; Constant Cutting Rate: G96, G97 - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

8.9.3

Gear stages

Functionality
Up to 5 gear stages can be configured for a spindle for speed / torque adaptation.
Programming
The relevant gear stage is selected in the program via M commands:
M40 ; Automatic gear stage selection
M41 to M45 ; Gear stages 1 to 5
8.10

Special turning functions

8.10.1

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...
G97
S
LIMS=
F
Remark:
If G94 instead of G95 was active before, a new appropriate F value must be written.
See the following illustration for 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.
92
; Constant cutting speed ON
; Constant cutting speed OFF
; Cutting rate, unit of measurement m/min.
; Upper limit speed of the spindle with G96, G97 effective
; Feedrate in mm/revolution - as for G95
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015