5 Switching, Auxiliary and Miscellaneous Functions 05.91
5.3 Spindle function S
5.3 Spindle function S
The data below can optionally be entered under address S:
• Spindle speed in rev/min or 0.1 rev/min
1)
• Cutting speed in m/min or 0.1 m/min
1)
• Spindle speed limitation in rev/min or 0.1 rev/min
1)
• Spindle stop in degrees (M19)
• Spindle dwell in revolutions (see G04)
Several spindles can be selected with the extended address.
Note:
With spindles on a 32-bit servo CPU a wider speed range (address S) is available than on a
16-bit servo CPU providing higher resolution for oriented spindle stop (M19).
The extended address notation must be used and the spindle number specified for the S word:
e. g.
1000 rev/min
S2=1000
Spindle 2
Spindle speed limitation G92 S..
In certain circumstances it may be necessary to prevent the spindle speed from increasing fur-
ther (e.g. with constant cutting speed G96) and therefore to continue machining at a constant
speed from a certain point onwards. The speed limitation is programmed in rev/min under S in
a separate block before the program section in which the relevant machining operation is pro-
grammed. The G92 S... function can be written more than once in the program and is effective
only with G96.
Example:
N10 G92 S300
L
F
(spindle speed limited to 300 rev/min)
No further commands must be entered in a block containing G92. This restriction does not
apply to G94 and G95. An S word must always be programmed after G92.
Constant spindle speed limitation G26 S..
The speed monitor programmable under G26 S... is used as a workpiece or chuck-dependent
safety speed for the entire part program irrespective of the speed programming with G94 to
G97.
G26 S ... limits the setpoint speed and monitors the actual speed value.
______
1) The speed and cutting speed must be programmed in the same input format.
5–4 © Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02
SINUMERIK 880, (PG)
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