Programmable Spindle Speed Limitation (G25, G26) - Siemens SINUMERIK 840Di sl Programming Manual

Tool-specific parameters
In order to activate the function "Constant peripheral speed", the tool-specific grinding data
$TC_TPG1, $TC_TPG8 and $TC_TPG9 must be set accordingly. When the GWPS function
is active, even online offset values (= wear parameters; cf. "Grinding-specific tool monitoring
in the parts program TMON, TMOF" or PUTFTOC, PUTFTOCF) must be taken into account
when changing speed.
Select GWPS: GWPSON, program GWPS
After selecting the GWPS with GWPSON, each subsequent S value for this spindle is
interpreted as a grinding wheel peripheral speed.
Selection of grinding wheel peripheral speed with GWPSON does not cause the automatic
activation of tool length compensation or tool monitoring.
The GWPS can be active for several spindles on a channel with different tool numbers.
If GWPS is to be selected for a new tool on a spindle where GWPS is already active, the
active GWPS must first be deselected with GWPSOF.
Deactivate GWPS GWPSOF
When GWPS is deselected with GWPSOF, the last speed to be calculated remains valid as
the setpoint.
GWPS programming is reset at the end of the parts program or on RESET.
Query active GWPS $P_GWPS[spindle no.]
This system variable can be used to query from the parts program whether the GWPS is
active for a specific spindle.
TRUE: GWPS active.
FALSE: GWPS is inactive.
7.13

Programmable spindle speed limitation (G25, G26)

Function
You can use a command in the NC program to change the minimum and maximum spindle
speeds defined in the machine data and setting data. It is possible to program spindle speed
limitations for all spindles on the channel.
Programming
G25 S... S1=... S2=...
Or
G26 S... S1=... S2=...
A maximum of three spindle speed limitations can be programmed for each block.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Feedrate Control and Spindle Motion
7.13 Programmable spindle speed limitation (G25, G26)
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