Siemens SINUMERIK 828D Programming Manual page 108

Spindle motion
6.4 Constant grinding wheel peripheral speed (GWPSON, GWPSOF)
Example
A constant grinding wheel peripheral speed is to be used for grinding tools T1 and T5.
T1 is the active tool.
Program code
N20 T1 D1
N25 S1=1000 M1=3
N30 S2=1500 M2=3
...
N40 GWPSON
N45 S1=60
...
N50 GWPSON(5)
N55 S2=40
...
N60 GWPSOF
N65 GWPSOF(5)
Further information
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, programming 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 is active.
FALSE: GWPS is inactive.
108
Comment
; Select T1 and D1.
; 1000 rpm for spindle 1
; 1500 rpm for spindle 2
; Selection of GWPS for active tool.
; Set GWPS to 60 m/s for active tool.
; GWPS selection for tool 5 (spindle 2).
; Set GWPS to 40 m/s for spindle 2.
; Deactivate GWPS for active tool.
; Deactivate GWPS for tool 5 (spindle 2).
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals