Geometry Monitoring - Siemens SINUMERIK 840D sl Function Manual

18.5.2

Geometry monitoring

Function
The following quantities can be monitored:
● The current grinding wheel radius
● The current grinding wheel width
The current wheel radius is compared with the value stored in parameter $TC_TPG3.
The current radius is compared with the parameter number of the first edge (D1) of a
grinding tool declared in parameter $TC_TPG9.
The current wheel width is generally calculated by the dressing cycle and can be entered in
parameter $TC_TPG5 of a grinding tool. The value entered in this parameter is compared to
the value stored in parameter $TC_TPG4 when the monitoring function is active.
When does monitoring take place?
The monitoring function for the grinding wheel radius remains active when an online tool
offset is selected:
● when the monitoring function is activated
● when the current radius (online tool offset, wear parameter) or the current width
Monitor reactions
If the current grinding wheel radius becomes smaller than the value stored in parameter
$TC_TPG3 or the current grinding wheel width ($TC_TPG5) drops below the value defined
in $TC_TPG4, the axis/spindle-specific bit DBX83.3 is set to "1" in DB31, ... at the PLC
interface.
This bit is otherwise set to "0".
DB31, ... DBX83.3 = 1 ⇒ Geometry monitoring has responded
DB31, ... DBX83.3 = 0 ⇒ Geometry monitoring has not responded
Note
No error reaction is initiated internally in the control system.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
and
($TC_TPG5) is altered
Grinding-specific tool offset and tool monitoring (W4)
18.5 Grinding-specific tool monitoring
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