Grinding-Specific Tool Monitoring; Function - Siemens SINUMERIK 840D sl Function Manual

W4: Grinding-specific tool offset and tool monitoring

4.4 Grinding-specific tool monitoring

Boundary conditions
● A tool radius compensation, and thus also an online tool radius compensation, can be
activated only when the selected tool has a radius other than "0". This means that machining
operations cannot be implemented solely with a tool radius compensation.
● The online correction values should be low in comparison to the original radius to prevent
the permitted dynamic tolerance range from being exceeded when the offset is overlaid on
the axis movement.
● For grinding and turning tools (types 400 - 599), the correction value is applied as a function
of the cutting edge position, i.e. it acts as a radius compensation when tool radius
compensation is active and as a length compensation when tool radius compensation is
deactivated in the axes specified by the cutting edge position.
On all other tool types, the correction value is applied only when tool radius compensation
has been activated with G41 or G42. The correction value is canceled when tool radius
compensation is deactivated with G40.
4.4 Grinding-specific tool monitoring
4.4.1

Function

Grinding-specific tool monitoring is a combination of geometry and speed monitoring. It can be
activated for every grinding tool (tool type: 400 to 499).
Note
Monitoring of one tool is not deselected if the monitoring function is selected for another tool
provided the two tools are referred to different spindles.
One tool and thus also one tool monitor can be active for every spindle at any point in time.
Activated monitors remain active after a reset.
Geometry monitoring
The actual wheel radius and the actual wheel width are monitored.
The compensation value of the first cutting edge (D1) of a grinding tool which is referenced in
the parameter $TC_TPG9 is used as the current wheel radius. If monitoring is active, this value
is compared to the value in parameter $TC_TPG3 (minimum wheel radius).
Note
The monitoring function for the wheel radius remains active if an online tool offset is selected:
● when the monitoring function is activated
● when the current radius (online tool offset, wear parameter) or the current width
($TC_TPG5) is altered
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Function Manual, 06/2019, A5E47435126B AA
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