Programmable Contour Accuracy - Siemens SINUMERIK 840D sl Function Manual

K6: Contour tunnel monitoring
4.1 Brief description
Example
The following figure is a diagram of the monitoring area shown by way of a simple example.
Figure 4-1
As long as the calculated actual position of the tool tip remains inside the sketched tunnel,
motion continues in the normal way. If the calculated actual position violates the tunnel, an
alarm is triggered (in the default setting) and the axes are stopped by "Ramp Stop". This
response to the violation of the tunnel can be disabled (alarm triggered but movement
continued) or intensified (rapid stop) by means of a machine data setting.
Analysis
The calculated distance between the programmed path and the actual values can be routed
to an analog output to analyze the progression of the contour errors during normal operation
(quality control).
4.1.2

Programmable contour accuracy

Function
As an alternative to the function described in "Contour tunnel monitoring", i.e. monitoring of
the machining accuracy and stopping machining if excessive deviations occur, another function
is offered. With this function, the selected accuracy is always achieved with the path velocity
being reduced if necessary. Detailed information about this function can be found under the
subject "Programmable contour accuracy".
178
Position of the contour tunnel around the programmed path
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions