Circularity Test; Circularity Test: Function - Siemens SINUMERIK 840D sl Commissioning Manual

Drive tuning

10.7 Circularity test

10.7 Circularity test
10.7.1

Circularity test: Function

Benefits
The circularity test serves to set and assess the dynamic response for interpolating axes and
to analyze the contour accuracy on the quadrant transitions (circular contours) achieved by
means of friction compensation. The circularity test is used to check the interpolation of the
axes which work together. This function measures a circle with reference to the motor or to the
direct measuring system. Alignment of the machine-mechanical equipment is not taken into
account in the result. This gives the commissioning engineer the option of separating problems
with the controller tuning from mechanical problems.
The following axis machine data and parameters are checked with this procedure:
● MD32200, MD32400, MD32402, MD32410, MD32490, MD32500, MD32510, MD32520,
MD32540 MD32620, MD32640, MD32810, MD32900, MD32910, MD32930, MD32940
● p1421 bis p1426, p1400, p1433, p1434
The following compensations should be disabled if this procedure is carried out:
● MD32450 backlash compensation
● MD32500 friction compensation
● MD32700 leadscrew error compensation
● MD32710 Enable sag compensation
● MD32750 Temperature compensation type
Note
MD32450 $MA_BACKLASH: Backlash compensation must be adjusted using an external
device, such as a circularity test or gauge.
Example of an NC program to dimension X-Y axes:
FFWON
SOFT
G90 G01 F3000 X400 Y200 Z500
LAB:
G91 G64 G02 X0 Z0 I10
GOTOB LAB
M30
Position, feedrate and active plane must be adjusted to the machine! Alternatively, you can
generate a program using a softkey.
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA