Measurement Of A Shaft (Measurement Type 9) - Siemens SINUMERIK 840D sl Function Manual

M5: Measuring
8.4 Setting zeros, workpiece measuring and tool measuring
8.4.3.4

Measurement of a shaft (measurement type 9)

Measuring points for determining a shaft ($AC_MEAS_TYPE = 9)
Three measuring points are needed to determine the center point and diameter. The three
points must all be different. When four points are specified, the circle is adjusted in
accordance with the least square method. The circle is determined so that the sum of the
distance squares of the points to the circle is minimal. The quality of the adjustment can be
read.
Figure 8-10 Shaft
The values of the following variables are evaluated for measurement type 9:
Input variable
$AC_MEAS_VALID
$AA_MEAS_POINT1[axis]
$AA_MEAS_POINT2[axis]
$AA_MEAS_POINT3[axis]
$AA_MEAS_POINT4[axis]
$AA_MEAS_SETPOINT[axis]
$AC_MEAS_ACT_PLANE
$AC_MEAS_FINE_TRANS
$AC_MEAS_FRAME_SELECT
$AC_MEAS_T_NUMBER
$AC_MEAS_D_NUMBER
$AC_MEAS_TYPE
* optional
640
Meaning
Validity bits for input variables
Measuring point 1
Measuring point 2
Measuring point 3
When specified, the center is determined from four points *
Setpoint position of shaft center point *
Calculated as active plane unless otherwise specified *
0: Coarse offset, 1: Fine offset *
Calculated as additive frame unless otherwise specified *
Calculated as active T unless otherwise specified (T0) *
Calculated as active D unless otherwise specified (D0) *
9
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions