Siemens SINUMERIK 840D sl Function Manual page 653

Transformation of measuring frame
The results of the calculation, i.e. the solid angles and translation, are entered in measuring
frame $AC_MEAS_FRAME. The measuring frame is transformed according to the selected
frame in the frame chain. The solid angles are also stored in the output values
$AC_MEAS_RESULTS[0..2]. In
● The angle around the abscissa of the old WCS is stored in $AC_MEAS_RESULTS[0],
● The angle around the ordinate is stored in $AC_MEAS_RESULTS[1] and
● The angle around the applicate is stored in $AC_MEAS_RESULTS[2].
Define the new WCS' zero
After performing the calculation, the measuring cycle can write and activate the selected
frame in the frame chain with the measuring frame. After activation, the new WCS is
positioned at surface normal on the inclined plane, with measuring point P1 as the zero point
of the new WCS.
The programmed positions then refer to the inclined plane.
Application
CAD systems often define inclined planes by specifying three points P1, P2 and P3 on this
plane. In this case,
● 1st measuring point P1 is applied as the new WCS' reference point,
● 2nd measuring point P2 defines the direction of the abscissa x' of the newly rotated WCS'
● 3rd measuring point P3 is used to determine the solid angles.
The values of the following variables are evaluated for measurement type 18:
Input variable
$AC_MEAS_VALID
$AA_MEAS_POINT1[axis]
$AA_MEAS_POINT2[axis]
$AA_MEAS_POINT3[axis]
$AA_MEAS_SETPOINT[axis]
$AC_MEAS_ACT_PLANE
$AC_MEAS_FRAME_SELECT
$AC_MEAS_T_NUMBER
$AC_MEAS_D_NUMBER
$AC_MEAS_INPUT[0]
$AC_MEAS_TYPE
* optional
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
coordinate system and the
8.4 Setting zeros, workpiece measuring and tool measuring
Description
Validity bits for input variables
Measuring point 1
Measuring point 2
Measuring point 3
Setpoint position of P1 *
Calculated as active plane unless otherwise specified *
Calculated as additive frame unless otherwise specified *
Calculated as active T unless otherwise specified (T0) *
Calculated as active D unless otherwise specified (D0) *
Unless otherwise specified,
the points are not projected in a plane *
0: Points are not projected on a plane
1: Points are projected in the active plane or in the selected
plane
18
M5: Measuring
653