Siemens SINUMERIK 840D sl Function Manual page 664

Measurement (M5)
Setting zeros, workpiece measuring and tool measuring
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,
● the 1st measuring point P1 is applied as the new WCS' reference point,
● the 2nd measuring point P2 defines the direction of the abscissa x' of the newly rotated
● the 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
The following output variables are written for measurement type 18:
Output variable
$AC_MEAS_FRAME
$AC_MEAS_RESULTS[0]
$AC_MEAS_RESULTS[1]
$AC_MEAS_RESULTS[2]
664
WCS' coordinate system and
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
Description
Result frame with rotations and transformation
Calculated angle around the abscissa
Calculated angle around the ordinate
Calculated angle around the applicate
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions