HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 52)

40 3 Touch Probe Cycles for Automatic Workpiece Inspection
3.1 Measur
ing W
o
rk
piece Misalignment
U U U U Measuring height in the touch probe axis Q261
(absolute): coordinate of the ball tip center (= touch
point) in the touch probe axis in which the
measurement is to be made.
U U U U Setup clearance Q320 (incremental): additional
distance between measuring point and ball tip. Q320
is added to MP6140.
U U U U Clearance height Q260 (absolute): coordinate in the
touch probe axis at which no collision between tool
and workpiece (fixtures) can occur.
U U U U Traversing to clearance height Q301: definition of
how the touch probe is to move between the
measuring points:
0: Move at measuring height between measuring
points
1: Move at clearance height between measuring
points
U U U U Set to zero after alignment Q337: definition of
whether the TNC should set the display of the C-axis
to zero, or write the angular misalignment in column
C of the datum table:
0: Set display of C to 0
>0: Write the angular misalignment, including
algebraic sign, in the datum table. Line number =
value of Q337. If a C-axis shift is registered in the
datum table, the TNC adds the measured angular
misalignment.
Example: NC blocks
5 TCH PROBE 405 ROT IN C-AXIS
Q321=+50 ;CENTER IN 1ST AXIS
Q322=+50 ;CENTER IN 2ND AXIS
Q262=10 ;NOMINAL DIAMETER
Q325=+0 ;STARTING ANGLE
Q247=90 ;STEPPING ANGLE
Q261=-5 ;MEASURING HEIGHT
Q320=0 ;SET-UP CLEARANCE
Q260=+20 ;CLEARANCE HEIGHT
Q301=0 ;TRAVERSE TO CLEAR HEIGHT
Q337=0 ;SET TO ZERO
X
Z
Q261
Q260
MP6140
+
Q320