Cycle Parameters - HEIDENHAIN TNC 620 User Manual

14
Touch Probe Cycles: Automatic Datum Setting
14.6 DATUM FROM INSIDE OF CIRCLE (Cycle 412, DIN/ISO: G412)

Cycle parameters

Center in 1st axis Q321 (absolute): Center of the
pocket in the reference axis of the working plane.
Input range -99999.9999 to 99999.9999
Center in 2nd axis Q322 (absolute): Center of the
pocket in the minor axis of the working plane. If
you program Q322 = 0, the TNC aligns the hole
center to the positive Y axis. If you program Q322
not equal to 0, then the TNC aligns the hole center
to the nominal position. Input range -99999.9999 to
99999.9999
Nominal diameter Q262: Approximate diameter
of the circular pocket (or hole). Enter a value that
is more likely to be too small than too large. Input
range 0 to 99999.9999
Starting angle Q325 (absolute): Angle between the
reference axis of the working plane and the first
touch point. Input range -360.000 to 360.000
Stepping angle Q247 (incremental): Angle between
two measuring points. The algebraic sign of the
stepping angle determines the direction of rotation
(negative = clockwise) in which the touch probe
moves to the next measuring point. If you wish to
probe a circular arc instead of a complete circle,
then program the stepping angle to be less than
90°. Input range -120.000 to 120.000
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. Input range
-99999.9999 to 99999.9999
Set-up clearance Q320 (incremental): Additional
distance between measuring point and ball tip.
Q320 is added to SET_UP (touch probe table). Input
range 0 to 99999.9999
Clearance height Q260 (absolute): Coordinate in
the touch probe axis at which no collision between
touch probe and workpiece (fixtures) can occur.
Input range -99999.9999 to 99999.9999
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
Datum number in table Q305: Enter the number in
the datum/preset table in which the TNC is to save
the coordinates of the pocket center. If Q303=1: If
you enter Q305=0, the TNC automatically sets the
display so that the new datum is at the center of the
pocket. If Q303=0: If you enter Q305=0, the TNC
writes to line 0 of the datum table. Input range 0 to
99999
350
NC blocks
5 TCH PROBE 412 DATUM INSIDE
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
CIRCLE
Q321=+50 ;CENTER IN 1ST AXIS
Q322=+50 ;CENTER IN 2ND AXIS
Q262=75 ;NOMINAL DIAMETER
Q325=+0 ;STARTING ANGLE
Q247=+60 ;STEPPING ANGLE
Q261=-5 ;MEASURING HEIGHT
Q320=0 ;SET-UP CLEARANCE
Q260=+20 ;CLEARANCE HEIGHT
Q301=0 ;MOVE TO CLEARANCE
Q305=12 ;NO. IN TABLE
Q331=+0 ;DATUM
Q332=+0 ;DATUM
Q303=+1 ;MEAS. VALUE
TRANSFER
Q381=1 ;PROBE IN TS AXIS
Q382=+85 ;1ST CO. FOR TS AXIS
Q383=+50 ;2ND CO. FOR TS AXIS
Q384=+0 ;3RD CO. FOR TS AXIS
Q333=+1 ;DATUM
Q423=4 ;NO. OF PROBE POINTS
Q365=1 ;TYPE OF TRAVERSE