Touch Probe Cycles: Automatic Datum Setting
14.6 DATUM FROM INSIDE OF CIRCLE (Cycle 412, DIN/ISO: G412)
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HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
Cycle parameters
Q321 Center in 1st axis? (absolute): Center of the
pocket in the reference axis of the working plane.
Input range -99999.9999 to 99999.9999
Q322 Center in 2nd axis? (absolute): Center of the
pocket in the secondary 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
Q262 Nominal diameter?: 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
Q325 Starting angle? (absolute): Angle between
the reference axis of the working plane and the first
touch point. Input range -360.000 to 360.000
Q247 Intermediate 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
Q261 Measuring height in probe axis? (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
Q320 Set-up clearance? (incremental): Additional
distance between measuring point and ball tip.
Q320 is added to SET_UP in the touch probe table.
Input range 0 to 99999.9999
Q260 Clearance height? (absolute): coordinate in
the touch probe axis at which no collision between
tool and workpiece (fixtures) can occur. Input range
-99999.9999 to 99999.9999
Q301 Move to clearance height (0/1)?: 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
Q305 Number in table?: 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 on the pocket
center. If Q303=0: If you enter Q305=0, the TNC
writes to line 0 of the datum table. Input range 0 to
99999
NC blocks
5 TCH PROBE 412 DATUM INSIDE
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 ;NUMBER 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
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