2 a u to matic d at u m set ting – HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles User Manual
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HEIDENHAIN TNC 426, TNC 430
59
3.2 A
u
to
matic D
at
u
m Set
ting
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Center of 1st axis
Q273 (absolute): bolt hole circle
center (nominal value) in the reference axis of the
working plane.
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Center in 2nd axis
Q274 (absolute): bolt hole circle
center (nominal value) in the minor axis of the working
plane.
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Nominal diameter
Q262: enter the approximate bolt
hole circle diameter. The smaller the hole diameter,
the more exact the nominal diameter must be.
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Angle of 1st hole
Q291 (absolute): polar coordinate
angle of the first hole center in the working plane.
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Angle of 2nd hole
Q292 (absolute): polar coordinate
angle of the second hole center in the working plane.
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Angle of 3rd hole
Q293 (absolute): polar coordinate
angle of the third hole center in the working plane.
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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.
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Clearance height
Q260 (absolute): coordinate in the
touch probe axis at which no collision between tool
and workpiece (fixtures) can occur.
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Datum number in table
Q305: enter the datum
number in the table in which the TNC is to save the
coordinates of the bolt-hole circle center. If you enter
Q305=0, the TNC automatically sets the display so
that the new datum is on the bolt hole center.
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New datum for reference axis
Q331 (absolute):
coordinate in the reference axis at which the TNC
should set the bolt-hole center.
Basic setting = 0
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New datum for minor axis
Q332 (absolute):
coordinate in the minor axis at which the TNC should
set the bolt-hole center.
Basic setting = 0
Example: NC blocks
5 TCH PROBE 416 DATUM CIRCLE CENTER
Q273=+50 ;CENTER IN 1ST AXIS
Q274=+50 ;CENTER IN 2ND AXIS
Q262=90 ;NOMINAL DIAMETER
Q291=+35 ;ANGLE OF 1ST HOLE
Q292=+70 ;ANGLE OF 2ND HOLE
Q293=+210 ;ANGLE OF 3RD HOLE
Q261=-5 ;MEASURING HEIGHT
Q260=+20 ;CLEARANCE HEIGHT
Q305=12 ;NO. IN TABLE
Q331=+0 ;DATUM
Q332=+0 ;DATUM