HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 149)

HEIDENHAIN TNC 320 149
4.1 T
o
ol Measur
ement with the T
T
T
ool T
o
uc
h Pr
obe
probingFeedCalc determines the calculation of the probing feed rate:
probingFeedCalc = ConstantTolerance:
The measuring tolerance remains constant regardless of the tool
radius. With very large tools, however, the feed rate for probing is
reduced to zero. The smaller you set the maximum permissible
rotational speed (maxPeriphSpeedMeas) and the permissible tolerance
(measureTolerance1), the sooner you will encounter this effect.
probingFeedCalc = VariableTolerance:
The measuring tolerance is adjusted relative to the size of the tool
radius. This ensures a sufficient feed rate for probing even with large
tool radii. The TNC adjusts the measuring tolerance according to the
following table:
probingFeedCalc = ConstantFeed:
The feed rate for probing remains constant, the error of measurement,
however, rises linearly with the increase in tool radius:
Measuring tolerance = (r • measureTolerance1)/ 5 mm) where
Tool radius Measuring tolerance
Up to 30 mm measureTolerance1
30 to 60 mm 2 • measureTolerance1
60 to 90 mm 3 • measureTolerance1
90 to 120 mm 4 • measureTolerance1
r Active tool radius in mm
measureTolerance1 Maximum permissible error of measurement