HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 471)

HEIDENHAIN TNC 128 471
20.4 F
undamentals of t
o
ol measur
ement
Setting the machine parameters
When measuring a rotating tool, the TNC automatically calculates the
spindle speed and feed rate for probing.
The spindle speed is calculated as follows:
n = maxPeriphSpeedMeas / (r • 0.0063) where
The feed rate for probing is calculated from:
v = meas. tolerance • n where
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:
Before you start work with the TT cycles, inspect all
machine parameters defined in ProbeSettings >
CfgToolMeasurement
and CfgTTRoundStylus.
The TNC uses the feed rate for probing defined in
probingFeed
when measuring a tool at standstill.
n Shaft speed [rpm]
maxPeriphSpeedMeas Maximum permissible surface cutting speed
in m/min
r Active tool radius in mm
v Feed rate for probing in mm/min
Measuring tolerance Measuring tolerance [mm], depending on
maxPeriphSpeedMeas
n Shaft speed in rpm
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