HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 582)

Touch Probe Cycles: Automatic Tool Measurement
20.1 Fundamentals
20
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TNC 640 | User's Manual Cycle Programming | 3/2014
Setting machine parameters
Before you start working with the measuring
cycles, check 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.
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
n: Spindle speed [rpm]
maxPeriphSpeedMeas: Maximum permissible cutting speed in
m/min
r: Active tool radius in mm
The feed rate for probing is calculated from:
v = measuring tolerance • n with
v: Feed rate for probing in mm/min
Measuring tolerance Measuring tolerance [mm], depending
on
maxPeriphSpeedMeas
n: Shaft speed [rpm]