HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 122)

110 4 Touch Probe Cycles for Automatic Tool Measurement
4.1 T
o
ol Measur
ement with the T
T T
ool T
ouc
h Pr
obe
4.1 Tool Measurement with the TT
Tool Touch Probe
Overview
In conjunction with the TNC’s tool measurement cycles, the tool touch
probe enables you to measure tools automatically. The compensation
values for tool length and radius can be stored in the central tool file
TOOL.T and are accounted for in the next tool call. The following types
of tool measurement are provided:
n Tool measurement while the tool is at standstill.
n
Tool measurement while the tool is rotating.
n
Measuring individual teeth.
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 = MP6570 / (r • 0.0063) where
The feed rate for probing is calculated from:
v = meas. tolerance • n where
The TNC and the machine tool must be set up by the
machine tool builder for use of the TT touch probe.
Some cycles and functions may not be provided on your
machine tool. Refer to your machine manual.
The TNC uses the feed rate for probing defined in MP6520
when measuring a tool at standstill.
n Spindle speed (rpm)
MP6570 maximum permissible 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 MP6507
n speed in rpm