9 3D Touch Probes
-._
9.7 Measuring Tools with the lT 120 Touch Probe
L
L
.
The
TNC
and the machine toaf
must be set up by the machine tool buElder
for use of the TT 120. Tool measurement
with the 37’
120
is ctnly available on machines w&h spindle control {oriented spindle stop).
In conjunction with the TNC’s tool measurement cycles, the TT 120
enables you to measure tools automatically. The compensation values
for tool length and radius are stored in the central tool file TO0L.T and
accounted for in the next tool call. The following types of tool measure-
ment are provided:
l
Tool measurement while the tool is at standstill
l
Tool measurement while the tool is rotating
l
Measurement of the individual cutting edges
The tool measurement cycles are defined in the PROGRAMMING AND
EDITING mode of operation and are executed in a program run mode of
operation. The following cycles are available:
l
TCH PROBE 30.0 l-i- CALIBRATE
l
TCH PROBE 31.0 TOOL LENGTH
l
TCH PROBE 32.0 TOOL RADIUS
Setting the machine parameters
The TNC measures a stationary tool with the probe feed rate defined in
MP6520 (see page 12-5).
When a rotating tool is to be measured, the TNC automatically calculates
the spindle speed and the probe feed rate.
The spindle speed is calculated as follows:
MP6570
n = 2
l R l
r
l
0.001
where
n= Spindle speed [rpml
MP6570 = Max. permissible rotational speed
[m/min]
r= Active tool radius [mm]
The probe feed rate is derived from:
v = Measuring tolerance 9 n
where v= Probe feed rate [mm/mini
Measuring tolerance = Measuring tolerance [mm],
depending on MP6507
n= Spindle speed [l/mini
MP6507 enables you to set the calculation of the probe feed rate (also
see page 12-5):
MP6507=0: The measuring tolerance remains constant regardless of
the tool radius. With very large tools, however, the probe
feed rate is decreased to zero. The smaller the maximum
rotational speed (MP6570) and the smaller the permissible
tolerance (MP6510). the sooner the feed rate will be
decreased.
TNC 370
9-31
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