Siemens SINUMERIK 840D, Operating Manual

Page: 65 / 610

Setting up the machine
2.5 Measuring the tool
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
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2.5.4 Fixed point calibration
If you want to use a fixed point as the reference point in manual measurement of the tool
length, you must first determine the position of the fixed point relative to the machine zero.
Test socket
You can use a mechanical test socket as the fixed point, for example. Mount the test socket
on the machine table in the machining space of the machine. Enter zero as the distance.
Distance gauge
However, you can also use any fixed point on the machine in combination with a distance
gauge. Enter the thickness of the plate as "DZ".
To calibrate the fixed point, use either a tool whose length is known (i.e. the tool length must
be entered in the tool list) or the spindle directly.
The position of the fixed point may have already been determined by the machine
manufacturer.
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Procedure
1. Traverse the tool or spindle to the fixed point.
2. Press the "Measure tool" softkey in the "JOG" mode.
3. Press the "Calibrate fixed point" softkey.
4. Enter a correction value for "DZ".
If you have used a distance gauge, enter the thickness of the plate
used.
5. Press the "Calibrate" softkey.
6. The distance between machine zero and fixed point is calculated and
entered in the machine data.