2 Manual Operation and Setup
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2.3 Setting the Datum without a 3D Touch Probe
You fix a datum by setting the TNC 370 position display to the coordi-
nates of a known point on the workpiece. The fastest, easiest and most
accurate way of setting the datum is by using a 3D touch probe system
from HEIDENHAIN (see page 9-9).
To prepare the TNC
I
Clamp and align the workpiece.
I
Insert the zero tool with known radius into the spindle.
Select the MANUAL OPERATION mode.
Ensure that the TNC is showing actual position values (see page 1 I-6).
Setting the datum in the tool axis
d
4
Fig. 2.5: Datum setting in the tool axis; right with protective shim
Move the tool until it touches the workpiece surface.
1
Select the tool axis.
For a zero tool: Set the display to Z = 0 or enter thickness d of the
shim.
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For a preset tool: Set the display to the length L of the tool, for
example Z=50 mm, or enter the sum Z=L+d.
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L
TNC 370
2-7 ’
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