HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 448)

448 Manual Operation and Setup
14.4 D
a
tu
m Set
ting without a 3-D
T
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h
Pr
obe
Workpiece presetting with axis keys
Select the Manual Operation mode
Move the tool slowly until it touches (scratches) the
workpiece surface
Select the axis
Zero tool in spindle axis: Set the display to a known
workpiece position (here, 0) or enter the thickness d
of the shim. In the tool axis, offset the tool radius
Repeat the process for the remaining axes.
If you are using a preset tool, set the display of the tool axis to the
length L of the tool or enter the sum Z=L+d
Y
X
Z
X
Y
-R
-R
Protective measure
If the workpiece surface must not be scratched, you can
lay a metal shim of known thickness d on it. Then enter a
tool axis datum value that is larger than the desired datum
by the value d.
DATUM SETTING Z=
The TNC automatically saves the datum set with the axis
keys in line 0 of the preset table.