HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 55)

HEIDENHAIN TNC 620 55
2.4 D
a
tum Set
ting (Without a 3-D T
ouc
h Pr
obe)
Datum setting 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
Fragile workpiece?
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 SET Z=
The TNC automatically saves the datum set with the axis
keys in line 0 of the preset table.