HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 47)

HEIDENHAIN TNC 320 47
2.4 D
a
tu
m Set
ting (Without a 3-D T
o
uc
h Pr
obe)
2.4 Datum Setting (Without a 3-D
Touch Probe)
Note
You fix a datum by setting the TNC position display to the coordinates
of a known position on the workpiece.
Preparation
8 Clamp and align the workpiece.
8 Insert the zero tool with known radius into the spindle.
8 Ensure that the TNC is showing the actual position values.
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.
For datum setting with a 3-D touch probe, refer to the
Touch Probe Cycles Manual.
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=
Y
X
Z
X
Y