HEIDENHAIN TNC 310 (286 140) - Manual (Page 31)

19 HEIDENHAIN TNC 310
Y
X
Z
X
Y
2.4 Setting the Datum
2.4 Datum Setting
(Without a 3-D Touch Probe)
You fix a datum by setting the TNC position display to the
coordinates of a known position on the workpiece.
Preparation
ú Clamp and align the workpiece.
ú Insert the zero tool with known radius into the spindle.
ú Ensure that the TNC is showing the actual position values.
Datum setting
Fragile workpiece? If the workpiece surface must not be scratched,
you can lay a metal shim of know thickness
d on it. Then enter a
tool axis datum value that is larger than the desired datum by the
value
d.
Select the Manual Operation mode.
<
Move the tool slowly until it touches the
workpiece surface.
<
Select the function for setting the datum
<
Select the axis.
DATUM SET Z=
<
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.