User's Manual TNC 360 (from 259 900-11) - heidenhain

2 Manual Operation and Setup
2.3 Setting the Datum Without a 3D Touch Probe
You fix a datum by setting the TNC position display to the coordinates 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 p. 2-14).
To prepare the TNC:
Clamp and align the workpiece.
Insert the zero tool with known radius into the spindle.
e.g.
Z
e.g. 0 ENT
e.g. 5 0 ENT
Select the MANUAL OPERATION mode.
Ensure that the TNC is showing actual position values (see p. 11-4).
Setting the datum in the tool axis
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.
Move the tool until it touches with workpiece surface.
DATUM SET Z =
TNC 360 2-7
Z
Select the tool axis.
X
Fig. 2.5: Datum setting in the tool axis; right with protective shim
For a zero tool: Set the display to Z = 0 or enter thickness d of the shim.
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.
Z
d
X