HEIDENHAIN TNC 360 ISO Programming - Manual (Page 44)

TNC 360 2-7
2 Manual Operation and Setup
Z
X
Z
X
d
Fig. 2.5: Datum setting in the tool axis; right with protective shim
Z e.g.
e.g.
0
ENT
e.g.
5 0
ENT
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 page 2-14).
To prepare the TNC:
Clamp and align the workpiece.
Insert the zero tool with known radius into the spindle.
Select the MANUAL OPERATION mode.
Ensure that the TNC is showing actual position values (see p. 10-4).
Setting the datum in the tool axis
Protective arrangement:
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 workpiece surface.
Select the tool axis.
DATUM SET Z =
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.