HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 45)

TNC 425/TNC 415 B/TNC 407 2-7
2 Manual Operation and Setup
Fig. 2.5: Workpiece setting in the tool axis: right with protective
shim.
Z e.g.
ENT
0 e.g.
ENT
5 0 e.g.
Z
X
Z
X
d
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 9-11).
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 the actual values (see page 11-9).
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 the workpiece surface.
Select the tool axis.
DATUM SET Z =
Zero tool: Set the display to Z = 0 or enter the thickness d of the shim.
Preset tool: Set the display to the length L of the tool, (here Z=
50 mm) or enter the sum Z=L+d.