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4 datum setting without a 3-d touch probe, Note, Preparation – HEIDENHAIN TNC 320 (77185x-01) User Manual

Page 424: Workpiece presetting with axis keys, Datum setting without a 3-d touch probe

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Manual operation and setup

13.4 Datum setting without a 3-D touch probe

13

424

TNC 320 | User's Manual

HEIDENHAIN Conversational Programming | 3/2014

13.4

Datum setting without a 3-D touch
probe

Note

Setting the datum with a 3-D touch probe: see

"Datum Setting with 3-D Touch Probe ", page 446.

You fix a datum by setting the TNC position display to the

coordinates of a known position on the workpiece.

Preparation

Clamp and align the workpiece
Insert the zero tool with known radius into the spindle
Ensure that the TNC is showing the actual position values

Workpiece presetting with axis keys

Protective measure

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.

Select the

MANUAL OPERATION mode

Move the tool slowly until it touches (scratches)

the workpiece surface

Z

Select the axis

DATUM SETTING Z=

Zero tool, spindle axis: Set the display to a known

workpiece position (here, 0) or enter the thickness

d of the shim. In the machining plane: Take the

tool radius into account

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

The TNC automatically saves the datum set with the

axis keys in line 0 of the preset table.