HEIDENHAIN TNC 320 User Manual page 499

Compact contouring control

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Table of Contents

Datum setting without a 3-D touch

When you set a datum, you set the TNC display to the coordinates

of a known workpiece position.

All manual probe functions are available with a 3-D

touch probe.

Further Information:

touch probe ", page 521

Clamp and align the workpiece

Insert the zero tool with known radius into the spindle

Ensure that the TNC is showing the actual positions

Datum setting with an end mill

Protective measure

If the workpiece surface must not be scratched, you

can lay a metal shim of known thickness d on it. You

then enter a value that is greater than the desired

preset by the value d.

Operating mode: Press the Manual operation key

Move the tool slowly until it touches (scratches)

the workpiece surface

Select the axis

DATUM SETTING 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

Repeat the process for the remaining axes.

If the values for the tool in the tool axis have already been set, set

the display of the tool axis to the length L of the tool or enter the

The TNC automatically saves the datum set with the

axis keys in line 0 of the preset table.

HEIDENHAIN | TNC 320 | Conversational Programming User's Manual | 9/2016

Datum setting without a 3-D touch probe 13.5

"Datum setting with a 3-D