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4 setting the datum, 4 setting the datum (without a 3-d touch probe) – HEIDENHAIN TNC 410 User Manual

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HEIDENHAIN TNC 410

Y

X

Z

X

Y

2.4 Setting the Datum

2.4 Setting the Datum

(Without a 3-D Touch Probe)

You fix a datum by setting the TNC position display to the
coordinates of a known position on the workpiece.

To prepare the TNC:

ú

Clamp and align the workpiece.

ú

Insert the zero tool with known radius into the spindle.

ú

Ensure that the TNC is showing the actual position values.

Set the datum
Fragile workpiece? If the workpiece surface must not be scratched,
you can lay a metal shim of know 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 the
workpiece surface.

<

Select the axis.

Datum Setÿÿÿ

<

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 tool radius.

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.