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Fundamentals, File Management | Fundamentals
Selecting the preset
A production drawing identifies a certain form element of the
workpiece, usually a corner, as the absolute preset (datum). When
setting the preset, you first align the workpiece along the machine
axes, and then move the tool in each axis to a defined position
relative to the workpiece. Set the display of the control either to
zero or to a known position value for each position. This establishes
the reference system for the workpiece, which will be used for the
control's display and your part program.
If the production drawing is dimensioned in relative presets, simply
use the coordinate transformation cycles.
Further information:
"DATUM SHIFT (Cycle 7)", page 595
If the production drawing is not dimensioned for NC, set the
preset at a position or corner on the workpiece from which
the dimensions of the remaining workpiece positions can be
measured.
Example
The workpiece drawing shows holes
are shown with respect to an absolute preset with the coordinates
X=0 Y=0. The coordinates of holes
preset with the absolute coordinates X=450 Y=750. By using
the Datum shift cycle you can shift the datum temporarily to the
position X=450, Y=750 and program the holes
further calculations.
HEIDENHAIN | TNC 128 | Conversational Programming User's Manual | 10/2017
(1
to 4), whose dimensions
5
to
7
refer to the relative
(5
to 7) without
3
111
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