HEIDENHAIN TNC 640, User Manual, Page: 340 / 948

Data Transfer from CAD Files | CAD import (option 42)
8
340
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Setting a preset
The datum of the drawing in the CAD file is not always located
in a manner that lets you use it directly as a workpiece preset.
Therefore, the control has a function with which you can shift the
workpiece preset to a suitable location by clicking an element. You
can also define the orientation of the coordinate system.
You can define a preset at the following locations:
At the beginning, end or center of a straight line
At the beginning, center or end of a circular arc
At the transition between quadrants or at the center of a
complete circle
At the intersection between:
A straight line and a straight line, even if the intersection is
actually on the extension of one of the lines
Straight line – circular arc
Straight line – full circle
Circle – circle (regardless of whether a circular arc or a full
circle)
Operating notes:
You can change the preset even after you have
selected the contour. The control does not calculate
the actual contour data until you save the selected
contour in a contour program.
The preset and optional orientation are inserted in
the NC program as a comment starting with
origin
.
Selecting a preset on a single element
Select the mode for specifying the preset
Click the desired element with the mouse
The control indicates possible locations for
presets on the selected element with stars.
Click the star you want to select as preset
Use the zoom function if the selected element is
too small
The control sets the preset symbol at the
selected location.
You can adjust the orientation of the coordinate
system, if required.
Further information: "Adjusting the orientation
of the coordinate system", page 341