HEIDENHAIN iTNC 530 (340 49x-03) ISO programming - Manual (Page 242)

242 6 Programming: Programming Contours
6.6 Gener
ating Cont
our Pr
ogr
ams
fr
om DXF D
ata (Sof
tw
ar
e Option)
Specifying the reference point
The datum of the drawing for the DXF file is not always located in a
manner that lets you use it directly as preset for the workpiece.
Therefore, the TNC has a function with which you can shift the
drawing datum to a suitable location by clicking an element.
You can define a reference point at the following locations:
„
At the beginning, end or center of a straight line
„
At the beginning or end of a circular arc
„ At the transition between quadrants or at the center of a complete
circle
„ At the intersection of a
„ straight line and a straight line, even if the intersection is actually
on the extension of one of the lines
„
straight line and a circular arc
„
straight line and a complete circle
„ circle and circle (regardless of whether a circular arc or a full circle)
You must use the touchpad on the TNC keyboard or a
mouse attached via the USB port in order to specify a
reference point.
You can also change the reference point once you have
already selected the contour. The TNC does not calculate
the actual contour data until you save the selected
contour in a contour program.