HEIDENHAIN iTNC 530 223
7.1 Processing DXF Files (Software 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 a reference point 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 between:
 A straight line and a straight line, even if the intersection is actually 
on the extension of one of the lines
 A straight line and circular arc
 A straight line and full circle
 A 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.