HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 254)

Programming: Data transfer from DXF files or plain-language contours
7.1 Processing DXF Files (Software Option)
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Dividing, extending and shortening contour elements
If contour elements to be selected in the drawing connect poorly,
then you must first divide the contour element. This function
is automatically available if you are in the mode for selecting a
contour.
Proceed as follows:
The poorly connecting contour element is selected, so it is
colored blue
Click the contour element to be divided: The TNC shows the
point of intersection with a star in a circle, and the selectable
end points with simple stars
Press the CTRL key and click the point of intersection: The TNC
divides the contour element at the point of intersection and
the stars disappear. If there is a gap, or the elements overlap,
the TNC extends or shortens these poorly connecting contour
elements to the point of intersection of the two elements
Click the divided contour element again: The TNC shows the
end points and points of intersection again
Click the desired end point: The TNC now colors the divided
element blue
Select the next contour element
If the contour element to be extended or shortened
is a straight line, then the TNC extends/shortens the
contour element along the same line. If the contour
element to be extended or shortened is a circular arc,
then the TNC extends/shortens the contour element
along the same arc.
In order to use this function, at least two contour
elements must already be selected, so that the
direction is clearly determined.