HEIDENHAIN ND 780 Handbuch Seite 196

The tool radius compensation is applied based on the radius
of the current tool. If the plane selection involves the tool
axis, the tool tip is assumed to have a ball end.
To follow the contour, move the two axes in small steps, keeping

the X, and Y positions as close to zero (0.0) as possible.
When no step size is specified, the incremental display always

shows the distance from the closest point on the arc.
Press the VIEW soft key to toggle through the three available views

(incremental DRO, contour, and absolute DRO).
 The contour view shows the position of the tool relative to the
milling surface. When the cross hair representing the tool is on the
line representing the surface, the tool is in position. The tool cross
hair remains fixed in the center of the graph. As the table is
moved, the surface line moves.
Press END to exit the milling operation.

The tool offset direction (R+ or R-) is applied based on the
tool position. The operator must approach the contour
surface from the appropriate direction for tool
compensation to be correct.
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I Operating Instructions