HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 546)

546 TURN PLUS
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Contour recessing, recess turning
The cutting radius must be smaller than the smallest inside radius of
the recess contour, but >= 0.2 mm. TURN PLUS determines the
width of the recessing tool from the recess contour:
 Recess contour includes paraxial base elements with radii on both
sides: SB <= b + 2*r (if radii differ: smallest radius).
 Recess contour includes paraxial base elements without radii or
with a radius on one side: SB <= b
 Recess contour does not include paraxial base elements: The width
of the recessing tool is determined from the recessing width divisor
(machining parameter 6 – SBD).
Abbreviations:
 SB: Width of recessing tool
 b: Width of base element
 r: Radius
Drilling
Depending on the geometry of the bore hole, the AWG determines
the appropriate tool. For centric bore holes, TURN PLUS uses
stationary tools.