Siemens SINUMERIK 840D sl Programming Manual page 346

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Tool offsets

8.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)

Intersection procedure for 3D compensation

With 3D circumferential milling, G code G450/G451 is now evaluated at the outside corners;

this means that the intersection of the offset curves can be approached. Up to SW 4 a circle

was always inserted at the outside corners. The intersection procedure is especially

advantageous for 3D programs typically generated by CAD. These often consist of short

straight blocks (to approximate smooth curves), where the transitions between adjacent

blocks are almost tangential.

Up to now, with tool radius compensation on the outside of the contour, circles were

generally inserted to circumnavigate the outside corners. These blocks can be very short

with almost tangential transitions, resulting in undesired drops in velocity.

In these cases, as with 2 ½ D radius compensation, both of the curves involved are

lengthened and the intersection of both lengthened curves is approached.

The intersection is determined by extending the offset curves of the two participating blocks

and defining the intersection of the two blocks at the corner in the plane perpendicular to the

tool orientation. If there is no such intersection, the corner is handled as previously, that is, a

circle is inserted.

Further information for the intersection procedure /FB/ W5, 3D Tool Radius Compensation

Transition circle (tool travels round workpiece corners on a

circular path).

Intersection of equidistant paths (tool backs off from the

workpiece corner).

Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

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