Intersection Procedure For Polynomials - Siemens SINUMERIK 840D sl Function Manual

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2.4 Tool radius compensation 2D (TRC)

Intersection procedure for polynomials

If two curves with active tool radius compensation form an outside corner, depending on the

G code of the 18th group (corner behavior with tool compensation; G450/G451) and

regardless of the type of curves involved (straight lines, circles, polynomials):

• Either a conic is inserted to bypass the corner

• The curves involved are extrapolated to form an intersection.

If no intersection is found with G451 activated, or if the angle formed by the two curves is too

steep, switchover to insert mode is automatic.

The intersection procedure for polynomials is released with the machine data:

MD20256 $MC_CUTCOM_INTERS_POLY_ENABLE (Intersection process possible for

polynomials).

If this machine data is set to inactive, a block (can be very short) is always inserted (even if

transitions are almost tangential). These short blocks always produce unwanted drops in

speed during G64 operation.

Basic logic functions: Tool Offset (W1)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

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