Siemens SINUMERIK 840D sl Function Manual page 1426

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W1: Tool offset

18.5 Tool radius compensation 2D (TRC)

Figure 18-25 Overshoot with DISC depending on contour angle

G451 (intersection)

If G function G451 is active, the position (intersection) resulting from the path lines (straight

line, circle or helix only) located at a distance of the tool radius to the programmed contour

(center-point path of the tool), is approached. Spines and polynomials are never extended.

Very pointed outside corners

Where outside corners are very pointed, G451 can result in excessive idle paths. Therefore,

the system switches automatically from G451 (intersection) to G450 (transition circle, with

DISC where appropriate) when outside corners are very pointed.

The threshold angle (contour angle) for this automatic switchover (intersection point →

transition circle) can be specified in the machine data:

MD20210 $MC_CUTCOM_CORNER_LIMIT (Max. angle for compensation blocks with tool

radius compensation).

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Basic Functions

Sinumerik 828d Sinumerik 840de sl