Siemens SINUMERIK 828D Function Manual page 1496

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W1: Tool offset

18.5 Tool radius compensation 2D (TRC)

End point behind contour

If the end point is behind the contour, a circle or straight line is always inserted depending on G450/G451. In this

case, G460-G462 has no effect.

If, in this situation, the last traversing block has no intersection with a preceding block, an intersection with the

inserted contour element or with the linear section from the end point of the circumnavigation circle to the

programmed end point can result.

If the inserted contour element is a circle (G450), and it intersects with the preceding block, this is the same as

the intersection, which would be produced with NORM and G461. In general, however, a remaining section of the

circle still has to be traversed. An intersection calculation is no longer required for the linear section of the

retraction block.

In the second case (if no intersection is found between the inserted contour element and the preceding blocks),

the intersection between the retraction straight line and a preceding block is approached.

Therefore, when G461 or G462 is active, behavior deviating from G460 can only arise if NORM is active or if

behavior with KONT is identical to NORM due to the geometrical conditions.

The approach behavior is symmetrical to the retraction behavior.

The approach/retraction behavior is determined by the state of the G command in the

approach/retraction block. The approach behavior can therefore be set independently of the

retraction behavior.

Program for using G461 during approach:

N10 $TC_DP1[1,1]=120

N20 $TC_DP6[1,1]=10

N30 X0 Y0 F10000 T1 D1

N50 G42 X50 Y5 G461

N90 X0 Y0 G40

; Tool type mill

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

Basic Functions

Sinumerik 840d sl