Siemens SINUMERIK 828D Programming Manual page 323

Example 2: Approach with G461
Program code
N10 $TC_DP1[1,1]=120
N20 $TC_DP6[1,1]=10
N30 X0 Y0 F10000 T1 D1
N40 Y20
N50 G42 X50 Y5 G461
N60 Y0 F600
N70 X30
N80 X20 Y-5
N90 X0 Y0 G40
N100 M30
Further information
G461
If no intersection is possible between the last TRC block and a preceding block, the offset
curve of this block is extended with a circle whose center point lies at the end point of the
uncorrected block and whose radius is equal to the tool radius.
The control attempts to cut this circle with one of the preceding blocks.
Figure 10-4
Collision monitoring CDON, CDOF
If CDOF is active (see section Collision monitoring, CDON, CDOF), the search is aborted
when an intersection is found, i.e., the system does not check whether further intersections
with previous blocks exist.
If CDON is active, the search continues for further intersections after the first intersection is
found.
An intersection point, which is found in this way, is the new end point of a preceding block
and the start point of the deactivation block. The inserted circle is used exclusively to
calculate the intersection and does not produce a traversing movement.
Note
If no intersection is found, alarm 10751 (collision danger) is output.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Retraction behavior with G461
10.4 Smooth approach and retraction
Comment
; Milling tool type
; Tool radius
Tool radius compensation
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