Siemens SINUMERIK 828D Function Manual page 1470

W1: Tool offset
18.5 Tool radius compensation 2D (TRC)
Possible ways of programming the end point P
The end position is always taken from the SAR block, no matter how many axes have been programmed. We
distinguish between the following situations:
1. No geometry axis is programmed in the SAR block.
In this case, the contour ends at point P
describe the machining plane, is determined by the retraction contour (end point of the straight line or arc).
The axis component perpendicular to this is defined by DISCL. If, in this case, DISCL = 0, the movement
takes place completely within the plane.
2. Only the axis perpendicular to the machining plane is programmed in the SAR block.
In this case, the contour ends at point P
in 1.
Retraction with SAR with simultaneous deactivation of TRC
If the SAR retraction block is also used to deactivate tool radius compensation, in the case of 1. and 2., an
additional path from P
deactivated at the end of the retraction contour, i.e., this point defines the tool center point and not a position
on a contour to be corrected.
3. At least one axis of the machining plane is programmed.
The second axis of the machining plane can be determined modally from its last position in the preceding
block. The position of the axis perpendicular to the machining plane is generated as described in 1. or 2.,
depending on whether this axis is programmed or not. The position generated in this way defines the end
point P .
0
No special measures are required for deselection of tool radius compensation, because the programmed
point P already directly defines the position of the tool center point at the end of the complete contour.
0
The start and end points of the SAR contour (P
Velocity of the preceding block (typically G0).
All movements from point P
machining plane and the part of the infeed movement up to the safety clearance.
1470
for retraction
0
(or at point P
2
. The position of the two other axes is determined in the same way as
1
to P is inserted such that no movement is produced when tool radius compensation is
1 0
to point P are performed at this velocity, i.e., the movement parallel to the
0 2
, if P and P coincide). The position in the axes, which
1 1 2
and P ) can coincide on approach and retraction.
0 4
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions