Siemens SINUMERIK 840D sl Function Manual page 1854

Detailed Description
2.4 Tool radius compensation 2D (TRC)
3. At least one axis of the machining plane is programmed.
Velocity of the preceding block (typically G0).
All movements from point P
parallel to the machining plane and the part of the infeed movement up to the safety
clearance.
Programming the feedrate with FAD
FAD programmed with ...
G340
G341
If FAD is not programmed, this part of the contour is traversed at the velocity, which is active
modally from the preceding block, in the event that no F command defining the velocity is
programmed in the SAR block.
Programmed response:
FAD=0 or negative
FAD=...
FAD=PM(...)
FAD=PR(...)
66
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
produced when tool radius compensation is 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.
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
No special measures are required for deselection of tool radius compensation, because
the programmed point P
the end of the complete contour.
The start and end points of the SAR contour (P
retraction.
→
→
→
→
to P
1
already directly defines the position of the tool center point at
0
to point P are performed at this velocity, i.e., the movement
0 2
Feedrate from P or P
2
Feedrate of the infeed movement perpendicular to the machining
plane from P to P .
2 3
Alarm Output
Programmed value acts in accordance with the active G code
of group 15 (feed type; G93, G94, etc.)
Programmed value is interpreted as linear feed (like G94),
irrespective of the active G code of group 15
Programmed value is interpreted as revolutional feed (like
G95), irrespective of the active G code of group 15
is inserted such that no movement is
0
.
0
and P ) can coincide on approach and
0 4
to P .
3 4
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0