Siemens SINUMERIK 840D sl Programming Manual page 306

Tool radius compensation
10.4 Smooth approach and retraction
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Approach and retraction velocities
• Velocity of the previous block (G0):
All motions from P
machining plane and the part of the infeed motion up to the safety clearance.
• Programming with FAD:
Specification of the feedrate for
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• Programmed feedrate F:
This feedrate value is effective as of P
programmed in the SAR block, the speed of the previous block is active.
306
If in the SAR block only the axis perpendicular to the machining plane is programmed,
the contour will end at P
above. If the SAR block is also the TRC disable block, an additional path from P
is inserted such that no motion results at the end of the contour when disabling the
TRC.
If only one axis on the machining plane is programmed, the missing second axis is
modally added from its last position in the previous block.
up to P
0
G341: infeed movement perpendicular to the machining plane from P
G340: from point P or P
2
If FAD is not programmed, this part of the contour is also traversed at the modally
active speed of the previous block, if no F word is programmed in the SAR block.
. The positions of the remaining axes will result, as described
1
are executed at this velocity, i.e. the motion parallel to the
2
to P
3 4
or P if FAD is not programmed. If no F word is
3 2
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
to P
1 0
to P
2 3
Fundamentals