Siemens SINUMERIK 840D Programming Manual page 335

4
03.96
09.01
4.10 Extended stock removal cycle – CYCLE950 (SW 5.3 and higher)
_TOL1 (blank tolerance)
Since a blank does not always correspond exactly to the
blank definition when it is cast or forged for example, it
makes sense not to travel to the blank contour with G0
for roughing and for the infeed but to activate G1 shortly
beforehand to compensate for any tolerances.
Parameter _TOL1 defines the distance from the blank
at which G1 becomes active.
Traversing is started with G1 at this incremental amount
before the blank. If the parameter is not programmed, it
has the value 1mm.
Further notes
Contour definition
Unlike CYCLE95, one block that contains a link to the
current plane is sufficient for contour programming.
For further details of contour definition, see
CYCLE95.
Blank contour definition
A blank contour must either be a closed contour
(starting point=end point) which encompasses the
finished-part contour either partially or fully, or a
contour section between the starting and end points
of the finished-part contour. The programmed
direction is irrelevant.
Blank contours always must be described in a way
that they are not partly identical with the finished-part
contours, i.e. the machined materials are not
combined
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Turning Cycles
Blank definition
X
with closed contour
Finished part contour
Blank contour
X
Blank contour as contour section between
starting and end point of fin. part contour
Blank and fin.
Finished part contour
part end point
Blank contour
Blank and fin. part starting point
X
Blank contour and finished
part contour are identical
4
Starting point
=blank end point
Z
Z
Z
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