Siemens SINUMERIK 840D Programming Manual page 337

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4.10 Extended stock removal cycle – CYCLE950 (SW 5.3 and higher)
Note on simulation
In the simulation of the extended stock removal cycle
CYCLE950, the generated programs are saved to the
NCU file system. Therefore, only the "NC Active Data"
setting is practical since tool offset data are included in
program calculation.
Blank updating
The extended stock removal cycle CYCLE950
detects residual material during roughing and is able
to generate an updated blank contour outside the
machining process, which can be used in a further
machining step.
To do this, the cycle internally considers the angle at
the tool point.
The relief cut angle of the tool must be entered in the
tool offset data (parameter 24).
The cycle defines the main cutting edge angle
automatically according to the tool point position.
For tool point positions 1 to 4, the blank update is
calculated with a main cutting edge angle of 90°. For
tool point positions 5 to 9, the main cutting angle is
assumed to be identical to the relief cut angle.
If CYCLE950 is called more than once, each time with
blank update, in the same program, different names
for the generated blank contours must be assigned; it
is not permissible to use the program name
(parameter _NP8) more than once.
Extended stock removal cannot be performed in m:n
configurations.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Turning Cycles
X
Machining direction
Finished-part contour
Blank contour
α
Finishing allowance
α = Relief cut angle of turning tool
Tool point direction 3
Main
cutting
α
90°
edge angle
Tool point direction 8
Main
cutting
α α
edge angle
4
α
Z
Residual contour
for relief cutting
Tool clearance angle
Tool clearance angle
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