Siemens Sinumerik 802D sl Programming Manual page 75

04.07
Control points and programs
When control points 1 to 8 are used, the imaginary tool nose position should be
used as the reference to write a program. Write the program after setting a coordi-
nate system.
Imaginary tool
nose point
= Programmed
shape
Portion left
uncut
(a) Program without nose R offset function
The imaginary tool nose point follows the
programmed shape, causing overcuts and
undercuts at tapers and arcs.
Fig. 3-12 Program and tool movements for control points 1 to 8
When control points 0 or 9 is used, the center of nose R should be used as the
reference to write a program. Write the program after setting a coordinate system.
If the nose R offset function is not used, the program shape must not be different
from the shape to be machined.
(a) Program without nose R offset function
The center of nose R follows the programmed shape.
Therefore, if the coordinate system is set in reference
to the center of nose R, the shape to be programmed
must be different from the shape to be machined.
Fig. 3-13 Program and tool movements for control point 0 or 9
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SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning - - 04.07 Edition
Center of nose R
R
Imaginary tool nose
Movements of
imaginary tool nose
Programmed shape
Center of nose R
(imaginary tool nose)
R
Movements of center of
nose R
Programmed shape
Movement Control Commands
3.4 Tool offset functions
Imaginary tool
nose point
(b) Program with nose R offset function
The nose R offset function offsets the tool
paths from the programmed shape to
eliminated overcuts and undercuts.
(b) Program with nose R offset function
As with the program (b) in Fig. 3-12, appropriate off-
setting is made to finish the shape accurately
without overcuts and undercuts.
Center of nose R
R
Imaginary tool nose
Movements of
imaginary tool nose
Programmed shape
Center of nose R
(imaginary tool nose)
R
Movements of
center of nose R
Programmed shape
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