Siemens sinumerik 840d Programming Manual page 304

Path Traversing Behavior
9
9.1 Tangential control TANG, TANGON, TANGOF
840D
NCU 572
NCU 573
Activating/deactivating tangential control
TANGON, TANGOF
Tangential control is called with TANGON specifying
the following axis and the desired offset angle of the
following axis:
TANGON(C,90)
Meaning:
C axis is the following axis. On every movement of
the path axes, it is rotated into a position at 90° to
the path tangent.
The following axis is specified in order to deactivate
the tangential control:
TANGOF(C)
Angle limit through working area limitation
For path movements which oscillate back and forth,
the tangent jumps through 180° at the turning point
on the path and the orientation of the following axis
changes accordingly.
This behavior is generally inappropriate: the return
movement should be traversed at the same negative
offset angle as the approach movement.
This can be achieved by limiting the working area of
the following axis (G25, G26). The working area
limitation must be active at the instant of path
reversal (WALIMON).
If the offset angle lies outside the working area limit,
an attempt is made to return to the permissible
working area with the negative offset angle.
9-304
810D 840Di
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
Y
Y
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Y
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 Siemens AG 2000. All rights reserved
08.97
9
X
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Unsuitable return
movement
X
Ideal return
movement
X