Siemens SINUMERIK 828D Programming Manual page 456

Path traversing behavior
8.1 Tangential control (TANG, TANGON, TANGOF, TLIFT, TANGDEL)
Further information
Defining following axis and leading axis
TANG
A coupling factor specifies the relationship between an angle change on the tangent and the
following axis. Its value is generally 1 (default).
Limit angle using the 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:
To do this, limit the working area of the following axis (
be active at the instant of path reversal (
area limit, an attempt is made to return to the permissible working area with the negative
offset angle.
Insert intermediate block at contour corners (TLIFT)
At one corner of the contour the tangent changes and thus the setpoint position of the
following axis. The axis normally tries to compensate this step change at its maximum
possible velocity. However, this causes a deviation from the desired tangential position over
a certain distance on the contour after the corner. If such a deviation is unacceptable for
technological reasons, the instruction
corner and to rotate the following axis to the new tangent direction in an automatically
generated intermediate block.
The path axis is used for turning if the following axis has been used once as the path axis.
A maximum axis velocity of the following axis can be achieved with function
TFGREF[<axis>]=0.001
If the follow-up axis was not previously traversed as a path axis it is now traversed as a
positioning axis. The velocity is then dependent on the positioning velocity in the machine
data.
The axis is rotated at its maximum possible velocity.
456
is used to define the following and leading axes.
.
,
G25 G26
). If the offset angle lies outside the working
WALIMON
can be used to force the control to stop at the
TLIFT
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
). The working area limit must
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