Siemens SINUMERIK 802D sl Function Manual page 383

Corner in the path contour
If the path specified by the leading axes has a corner, jumps in the direction of the path
tangent occur at this point. In this situation, the following responses can be selected for the
following axis:
● Without programming TLIFT (see Section: Use of "Tangential control" function): The path
● If TLIFT has been programmed, an intermediate block is inserted at any corner whose
Information
In blocks with G641 rounding, no intermediate block is generated for the following axis with
TLIFT. An intermediate block is not required in this case. The compensation of the following
axis is performed in conjunction with the rounding operation.
Hidden corner in space
A corner relevant for the tangential follow-up control can be hidden in space. The projection
of the contour on the plane defined by the two leading axes is relevant. If there is a hidden
corner in space, an intermediate block is inserted before the block causing the tangential
jump. This intermediate block moves the following axis to the new position. The block
transition is not rounded.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
velocity is reduced to such an extent that the following axis reaches its new alignment
synchronously with the target position of the leading axes.
angle is greater than MD37400 EPS_TLIFT_TANG_STEP (tangential angle for corner
recognition). In this inserted intermediate block, the rotary axis is moved as fast as
possible to the position corresponding to the tangent after the corner. The limit values set
for this axis are not violated. At the beginning of the intermediate block, the path velocity
of the leading axes is zero.
22.2 Characteristics of "Tangential control" function
Tangential Control (T3)
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