Rounding - Siemens SINUMERIK 840D sl Function Manual

B1: Continuous-path mode, Exact stop, Look Ahead
4.3 Continuous-path mode
4.3.3

Rounding

Function
The "Rounding" function adds intermediate blocks (positioning blocks) along a programmed
contour (path axes) at non-continuous (angular) block transitions so that the resulting new
block transition is continuous (tangential).
Synchronized axes
The rounding considers not only the geometry axes but also all synchronous axes. Although
a continuous block transition cannot be created for both axis types concurrently for the parallel
travel of path and synchronous axes. In this case, to favor path axes that always travel exactly,
only an approximately continuous block transition is created for synchronous axes.
Rounding for G64
Rounding is performed even when to observe the dynamic-response limits at the block
transition, a speed is required that for G64 exceeds the permitted speed at the block transition
(see Section "Velocity reduction according to overload factor (Page 186)" "Overload factor").
Impact on synchronization conditions
The use of rounding shortens the programmed blocks between which the rounding block(s)
are added. The programmed block boundary disappears and are then no longer available as
criterion for any synchronization conditions (e.g. auxiliary function output parallel to motion,
stop at block end).
Note
We recommend that when the "Rounding" function is used, synchronization conditions apply
to the end of the block before the rounding location rather than the end of the inserted rounding
block. The following block would then not be started and with a stop at the block end, the
contour of the following block can still be changed manually.
Exceptions
In the following cases, no rounding occurs at the block transition, for example, between the
N10 blocks after N20, i.e. no rounding block is added:
Implicit stopping of the traversing motion
Possible causes:
● Auxiliary function output active before the traversing motion for N20
● N20 does not contain any traversing motion for path axes
● In N20, an axis that was previously a positioning axis traverses as a path axis for the first
time
● In N20, an axis that was previously a path axis traverses as a positioning axis for the first
time
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions