Siemens SINUMERIK 840D sl Function Manual page 225

Applications
The function is used to process workpieces which primarily comprise free-form surfaces.
Requirements
The function can only be activated if the requisite memory capacity is reserved during memory
configuration:
MD28610 $MC_MM_PREPDYN_BLOCKS = 10
The value entered prescribes the number of blocks which have to be taken into consideration
in the determination of the path velocity (velocity preparation).
A sensible value is "10".
If MD28610 has a value of "0", only the motions of the axes in a particular block are taken into
consideration when determining the maximum velocity of the path for that block. If the geometry
of neighboring blocks is also taken into consideration when determining the velocity of the path
(value > 0), a more uniform profile in path velocity is achieved.
Activation/deactivation
The function can be switched on or off independently for every dynamic response mode (see
Section "Dynamic response mode for path interpolation (Page 222)"):
MD20606 $MC_PREPDYN_SMOOTHING_ON[<n>] = <value>
Index <n>
Note
Due to the additional storage requirements, the function should only be activated in the relevant
processing channels.
Parameterization
Change in the contour sampling factor
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Dynamic response mode
0 Standard dynamic response set‐
tings (DYNNORM)
1 Positioning mode, tapping
(DYNPOS)
2 Roughing (DYNROUGH)
3 Finishing (DYNSEMIFIN)
4 Smooth finishing (DYNFINISH)
B1: Continuous-path mode, Exact stop, Look Ahead
<value> Free-form surface mode: Basic func‐
tions
0 Off
1 On
0 Off
1 On
0 Off
1 On
0 Off
1 On
0 Off
1 On
4.4 Dynamic adaptations
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