Siemens SINUMERIK 828D Function Manual page 195

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Table of Contents

Activation/Deactivation

The function can be switched on or off independently for every dynamic response mode (see "Dynamic response

mode for path interpolation [Page 191]"):

MD20606 $MC_PREPDYN_SMOOTHING_ON[<n>] = <value>

Dynamic response mode

Standard dynamic response

settings (DYNNORM)

Positioning mode, tapping

Roughing (DYNROUGH)

Finishing (DYNSEMIFIN)

Smooth-finishing (DYNFINISH)

Due to the additional storage requirements, the function should only be activated in the

relevant processing channels.

Parameter assignment

Change in the contour sampling factor

The secant error which occurs during the interpolation of curved contours is dependent on the following factors:

Interpolation cycle (display in the MD10071 $MN_IPO_CYCLE_TIME)

Velocity with which the relevant contour is traversed

The max. possible secant error is defined for each axis in the machine data:

MD33100 $MA_COMPRESS_POS_TOL (maximum tolerance with compression)

If the set interpolation cycle is not sufficiently small, the max. path velocity may be reduced in the case of

contours with greater curvature. This is necessary for ensuring that the surface of the workpiece is also produced

with an adequate degree of precision in this case.

By changing the contour sampling factor, the time interval with which a curved contour is sampled in the

interpolator (contour sampling time) can be set at variance with the interpolation cycle. A contour sampling time

which is shorter than the interpolation cycle can prevent a reduction in path velocity in the case of contours with

greater curvature.

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

B1: Continuouspath Mode, Exact Stop, LookAhead

Free-form surface mode: Basic

3.4 Dynamic adaptations

Sinumerik 840d sl