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B1: Continuouspath Mode, Exact Stop, LookAhead

3.4 Dynamic adaptations

Basic Functions

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

193

Suppressing G commands

G commands from G function group 59 (dynamic response mode for path interpolation) which are not intended

for use should be suppressed by the machine manufacturer via the following machine data:

MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[<n>] (list of reconfigured NC commands)

The programming of a suppressed G command leads to an alarm signal. This prevents machine data which has

not been configured with the G command taking effect.

Example:

The G commands DYNPOS and DYNSEMIFIN can be suppressed with the following settings:

MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[0]="DYNPOS"

MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[1]=" "

MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[2]="DYNSEMIFIN"

MD10712 $MN_ NC_USER_CODE_CONF_NAME_TAB[3]=" "

References

You can find further information about programming the G commands from G function group 59 (dynamic

response mode for path interpolation) in:

References:

Programming Manual, Fundamentals; chapter: "Path traversing behavior"

3.4.6 Free-form surface mode: Basic functions

Introduction

In applications in tool and mold making, it is important that the surfaces on the workpiece are as uniform as

possible. This requirement is generally more important than the precision of the surface of the workpiece.

Workpiece surfaces which lack uniformity can be attributable to the following causes, for example:

• The part program for manufacturing the workpiece contains a non-uniform geometry. This, most notably,

affects the profile of the curvature and torsion.

As a result of the lack of uniformity in geometry, the machine's dynamic response limits are reached during

processing of the part program, and needless deceleration and acceleration processes occur. Depending on

the extent of the effective over-travel of the axes, this leads to different deviations in contours.

• Needless deceleration and acceleration processes can trigger machine vibrations which result in unwelcome

marks on the workpiece.

Note

The curvature k of a contour is the inverse of radius r of the nestling circle in a contour

point (k = 1/r). The torsion is the change in curvature (first derivative).

Siemens SINUMERIK 828D Function Manual

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