Free-Form Surface Mode: Basic Functions - Siemens SINUMERIK 828D Function Manual

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.
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).
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.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
B1: Continuous­path Mode, Exact Stop, LookAhead
3.4 Dynamic adaptations
193