Siemens SINUMERIK 840Di Function Manual page 163

ADIS or ADISPOS is therefore reduced to the remaining 40% of the distance to be traversed.
This algorithm prevents a rounding block being inserted for a very small change in contour.
In this case, switchover to continuous-path mode G64 is automatic until rounding blocks can
be inserted again.
Selection and deselection of rounding blocks
Program code G641 can be inserted in any NC part program block to modally select
rounding according to a path criterion. Before or on selection, the path criteria
ADIS/ADISPOS must be specified.
Continuous-path mode G641 can be
• Interrupted non-modally by selecting exact stop G09
• Deselected by selecting exact stop G60
• Deselected by selecting velocity drop G64
Rounding with axial tolerances
In addition to rounding using the command G641, rounding with axial tolerances enabled
modally using G642 is possible.
In this case, instead of rounding being performed within a defined ADIS range, the axial
tolerances defined with machine data
MD33100 COMPRESS_POS_TOL
are used.
The mode of operation is otherwise identical to G641.
References:
/PG/ Programming Guide: Fundamentals
Extensions
G643 is not used to generate a separate rounding block, but axisspecific blockinternal
rounding movements are inserted.
The expansions described below refine the response with G642 and G643 and "rounding
with contour tolerance" is introduced. "
When rounding with G642 and G643, the maximum permissible deviations of each axis are
normally specified.
Machine data:
MD20480 SMOOTHING_MODE
can be used to configure rounding with G642 and G643 so that instead of the axis-specific
tolerances, a contour tolerance and an orientation tolerance can be specified.
In this case, the tolerance of the contour and of the orientation is set using two independent
setting data, which can be programmed in the NC program. This means that different setting
data can be specified for each block transition.
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Detailed Description
2.3 Continuous-path mode
2-15