Siemens SINUMERIK 840D sl Programming Manual page 329

Meaning
G64:
G641:
ADIS=... :
ADISPOS=... :
G642:
G643:
G644:
G645:
Note
Rounding cannot be used as a substitute for smoothing (RND). The user should not make any
assumptions with respect to the appearance of the contour within the rounding area. The
type of rounding can depend on dynamic conditions, e.g. on the tool path velocity. Rounding
on the contour is therefore only practical with small ADIS values. RND must be used if a
defined contour is to be traversed at the corner.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
11.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS, ADISPOS)
Continuous-path mode with reduced velocity as per the overload factor
Continuous-path mode with smoothing as per distance criterion
Distance criterion with G641 for path functions G1, G2, G3, etc.
Distance criterion with G641 for rapid traverse G0
The distance criterion (= rounding clearance) ADIS or ADISPOS
describes the maximum distance the rounding block may cover before
the end of the block, or the distance after the end of block within which
the rounding block must be terminated respectively.
Note:
If ADIS/ADISPOS is not programmed, a value of "zero" applies and the
traversing behavior therefore corresponds to G64. The rounding
clearance is automatically reduced (by up to 36%) for short traversing
distances.
Continuous-path mode with smoothing within the defined tolerances
In this mode, under normal circumstances smoothing takes place
within the maximum permissible path deviation. However, instead of
these axis-specific tolerances, observation of the maximum contour
deviation (contour tolerance) or the maximum angular deviation of the
tool orientation (orientation tolerance) can be configured.
Note:
Expansion to include contour and orientation tolerance is only
supported on systems featuring the "Polynomial interpolation" option.
Continuous-path mode with smoothing within the defined tolerances
(block-internal)
G643 differs from G642 in that is not used to generate a separate
rounding block; instead, axis-specific block-internal rounding
movements are inserted. The rounding clearance can be different for
each axis.
Continuous-path mode with smoothing with maximum possible
dynamic response
Note:
G644 is not available with an active kinematic transformation. The
system switches internally to G642.
Continuous-path mode with smoothing and tangential block transitions
within the defined tolerances
G645 has the same effect on corners as G642. With G645, rounding
blocks are also only generated on tangential block transitions if the
curvature of the original contour exhibits a jump in at least one axis.
Path action
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