Siemens SINUMERIK 828D Programming Manual page 346

Path action
11.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS, ADISPOS)
LookAhead predictive velocity control
In continuous-path mode the control automatically determines the velocity control for several
NC blocks in advance. This enables acceleration and deceleration across multiple blocks
with almost tangential transitions.
Look Ahead is particularly suitable for the machining of movement sequences comprising
short traverse paths with high path feedrates.
The number of NC blocks included in the Look Ahead calculation can be defined in machine
data.
Continuous-path mode with smoothing as per distance criterion (G641)
With
clearance
rounded. Within this rounding clearance, the control is free to ignore the path construct and
replace it with a dynamically optimized distance.
Disadvantage: Only one
The effect of
plane.
Like
a high degree of curvature are approached at reduced velocity.
Example:
346
, the control inserts transition elements at contour transitions. The rounding
G641
(or for
ADIS ADISPOS
ADIS
is similar to
G641
, works with LookAhead predictive velocity control. Corner rounding blocks with
G64 G641
) specifies the maximum extent to which the corners can be
G0
value is available for all axes.
; however, it is not restricted to the axes of the working
RNDM
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals