HEIDENHAIN TNC 410 - Manual (Page 120)

107 HEIDENHAIN TNC 410
7.4 Miscellaneous Functions for
Contouring Behavior
Smoothing corners: M90
Instead of M90, you should use the function M112 (see
further on in this chapter). Old programs can however be
run with M112 and M90 combined.
Standard behavior
The TNC stops the tool briefly in positioning blocks without tool
radius compensation. This is called an accurate stop.
In program blocks with radius compensation (RR/RL), the TNC
automatically inserts a transition arc at outside corners.
Behavior with M90
The tool moves at corners with constant speed: This provides a
smoother, more continuous surface. Machining time is also
reduced. See figure at center right.
Example application: Surface consisting of a series of straight line
segments.
Effect
M90 is effective only in the blocks in which it is programmed with
M90.
M90 becomes effective at the start of block. Operation with servo
lag must be active.
Independently of M90, you can define a limit value via
machine parameter MP7460 up to which the tool moves
at constant path speed (effective with servo lag and
feedforward control).
X
Y
X
Y
7.
4 Miscellaneous F
unctions f
or Cont
our
ing Beha
vior