7 Programming: Miscellaneous functions
138
7.4 Miscellaneous Functions for Contouring Behavior
7.4 Miscellaneous Functions for
Contouring Behavior
Smoothing corners: M90
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.
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Hkap7.pm6 30.06.2006, 07:03138
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