Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Re: BDI and servos

At 17:20 12/8/2002 -0600, you wrote:

> > Â Â From: Bob Simon <bsimon@...>
><s>
> > I have one question. Are there user available (.ini file?) parameters
> > to establish where the controller breaks smooth motion and applies a
> > deceleration/acceleration before continuing with the next block? Many
> > controllers call this "auto exact stop"


> The machining center may be put into any one of three path control
>modes: (1) exact stop mode, (2) exact path mode, or (3) continuous mode.
>In exact stop mode, the machine stops briefly at the end of each
>programmed move. In exact path mode, the machine follows the programmed
>path as exactly as possible, slowing or stopping if necessary at sharp
>corners of the path.

It looks as though the exact path mode is close to what I'm after. I wonder
what parameter the interpreter looks at to determine what is a "sharp corner".

I found this at 4.3.5.3;

<<In CANON_EXACT_PATH mode, the control keeps the controlled point on the
programmed or calculated path within the tolerance the control system can
achieve at all times. At points which are the end point of one move and the
start point of the next move, the feed rate is kept constant if possible.
It should be possible to avoid changing the rate of motion at such a
juncture if the direction of the path of the controlled point does not
change sharply at the juncture, for example if one straight move is in the
same direction as the previous one, or if a straight move is tangent to a
preceding or following arc move.>>

It sounds as though instead of checking the magnitude of an angular
departure or other parameter, the interpreter automatically figures exact
stops to fit within the following error parameters setup in emc.ini. Pretty
cool...


-Bob