Re: [CAD_CAM_EDM_DRO] Re: Machine security and safety

> ballendo wrote:
> >
> > Chris,
> >
> > Good points.
> >
> > I'm hoping you're in MDI when you're doing this.
> > Do you limit rapids, and turn the F/R over-ride down before you get
> > close?
> >
> > This brings up an issue to consider for control writers: Just what
> > can be done to increase operator safety in this type of "human
> > intervention needed" situation? Thoughts, anyone?
> >
> > (and before someone says "use a probe routine"; besides that!)
>
> How about a foot operated power switch?

I'm afraid none of these things are really any use if an encoder falls
off a motor - the broken servo loop is going to cause the motor to
take off at full speed regardless of any limits normally imposed by
the software, and on any machine with hefty drives for fast rapids the
user would probably not be able to react in time. And there won't
even be a 'following error' to shut it down unless it was supposed to
be moving when this happened.

Chris Stratton

-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html