Re: Machine security and safety

Chris,

Two quotes came to mind reading your post:

"Do not let what you cannot do interfere with what you CAN do"

(so keep good maintennance of those encoder mounts and cables!)

And "all you can do is all you can do, but all you can do is enough"
-A.L. Williams

(be careful, cautious, but not full of fear; for best safety)

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., ccs@m... wrote:
>
> > 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
>