Re: [CAD_CAM_EDM_DRO] Re: Charging Capacitors

----- Original Message -----
From: "oldpayphones" <larry@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, June 08, 2006 4:12 AM
Subject: [CAD_CAM_EDM_DRO] Re: Charging Capacitors


> Mariss,
> You know you are absolutly right. The more I think about it the more
> I realize that a catastrophic cap failure would probabily damage
> electronics downstream. I was just thinking that the cap would start
> leaking goo and have to be replaced. My bad.
> The caps I have came out of a BP mill made in 1975 and have been
> idle for about a year. I presume they are the originals. I also
> thought re-forming the caps was to condition them for use if they
> have been idle for a period of time. I am not trying to "beat a dead
> horse", just trying to see if these are usable and functioning
> normally.
> As I haven't had much experiance with this type of work I am forced
> to rely on reading white papers and the help of others. That by the
> way I appreciate very much. It seems I can't even read a DMM
> correctly. Just wait till I try to run this $100 ocilliscope I just
> bought (should have bought caps with that $100). Anyway I enjoy
> learning new things and that is one reason I undertook this CNC
> project.
> Where can I buy 36,000UF worth of 250VDC caps reasonably. I would
> prefer a quality product.
>
> Thanks,
> Larry Olson
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
> <mariss92705@...> wrote:
> >
> > OK, shoot me afterwards. I won't complain much.
> >
> > What's this with "reforming cpacitors" and such? You have a bad
> cap,
> > throw it in the trash where it belongs. Buy a new one.
> >
> > What made it go bad in the first place? You think "reforming" it
> or
> > whatever will make it OK? It was either old or defective or dried-
> > out. Aluminum electrolytics use a water-based electrolyte. This
> > electrolyte dries out after 20+ years. You cannot replace it.
> Nothing
> > you do will restore a dried-out cap to good as new health. It will
> go
> > bad again and again when you put in service after "reforming".
> >
> > Whatever you have attached to this limping cripple of a capacitor
> may
> > get damaged as a result of it dying again. And it will; remember,
> it
> > was dead when you "reformed" it.
> >
> > Geez,.. spend the bucks, get a new cap and just move on. The
> biggest
> > one can't cost more than twenty bucks.
> >
> > OK, I have my blindfold on and I'm smoking pre-execution
> cigarette.
> > My hands are tied behind my back and I'm ready for the firing
> squad.:-
> > )
> >
> > Mariss
> >
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, wanliker@ wrote:
> > >
> > > Dave we have no argument, it is just that I like to handle them
> a
> > little
> > > more gently, but I learned a long time ago to keep one hand in
> my
> > back pocket.
> > > But I did want to point out that a high discharge rate stresses
> the
> > entire
> > > capacitor.
> > > bill
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>
>
>
>
>
>
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