Re: [CAD_CAM_EDM_DRO] Re: Charging Capacitors

Larry,

I would look over on Ebay. At that voltage, they will be expensive through an electronics house..

Ron

P.S. I tried to trim this post (highlight, backspace), Yahoo doesn't seem to allow it on a reply now..

oldpayphones <larry@...> wrote:
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]
> >
>

[Non-text portions of this message have been removed]