CAD CAM EDM DRO - Yahoo Group Archive

Re: Question fro Jon Elson

Posted by scott@d...
on 2001-07-27 13:38:57 UTC
Will you give us details of your RC EDM circuit? I would like to see
how it works.

Thanks
Scott

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> thscarince@h... wrote:
>
> > Ah Ha!
> >
> > Out of curiosity I searched McMaster-Carr to see if they might
have
> > copper hex stock (electrode by the foot!). They don't, but they
do
> > carry *beryllium* copper hex wrenches for non-sparking
applications.
> >
> > No idea if the beryllium would be a problem...
>
> I wouldn't use it! The EDM fluid would be serious HAZ-MAT after
> use, and you wouldn't want to touch it. The polarity of the EDM
> circuit puts most of the erosion into the workpiece, but the
electrode
> does wear away, too. And, so, you would have finely atomized
beryllium
> floating around in the fluid.
>
> >
> > BTW, I was captivated by Jon's junkbox EDM setup! Is that really
all
> > there is to it?
>
> Well, it works! but, it isn't fast.
>
> > Does EDM require short pulses or a continuous arc
> > like a welder?
>
> It is short pulses. If a continuous arc develops, it will burn a
big hole
> in both
> the work and electrode at that spot. What you want is lots of
little sparks
>
> all over the tiny space between work and electrode.
>
> > Does polarity matter?
>
> Yes, it is the only thing that determines which is electrode and
which
> is workpiece!
>
> > How about AC?
>
> No, then the electrode and workpiece would be eroded equally.
>
> > What properties
> > are make a good electrode material?
>
> Something that resists burning away. Copper-loaded materials
(brazing rod,
> brass, copper, bronze, etc.) and graphite are favorites.
>
> Anyway, my (and many others') RC EDM circuits are slow and a bit
> temperamental.
> For the best results, an electronic switch that cuts off current
some time
> interval after the discharge starts, and then restores the power
after a
> set 'deionizing' time will give much faster cutting. You can
probably get
> 10,000 discharges a second with a pulser, and rarely more than 100
with
> the RC. But, it is simple, and it does work.
>
> Jon

Discussion Thread

mdickey@b... 2001-07-26 06:15:57 UTC Question fro Jon Elson Jerry Kimberlin 2001-07-26 06:59:31 UTC Re: [CAD_CAM_EDM_DRO] Question fro Jon Elson Jon Elson 2001-07-26 10:31:15 UTC Re: [CAD_CAM_EDM_DRO] Question fro Jon Elson Fitch R. Williams 2001-07-26 10:42:30 UTC Re: [CAD_CAM_EDM_DRO] Question fro Jon Elson Jon Elson 2001-07-26 11:06:06 UTC Re: [CAD_CAM_EDM_DRO] Question fro Jon Elson mdickey@b... 2001-07-26 11:25:25 UTC Re: Question fro Jon Elson thscarince@h... 2001-07-26 12:13:12 UTC Re: Question fro Jon Elson Alan Marconett KM6VV 2001-07-26 12:24:37 UTC Re: Question fro Jon Elson Doug Harrison 2001-07-26 15:23:27 UTC Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson brian 2001-07-26 18:37:16 UTC Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson dlm00738@j... 2001-07-26 19:42:06 UTC Re: Question fro Jon Elson Jon Elson 2001-07-26 20:23:44 UTC Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson Chris Stratton 2001-07-27 06:09:55 UTC Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson Carlos Guillermo 2001-07-27 06:22:05 UTC EDM spark control system Weyland 2001-07-27 06:31:03 UTC Re: [CAD_CAM_EDM_DRO] EDM spark control system Marcus & Eva 2001-07-27 07:55:51 UTC Re: [CAD_CAM_EDM_DRO] EDM spark control system thscarince@h... 2001-07-27 08:18:37 UTC Re: EDM spark control system Jon Elson 2001-07-27 11:14:15 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system Ian Wright 2001-07-27 11:34:27 UTC Re: [CAD_CAM_EDM_DRO] EDM spark control system Scott M. Thomas 2001-07-27 13:20:26 UTC RE: [CAD_CAM_EDM_DRO] EDM spark control system scott@d... 2001-07-27 13:38:57 UTC Re: Question fro Jon Elson mdickey@b... 2001-07-27 14:55:12 UTC Re: Question fro Jon Elson Larry Edington 2001-07-27 15:16:33 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system Carlos Guillermo 2001-07-27 17:23:34 UTC Re: EDM spark control system Tom Murray 2001-07-27 19:52:13 UTC Re: EDM spark control system Jon Elson 2001-07-27 23:26:50 UTC Re: [CAD_CAM_EDM_DRO] Re: Question fro Jon Elson Jon Elson 2001-07-27 23:39:07 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system Tim Goldstein 2001-07-27 23:59:40 UTC Temperature of a brushed servo motor? Larry Edington 2001-07-28 01:11:14 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system Ian Wright 2001-07-28 06:04:23 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system info.host@b... 2001-07-28 07:01:46 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system mariss92705@y... 2001-07-28 15:46:09 UTC Re: Temperature of a brushed servo motor? Jon Elson 2001-07-28 16:14:07 UTC Re: [CAD_CAM_EDM_DRO] Temperature of a brushed servo motor? Jon Elson 2001-07-28 16:25:29 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system brian 2001-07-28 18:01:55 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system M. SHABBIR MOGHUL 2001-07-28 23:52:09 UTC Re: [CAD_CAM_EDM_DRO] EDM spark control system M. SHABBIR MOGHUL 2001-07-28 23:52:31 UTC Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system