CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: EDM spark control system

Posted by Jon Elson
on 2001-07-27 11:14:15 UTC
thscarince@... wrote:

> First: Thanks Jon, you answered every one of my questions!
>
> There seems to be a bit of interest in this topic...
>
> Although "officially" I'm a mechanical guy, I've got a few
> electronics tricks up my sleeve as well, so here's a few thoughts.
>
> Jon wrote:
> >an electronic switch that cuts off current
>
> It looks like the "electronic switch" would be a power transistor
> (MOSFET or bipolar) that would have to tolerate fairly high current
> pulses. Perhaps much higher than the "1/4 to 1/2 amp" average
> current. Once that parameter is nailed down, it's easy to generate
> whatever pulse rate and duration you want.

Since this is essentially a short circuit during the spark, a MOSFET would
be the best choice, as it resists secondary breakdown. i would guess
about 4 of a 25 A 100 V transistor in parallel would be a good start.
I already scribbled down a circuit with a current sense resistor (although
a transformer-type current pickup would also work) a 556 dual timer
and a MOSFET gate driver. It would have pots to adjust on and off
time, and could also output a signal to the CNC telling it when to proceed
and when to stop the feed.

I could enter this as a schematic and post it to the drop box. I'm a bit
too busy with commercial work to do any construction and testing of it
right now, but would be glad to help anyone who wanted to build it.

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