CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info

Posted by diazden
on 2000-09-05 17:32:11 UTC
Jon;
some time ago in the Model engineering workshop magazine was a project about a edm machine, and for what I can remember it used
stepper motors for lifting the electrode up and down,everything was described, power supply ,mechanics,and even the pcb was
available.
regards
mariano


Jon Elson wrote:

>
> dave engvall wrote:
>
> > > Tim Goldstein wrote:
> > >
> > > > played with EDM by hooking up a 48 V 10 amp transformer through a
> >
> > > > bank of power resistors and then a cap.
> >
> > It is my understanding that one really needs a base voltage of about
> > 28-32 V at reasonable amperage plus a spike of approx 90 V to
> > breakdown the dielectric.
> > I've done a little fooling around but after modeling the process using
> > the POCO CD am convinced that one need a good supply with
> > var. pulse freq.
> > If anyone has plans for a supply I'd give it a try. I have a handful
> > of 15 A igbt to try on something.
>
> I made a mini-EDM system for burining out taps, etc. I did a couple
> broken taps
> using about 30 VDC, a 30 Ohm resistor and about 3 uF of capacitor right
> across
> the EDm electrodes. There might be a small spike from the inductance in
> the wire,
> but the behavior I saw was an arc that repeated about 50 - 100 Hz. So,
> I believe
> the cap drains energy into the arc, the arc is suppressed by the EDM
> fluid, the
> resistor charges the cap back to near the raw DC supply voltage, and
> then the
> EDM fluid breaks down and a new arc forms.
>
> There were no semiconductor switches at all, and it worked quite well.
> Now, you
> might be able to get stable cutting on a much wider electrode, or faster
> cutting
> with electronic switching of the arc, but it is not necessary to make
> the process
> work. This may well be necessary for wire EDM, to prevent welding the
> wire
> to the work, or just burning it away.
>
> Jon
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
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Discussion Thread

William Scalione 2000-09-01 16:59:38 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Jon Elson 2000-09-01 22:35:05 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? bfp 2000-09-02 09:28:17 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Jon Anderson 2000-09-02 11:09:29 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Dennis Fielder 2000-09-02 11:39:11 UTC PC ports, Encoder resolution and EDM PSU info Alan Marconett KM6VV 2000-09-02 12:14:00 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Tim Goldstein 2000-09-02 15:04:06 UTC RE: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Paul Corner 2000-09-02 16:12:25 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info William Scalione 2000-09-02 17:10:16 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Jon Elson 2000-09-02 23:16:40 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Jon Elson 2000-09-02 23:33:00 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Ian Wright 2000-09-03 02:55:47 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info dave engvall 2000-09-04 10:44:14 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Dennis Fielder 2000-09-04 15:14:46 UTC RE: [CAD_CAM_EDM_DRO] Spindle Encoder resolution Jon Elson 2000-09-04 23:20:07 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Jon Elson 2000-09-04 23:41:07 UTC Re: [CAD_CAM_EDM_DRO] Spindle Encoder resolution diazden 2000-09-05 17:32:11 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Robert Grauman 2000-09-05 19:25:26 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Jon Elson 2000-09-05 21:56:04 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Ian Wright 2000-09-06 01:13:47 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Ron Ginger 2000-09-06 06:09:08 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Ian Wright 2000-09-06 12:46:26 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info diazden 2000-09-06 16:25:24 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info diazden 2000-09-06 16:31:58 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Robert Grauman 2000-09-06 20:03:52 UTC Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info Kenn Danner 2000-09-15 10:43:51 UTC Re: [CAD_CAM_EDM_DRO] EMC in 10 minutes??? Lee Studley 2000-09-27 10:20:35 UTC Re: EMC in 10 minutes??? Any updates? Dan Falck 2000-09-27 16:01:04 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Lee Studley 2000-09-27 17:16:49 UTC Re: EMC in 10 minutes??? Any updates? PMeinhard@a... 2000-09-27 23:25:58 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Dan Mauch 2000-09-28 07:30:13 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Dan Eaton 2000-09-28 12:03:06 UTC Re: EMC in 10 minutes??? Any updates? Matt Shaver 2000-09-28 12:10:20 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? James Owens 2000-09-28 19:03:19 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Ian Wright 2000-09-29 02:27:28 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? James Owens 2000-09-29 12:07:41 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Lee & Chris studley 2000-10-07 10:45:52 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Dan Falck 2000-10-07 11:51:51 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Lee Studley 2000-10-07 12:16:19 UTC Re: EMC in 10 minutes??? Any updates? Anne Ogborn 2000-10-08 12:41:44 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? wanliker@a... 2000-10-08 17:49:24 UTC Re: [CAD_CAM_EDM_DRO] Re: EMC in 10 minutes??? Any updates? Bob Bachman 2000-10-08 19:15:10 UTC [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Matt Shaver 2000-10-08 20:53:06 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? bfp 2000-10-09 03:22:34 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? William Scalione 2000-10-09 08:59:48 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Matt Shaver 2000-10-09 09:41:52 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Ian Wright 2000-10-12 01:34:42 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Ray 2000-10-12 09:31:25 UTC Re: Re: EMC in 10 minutes + 6 hours + ? bfp 2000-10-12 11:46:32 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? bfp 2000-10-12 12:25:07 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Ian Wright 2000-10-13 01:17:54 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Bob Bachman 2000-10-13 19:17:19 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Matt Shaver 2000-10-13 20:34:31 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ? Ian Wright 2000-10-14 02:21:14 UTC Re: [CAD_CAM_EDM_DRO]EMC in 10 minutes + 6 hours + ?