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"Light Bulb" EDM ???
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mueller914
In the latest issue of one of the home shop Machine mags, they had a
feature with a home built EDM which for some reason used light bulbs (controlling the freq. I guess) anyone have more detailed plans for the electrical side of this project or point me in the right direction? I have a few broken exhaust studs that I'd like to remove myself Thanks, Mike |
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Light bulbs are low cost high wattage and low resistance resistors. I looked
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at it quickly and it seems the light bulb was serving as a current limit resistor for when the electrode shorts out. Tim [Denver, CO] ----- Original Message -----
In the latest issue of one of the home shop Machine mags, they had a |
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Corey
I've built it, it works but VERY slowly. I would only
use it again after eliminating all possible mechanical solutions. The light bulbs are to limit peak current (they are in series). I posted the plans to one of the Yahoo groups last year, I don't remember which and I no longer have them on my drive. c --- mueller914 <mmueller@...> wrote: In the latest issue of one of the home shop Machine__________________________________________________ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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You can also check out this site.
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At 07:50 PM 10/24/2002 +0000, you wrote:
In the latest issue of one of the home shop Machine mags, they had a |
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Country Bubba
Check with Dan Mauch at:
as he has an excellent set of plans! "Usual disclaimer, only a satisfied customer" At 09:11 PM 10/24/02 +0000, you wrote: So what is my "safe" alternative for a DIY sinker EDM?Bubba OLDER THAN DIRT Country Bubba (Actually the inventor of Country and Bubba) axtein@... LaGrange, GA |
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Marv Frankel
Mike,
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I know absolutely nothing about EDM, but in one of my former lives, I was somewhat of an expert in removing broken studs from truck engines, aircraft engines, and even broken spark plugs. Sometimes you have to worrry the hell out of the broken part, but most of the time they come out, either the whole stud, or in pieces. If you want me to walk you through some removal scenarios, email me off list. Marv Frankel Los Angeles dcdziner@... ----- Original Message -----
From: "Scott A. Stephens" <sstephenssprint020@...> To: <CAD_CAM_EDM_DRO@...> Sent: Thursday, October 24, 2002 2:37 PM Subject: Re: [CAD_CAM_EDM_DRO] "Light Bulb" EDM ??? You can also check out this site.aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Hi Mike,
I first heard of this from Don Lancaster. See: and In the light bulb version, the bulbs act as dynamic current regulators when the spark gap is lost from contact. All the best, James --- In CAD_CAM_EDM_DRO@y..., "mueller914" <mmueller@n...> wrote: In the latest issue of one of the home shop Machine mags, they hada feature with a home built EDM which for some reason used lightbulbs (controlling the freq. I guess) |
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mueller914 wrote:
So what is my "safe" alternative for a DIY sinker EDM?FOr the power supply, I have made a slow, but functional EDM for burning out small taps. See for my info on that. For larger jobs like your exhaust studs, you could turn up the current a good deal. But, it should be possible to drill these studs out to near the root diameter of the threads, and then pick the remaining metal apart in a few minutes. There are special left-handed drills for this purpose. I would never use such a contraption, and I'm pretty blas about such hazards, usually.Be aware that this unit has no line isolation built in, and can beextremelydangerous. At the very least, use an isolation transformer. But, I had much better results with about 30 V DC. Jon |
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Franco Candido
Hello Mike I have two full size EDM's Japax, plus mills. But when it
comes to taking out exhaust manifold studs that are really rusted in there. I have found a rust disolving solution that is fantastic. All you do is heat it up a little, I used an old kettle, you don't have to boil the water based rust remover, just warm or hot. This speeds up the process, and within 24hrs. the studs can be removed with just your fingers. The rust remover only disoles the rust and goes right between the threads. I used to spend hours just setting up the manifolds to remove the studs, not any more. Franco Candido candidomold@... From: mueller914 <mmueller@...> To: <CAD_CAM_EDM_DRO@...> Sent: Thursday, October 24, 2002 12:50 PM Subject: [CAD_CAM_EDM_DRO] "Light Bulb" EDM ??? In the latest issue of one of the home shop Machine mags, they had aaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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Raymond Heckert
Franco,
Please enlighten us further. What is the name of the rust-disolving fluid? Do you know if it's available internationally? This is probably, now an O.T. post, so please respond to me directly: RayHex jnr@... ---------- From: Franco Candido <candidomold@...>mills. But when it comes to taking out exhaust manifold studs that arereally rusted in there. I have found a rust disolving solution that is fantastic.All you do is heat it ....... |
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John
Rust dissolving fluid is tartanic acid based. It's _exactly_ the same stuff
in the coke your kids and I drink too much of. I don't know if there's a high enough concentration of it to work in coke though. I bought some from an auto shop and it's a greeny coloured gel. You just paint it onto the areas, leave it for ten or so minutes, then agitate it with a scouring pad, toothbrush or paintbrush. You can then leave it a while longer or wipe it off and apply a new layer. After a little while the gel looses it's dissolving ability. For light scaling of rust it might take one go to get it clean and another to shiny. For really heavy rust it'll take a few. The more you can scrub off first the better. Although it doesn't attack the clean metal like it does the rust, it seems to leave a slightly dull appearance on the surface. All the best, John H. Franco,aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill |
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