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Thread: Has anyone made an EDM/Spark Eroder?

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  1. #1
    PeteF Guest

    Default Has anyone made an EDM/Spark Eroder?

    Has anyone built a simple spark eroder type of device suitable for eroding broken taps? I wondered if a simple version could be made that wouldn't take forever to erode a tap yet would be small enough to tuck away somewhere in the workshop just waiting for one of these "Oh #$%^" moments?

    Pete

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    Quote Originally Posted by PeteF
    Has anyone built a simple spark eroder type of device suitable for eroding broken taps? I wondered if a simple version could be made that wouldn't take forever to erode a tap yet would be small enough to tuck away somewhere in the workshop just waiting for one of these "Oh #$%^" moments?

    Pete
    I have most of the parts gathered up to make the one designed by Ben Fleming, but haven't had the time to put it together yet. You can get a lot of info from the yahooedmgroups page if you're interested. ...Jim

  3. #3
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    I built the HSM's Build an EDM. It works as advertised, but I don't use it much. Most significant thing I did with it was a hole in the end of an arbor to engage a special shaped shaft. (imagine a circle or pie with one quarter removed) I duplicated the shaft in brass and plunged the brass electrode into the end of the arbor.
    Weston Bye - Author, The Mechatronist column, Digital Machinist magazine
    ~Practitioner of the Electromechanical Arts~

  4. #4
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    I think this ones been on here before.

    http://modelengineeringwebsite.com/EDM_1.html

    Regards Ian.
    You might not like what I say,but that doesn't mean I'm wrong.

  5. #5
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    http://smg.photobucket.com/albums/v8...rganmethod.mp4

    http://smg.photobucket.com/albums/v8...ingedmtest.mp4

    Yes... the di-electric fluid is as important as the capacitors.. some people use kerosene, I never could bring myself to try it.. some used tap magic.. some..

    Next version which I have not got back onto, a unit ran by old car alternator w external regulator driven by electric motor, a pot controlling field generation and the generated dc bussed into the capacitor circuits..

    When I do, I'll try to post results.. the vibrating "pen" is a great addition to keep the spark going.. it stimulates the spark by altering the gap allowing a current to build, then bringing close to spark..
    Excuse me, I farted.

  6. #6
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    Kerosene, or parraffin as we know it, was used as the standard fluid in our toolroom?

    Regards Ian
    You might not like what I say,but that doesn't mean I'm wrong.

  7. #7
    PeteF Guest

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    What sort of erosion rates are you guys getting from a simple solenoid type eroder? I think it would take an awful long time to punch down through a tap with something like that.

    Pete
    Last edited by PeteF; 05-11-2011 at 08:21 AM.

  8. #8
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    Hi Pete,
    I have made a simple spark eroder as shown here:

    http://mikesworkshop.weebly.com/a-sp...apparatus.html

    Mike

  9. #9
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    An EDM would be fun to play with--but if all you wanted to do was remove busted taps, I'd suggest that making single-edge drills from tungsten carbide blanks would be a lot easier and faster.

    A diamond wheel on a Dremel tool will grind them; when shaped properly it only takes light pressure at 200 RPM and they'll just sink right through a HSS tap.

  10. #10
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    I have the Ben Fleming book and Robert Langlois book, just out of interest. Both use RC type circuitry, meaning resistors and capacitors. They do work and are easy to build, but I like to have more control of the process than that.

    That is the reason I'm at the moment designing a pulsed type EDM electronics, I have the circuits already sketched on a paper but have to get time to prototype them and to build the actual machine to test them out. The thing has all the bells and whistles - ON/OFF times, current selector, pulsed flushing, manual and automatic modes, edge finder and what else there is in a "basic" commercial machine

    Though, I'm not publishing the work as such in a long time as I'm intending to have it published in HSM magazine and to get it as a book, but as said, it is a long way up to that.

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