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Thread: Has anyone made an EDM/Spark Eroder?

  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

  2. #2
    Join Date
    Mar 2004
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    Port Colborne,On.
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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
    Join Date
    Jun 2002
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    Grand Blanc Michigan
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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
    Join Date
    Jul 2010
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    Warrington, UK
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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

  6. #6
    Join Date
    Dec 2005
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    4,448

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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.

  7. #7
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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.

  8. #8
    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.

  9. #9
    Join Date
    Jul 2010
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    Warrington, UK
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    Quote Originally Posted by PeteF
    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
    I can achieve erosion rates of about 9mm/hour with a 3 mm tool with my set up.
    Mike

  10. #10
    Join Date
    Jun 2006
    Location
    Austin, Texas
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    Rich Carlstadt built a really nice Ben Flemming EDM, but I haven't seen Rich on here in awhile.
    "Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did."

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