Welcome to Our Community

Some features disabled for guests. Register Today.

Sphinx EDM on Applied Science!

Discussion in 'General Talk' started by Rob Taylor, Mar 12, 2019.

  1. Rob Taylor

    Rob Taylor Master
    Builder

    Joined:
    Dec 15, 2013
    Messages:
    456
    Likes Received:
    181
    Ben Krasnow got his first (in a series of, by the sound of it) EDM video up as promised and the OB Sphinx gets a starring role!



    EDM's been pretty heavily featured in my "to build" list for a couple of years or so now. I frequently seem to need to machine hardened materials, make hard internal corners, or other EDM-only features that I end up having to work around. Not having a surface grinder exacerbates the issue on the hardened stuff, too.

    Other than the Dynomotion board being kind of expensive (in essence, a $250 Arduino running 8-axis grbl- motor drivers still required), but I think that's just because it's FPGA like the Mesa boards, and possibly the high-current EDM PSU being likely much more expensive, this seems eminently doable. Not only doable, but actually pretty easy. It's a price hurdle, not a complexity hurdle, which is great.

    The paint sprayer is only a couple hundred bucks or so and I already have the same model he uses anyway (great for garage repaints, if anyone has one of those coming up this spring!:ROFL:).

    Looking forward to the other videos, looks like he's gonna do wire and sinker EDM after this!

    Edit: finish your sentences, dummy!
     
    #1 Rob Taylor, Mar 12, 2019
    Last edited: Mar 12, 2019
    Mark Carew, MaryD and GrayUK like this.
  2. Kax

    Kax Well-Known
    Builder

    Joined:
    Feb 24, 2019
    Messages:
    8
    Likes Received:
    2
    That is a drilling process I have never even knew existed. Good find!
     
  3. Rob Taylor

    Rob Taylor Master
    Builder

    Joined:
    Dec 15, 2013
    Messages:
    456
    Likes Received:
    181
    Yeah, it's pretty great. Even a simple 1-axis cylindrical sinker unit would be great for shops who regularly have to remove broken taps! Not that I'd know anything about that...

    This is the PSU. It is, as I suspected, Not Cheap: BX17 Arc Generator - €3000 is not nothing for one small part of the whole. It's cheap enough, however, that I suspect trying to DIY it wouldn't be a valuable use of time. 30A, up to 200kHz, fully controllable and programmable, frequency mode, constant energy mode, etc etc.

    That said, it makes me wonder if simply PWMing a high-current source through a high-current high frequency switch (MOSFET, IGBT, whatever is appropriate), like a TIG or stick welder (MIG is voltage controlled, no good), could sufficiently approximate the general idea to actually replace it on a temporary (or occasional usage) basis. You could still take a voltage reading off the cables to get the arc length to pass back to the controller board...
     
  4. Giarc

    Giarc Master
    Moderator Builder

    Joined:
    Jan 24, 2015
    Messages:
    1,188
    Likes Received:
    637
    I did not know I needed one of these until I saw this video.:)
     
    GrayUK likes this.
  5. joe williams

    joe williams Veteran
    Builder

    Joined:
    Nov 9, 2015
    Messages:
    100
    Likes Received:
    59
    Very interesting!
     
  6. Joe Santarsiero

    Joe Santarsiero OB addict
    Staff Member Moderator Builder

    Joined:
    Oct 30, 2014
    Messages:
    893
    Likes Received:
    191
    I was poking Kyo on YT about if they posted this on the forum yet. It's a great build, but I don't know what those electronics cost yet.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice