Re: [CAD_CAM_EDM_DRO] Tap burning EDM? Need it Quick and Dirty ;-)

Hi, you can do a lot with modeling clay and a small piece of sheetmetal to
keep the fluid where it needs to be. cul brian f.

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, November 06, 2002 12:58 PM
Subject: Re: [CAD_CAM_EDM_DRO] Tap burning EDM? Need it Quick and Dirty ;-)


>
>
> jmkasunich wrote:
>
> >Turn, Turn, Snap... Arrgh!
> >
> >Busted an 8/32 spiral flute tap in a piece of A2 tool steel
> >last night. I want to try the EDM approach to get it out.
> >
> >I checked out Jon Elson's EDM page at
> >http://pico-systems.com/edm.html
> >
> >The electrical side is no problem, I've got a 48V 10A
> >unregulated DC supply (for my CNC shoptask project), and
> >a Variac, and enough other parts to make the sparker.
> >I've got enough electrical knowledge to avoid shocking
> >myself or frying something.
> >
> >The electrode holder is no problem, I can cook up something
> >simular to Jon's. The problem is the electrode feed. Jon
> >used his CNC mill to spin and advance the electrode. I don't
> >have a CNC mill (yet). I have a drill press that will go
> >slow but doesn't have a fine feed. I have the Shoptask mill,
> >which has a moderately fine vertical feed, but won't go slow.
> >I could also use the Shoptask lathe function, feed is better,
> >but I don't know how to keep the fluid around a horizontal
> >electrode. I could also try to build something specifically
> >for this job - a piece of 4-40 threaded rod would give a finer
> >feed than any of my machines, but gets away from the "quick
> >and dirty" approach. I don't want to spend several days
> >getting this tap out.
> >
> >It seems that anything simple that I can come up with will
> >require manual electrode feed. Is it practical to use
> >manual feed to burn out about 3/8" of a #8 tap? Or is slow,
> >smooth advance of the electrode too difficult to do?
> >
> >
> Yes, all the tap burning I've done has been manual. The CNC system
> actually did the
> moving, but I was there the whole time, pushing the jog buttons, mostly.
> Without the
> flushing of chips, I had to stop and back up very often. If you can rig
> some brass tubing
> and use an elevated can of EDM fluid, you may have much better results.
> I am going
> to do this the next time a tap needs to be burned out.
>
> As for really fine feeds, leaning on the machine may do it! I actually
> modulated the
> arc by leaning on the head of my Bridgeport mill!
>
> Jon
>
>
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