Re: [CAD_CAM_EDM_DRO] cheap edm tap buster?

Thanks Jon - I think i'll give it a bash. As you say,
one doesn't (or rather shouldn't!) break taps every
day, but it makes a nice cheap emergency tool.

Regards,

Brian

--- Jon Elson <elson@...> wrote:

> electromodeler wrote:
>
> >Hi group, I came across this page while browsing
> about. Seems do-able
> >on a small budget, but are the electronics sound?
> It seems too simple.
> >Perhaps someone with a bit more knowledge can check
> it out? web page
> >is http://www.pico-systems.com/edm.html
> >
> >
> Electronics? All there is is a rectifier. It IS
> too simple, and so it
> is VERY slow.
> Also, it requires a VERY fine feed, often achieved
> by leaning on the machine
> (A Bridgeport mill in my case). But, for small
> taps, at least, it DOES
> work. It can
> take an hour or more to burn out one 6-32 or 4-40
> tap, so it depends on
> how much
> work you have in the workpiece, or the value of the
> piece of metal.
>
> A pulser system would speed up the metal removal a
> great deal. One of these
> days, I really want to build one, but I don't burn
> out taps real often.
> Also, there's
> no closed-loop control of the electrode gap, so I
> had to babysit the
> thing the whole
> time.
>
> Also, a flushing system with a hollow electrode
> would help a lot, I
> think the lack
> of flushing was a major deficiency in that setup.
>
> Jon
>

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