Re: [CAD_CAM_EDM_DRO] PC ports, Encoder resolution and EDM PSU info

Robert;
the articles in question are on Model Engineering Workshop magazine, and are written
by the same chap that wrote the article on the cnc mill his name is Peter Rawlinson,and the
articles in question are on issues No 52,57,and 58.Im looking at them now

regards
mariano


Robert Grauman wrote:

>
> The article you speak of was written by C. R. Amsbury, and appeared in the
> 16 July 1976 (No. 3541) and concluded in the 6 August 1976 (No. 3542) issue
> of Model Engineer. You are correct that a stepping motor was used, but no
> PC board layout is given. A commercial PC board was used to drive the
> motor. I built one, and used it successfully for a time, but it was very
> slow. This was due to the very low amperage available from the power
> supply. It operated at ~300 Volts. I eventually realized that this was a
> lethal voltage to have exposed, and I dismantled the machine. The drive
> mechanism was not well designed, and it developed rotational play. Amsbury
> published an update in the 2 October 1981 issue of Model Engineer, with a
> redesigned drive, and an operating voltage of ~40 Volts, but still no PC
> board.
>
> My bibliography of shop built EDMs includes the Strictly IC series starting
> in the August/September 1993 issue and ending in the April/May 1994 issue.
> Then there is the HSM "Build an EDM" series by Robert Langlois which was
> published as a book by Village Press. Finally, Benjamin Fleming published a
> small book describing a "Metal Disintegrator". I choose to ignore the
> Popular (Mechanics/Science?) line voltage "tap busters" as being too
> dangerous to consider.
>
> Robert Grauman in Sunny Alberta
>
> > Jon;
> > some time ago in the Model engineering workshop magazine was a project
> about a edm machine, and for what I can remember it used
> > stepper motors for lifting the electrode up and down,everything was
> described, power supply ,mechanics,and even the pcb was
> > available.
> > regards
> > mariano
>
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