Richard Mcfarlane wrote:
>Dear Moderator Mr. Curtis Richards,
> Many thanks for your useful EDM information.
>I like to buy one of the EDM books you mentioned
>below.Which one would be better? I wish to build a CNC
>Wire /Sinker EDM with PWM- EDM Power Supply:-
>1. How to EDM Book--By Mr.Ben Fleming (20 USD)
>2. S-EDM for the Homeshop--By Practice Publication
> Price -Not mentioned and from where to get this
>book?Is this the very same EDM(Robert Langlois) book
>by Home Shop Machinist? I have this book.But this is
>not a CNC EDM.
> Please let me know.
>Regards.
>Richard.
>
>
Hi again Richard,
On RE-reading your e-mail I realize I didn't really answer your main question. If you are looking to build a wire EDM which will cut parts from DXF or DWG files, you will be best served with the Fleming book with its instructions for building a tank, servo EDM head and general info on EDM. You will want to build the Garden of EDM power supply (a PWM high amperage supply). When it comes to a machine base you going to have to adapt the transport from another system.
You could use something like 3 roller belt sander configuration for the wire transport and a xy CNC table to hold your raw material ( maybe something like the ENCO 8x18 milling table with steppers fitted and driven by EMC on an old 486 or Pentium? ).
I should have my PCB burner finished by Labor Day weekend, but I am not sure how much use it will be for a wire EDM. The gap is controlled by the voltage at which the dielectric breaks down which should be adaptable to the Fleming servo system and the xy movement is controlled by a PIC with a canned stepper control program ( see Microchip AN822 and AN906 ).
I'm mostly concentrating on getting my 1954 Jeep on the road, but I'll publish my EDM results on Homebrew_PCBs as they develop.
--
Curtis W Richards
--
"The natural progress of things is for liberty
to yield and government to gain ground."
--Thomas Jefferson