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Westline
05-12-2017, 08:15 AM
Hi
I just what to share, back in 2011 I built a EDM I post on this forum I called it my Masking tape EDM http://bbs.homeshopmachinist.net/threads/47817-Busy-Week-of-success-and-failurejust a project to save parts from a tap I broke in another project.
Since then EDM has fascinated me and after 19 month I finally completed the prototype of my latest one. https://www.dropbox.com/s/kk9hr6ygqpw3214/IMG_5178.JPG?dl=0 called Sias, I even built in some Rotational axis functions no you can spark erode while turning a part
https://www.dropbox.com/s/keqxn88dygzinfx/IMG_5404.JPG?dl=0

Not sure if it counts as a tool gloat if you built it yourself.
Just thought I would share

Regards
Westline aka Kobus

Sparky_NY
05-12-2017, 09:16 AM
I would love to hear more details on your latest version. A homebrew EDM would be a welcome on-topic subject here.

Westline
05-12-2017, 09:30 AM
I would love to hear more details on your latest version. A homebrew EDM would be a welcome on-topic subject here.

To give brief run down. It all runs from a Mic Microcontroller control the spark and timing.
I tried to put as functionality in so it has a built in pump control, Since I'm using a Pic I may as well use the PWM function to control the speed.
There is also a built-in Motor driver so lets say you have a rotory table just add a Stepper motor plug it into the EDM unit and you have a rotational axis.
The spark engine itself is 85V DC max 10 A at the moment and it works fine for 0.3mm - 3mm small EDM rods or small die/sinker jobs.
It is a pulse EDM and the set pulses can be ON Pulse 100 - 999 us and OFF 200 - 999us
I have a few videos on youtube just check sias edm.

ikdor
05-12-2017, 03:03 PM
Congratulations, that looks really well done.
His website is here http://www.radnor-technologies.com/

Igor

Rich Carlstedt
05-12-2017, 03:18 PM
Yes, Home built EDM's can be a lot of fun and help out when you have a "Whooppes"
Here is my unit built from Jim Flemings Yahoo EDM Group .
The whole job cost me about $100 using surplus stock ( like the 1945 Volt meter !)

http://i273.photobucket.com/albums/jj220/StationarySteam/Shop%20Tools/EDMControl.jpg (http://s273.photobucket.com/user/StationarySteam/media/Shop%20Tools/EDMControl.jpg.html)
http://i273.photobucket.com/albums/jj220/StationarySteam/Shop%20Tools/EDMServoDrive.jpg (http://s273.photobucket.com/user/StationarySteam/media/Shop%20Tools/EDMServoDrive.jpg.html)


What do you do when you break off a stud in a 0-80 Die ?
Well, you burn it out with a .030 electrode and save the die.


http://i273.photobucket.com/albums/jj220/StationarySteam/Shop%20Tools/Burningabroken0-80stud.jpg (http://s273.photobucket.com/user/StationarySteam/media/Shop%20Tools/Burningabroken0-80stud.jpg.html)

Yes, a nice addition
Rich

I think Westline's approach is even simpler

Norman Bain
05-12-2017, 05:31 PM
For me a home made tap remover remains a work in progress.

I have leveraged the ideas and concepts of many before me in getting to this solution ... but if it works I think it can be called quite elegant if I do say so myself.

[EDIT] I give credit to this posting by DEVILHUNTER (http://bbs.homeshopmachinist.net/threads/70731) for a lot of the idea.

For sizes: The rod is 10mm. The outer tube is 1 inch cut from a section of a dead whipper snipper tube.

http://downloads.purposebuilt.com.au/NJB/EDM_TapRemover/EDM_01.jpg

More detail of the bearing and bobbin. The hole for the bearing was reamed to size then polished, while still in lathe, with some emery held in a smaller diameter rod with a slit cut in it. The rod slides "oh so nice".

http://downloads.purposebuilt.com.au/NJB/EDM_TapRemover/EDM_02.jpg

There would need to be an insulating plug added to stop the rod from rising and contacting metal at the top of stroke.

Norman

macona
05-13-2017, 03:32 AM
You could also use this type of actuator so you dont need a slip clutch: https://www.zero-max.com/ce-rohlix-linear-actuators

Lew Hartswick
05-13-2017, 09:10 AM
You could also use this type of actuator so you dont need a slip clutch: https://www.zero-max.com/ce-rohlix-linear-actuatorsI saw a chart recorder that used that for the pen drive years ago. I never knew what the name of the system was. It was some
scientific thing like a liquid chromatograph ( HPLC ) or some such. It worked very well.
...lew...

Rich Carlstedt
05-13-2017, 09:21 AM
You could also use this type of actuator so you dont need a slip clutch: https://www.zero-max.com/ce-rohlix-linear-actuators

Those are good looking units, but they cost almost 3 times what my whole project cost was.
Thanks for the info however
Rich

alanganes
05-13-2017, 09:26 AM
You could also use this type of actuator so you dont need a slip clutch: https://www.zero-max.com/ce-rohlix-linear-actuators

We are using these in an assembly at the place I work to do some fast positioning of a series of plates, in and out of a "window." They work really well and are pretty cool. I'd never seen them before. They do make a pretty awful noise when something jams the plates and the drives slip, but there is no damage done.

They are pricey, but if you happen to know somebody that has some machine tools, I'd bet they could help you make a copy....

Westline
05-13-2017, 03:48 PM
Nice looking EDM Rich, I love the full metal with the retro dial and vent at the top.

EDM is such a amazing topic I love it. I also read Ben Fleming's pluse edm and EDM how to book.
The complete EDM handbook by reliable edm is also pretty informative.

During my research I came across a white paper of a University in Japan sparking 6um wide hole with 20- 30v ..... Fair enough it takes then 1um depth per minute.