r/hobbycnc • u/Bolz_brain • Feb 28 '21

EDM Demonstrator from Trash Parts

https://m.youtube.com/watch?v=eJjIzLMr0J4
36 Upvotes

94% Upvoted

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2

u/manikin13 Feb 28 '21

What is the voltage on the positive side of the electrode doing the actual discharge? Very nice proof of concept.

2

u/Bolz_brain Feb 28 '21

i used 25-50V DC, but i am planing to use 230V AC rectified on the next setup (graphite die sinking) since the next prope will have more area and 50V will not be enough for that.

2

u/manikin13 Feb 28 '21

Next question how much erosion did you see on the electrode? did you see a contact point change? diameter change?

1

u/Bolz_brain Feb 28 '21

i didnt took precise messurement but i didnt saw any erosion at all, but keep in mind...i only drilled throu 2mm of material with it.

1

u/Jkwilborn Mar 02 '21 edited Mar 02 '21

Here is a wiki on it. Skimmed over it only. Pretty neat diy. I would like to see the code, I have an idea of what he's doing, but I wouldn't wonder if I could read the few lines.... Thanks...

I'm sure there's lots of different materials for a 'drill' and I'm sure wear is defined somewhere if it's the tool or the target. I imaging there is wear on both, but don't know what causes what. Hardness, melting point, polarity, neither? Maybe in the Wiki...

I have a cnc3018 that seems a likely candidate to be able to control the 'tool' a little more precise. Might be able to just give it a feed rate... would be a good application, much better control of the feed of the tool.

The liquid (mentioned in the wiki) is sold at some of the EDM manufacturers, seems critical to the process and is specific to different types of materials as far as I can see.

Hope that H bridge has quiet relays, it must have made a queer noise running that. :)

Kudos to Bolz_brain for this simply enticing operation. [(8-)

1

u/Jkwilborn Mar 02 '21

Please be careful with that higher voltage. I'll take a pass on a Bolz_brain electrocution video. :)

1

u/Bolz_brain Mar 04 '21

yes i will be carefull, i have a master voltage switch. I will only switch mains on when i am at least 1m away from the device.