Specs for EDM power supply
I want to build an EDM power supply, therefore i need some specs to come to a good design.
So the following questions arises:
AC, DC, or PWM ?
Anything else ?
It is intended for light-duty EDM. Let's say PCBs
I am able to design a processor controlled power supply.
I am willing to publish the schematic on this forum, after i have succeeded.
Thanks in advance for your replies.
From my research (currently building my own WEDM, so not actually tested)
AC: pretty advanced, used to avoid surface electrolysis, esp. for titanium.
DC: Do you mean capacitor discharge? Easy/works/slow.
PWM: Standard "DC" methord, should be reasonably simple to make.
Volts: Commercial machines seem to use 27 to 250v. Bigger voltage = easier life (larger gap) but more dangerous. Seriously, be careful.
Amps: Try it and see... more amps = faster cutting, but speed isn't your first problem.
PCB's: you also need to control the z height fairly accurately I'd think. What do you plan to use for a probe?
Are you upgrading an existing machine or starting from scratch?
To start with your last question, i'm starting from scratch.
I intended to make a pcb milling machine. Lucky enough i stumbled over EDM before i actually made the Z-axis.
Power supply: Maybe the best solution is to make a PWM-contolled one in the whole voltage range you mentioned.
I have a 4 AMP variac at home. Maybe that is a good starting point.
I found on the web a dedicated forum about DIY EMD.
For me, it is the place to be...
Thanks for your reply.
4amp variac should do it. Be careful with those voltages! Use an RCD on the mains side and have an audible and visible warning of the wire being possibly live.