DIY EDM BUILD
This is my documentation of my DIY electric discharge machine (EDM) build and not a step by step instruction on how to build your own EDM. The build is still in progress and is missing almost all safety features. There are High voltages (can be 2-3 times the supply voltage) and High currents. Therefore, building an EDM can be dangerous to you and other people, also to nearby electronic devises. If you build your own EDM whether you use or not my documentation, you are responsible for all consequences of it. (You have been warned).
Small project update/picture
Slowly but surely EDM project is getting forward. If any questions Leave comment to my youtube channel!
Electric discharge machine #3 EDM block diagram
Block 1:
In block one we have two 55V 6,5A power supplies connected in series to give 110V 6,5A.
Block 2:
Short circuit protection is done by using PTC-fuse. Although this only protects in situations where short circuit currents are large and do not protect in low short circuit current situations.
Block 3:
In bloc three has multiple different sises of caps that are used to create low impedance current source.
Block 4:
Spark
Block 5:
The current sensing. This is done by using HALL-sensor. Although this could be done using current transformer or shunt resistor.
Block 6:
The Current limiting resistor. The main purpose is to limit the shot circuit current to less then the power supply can output. Although higher pule currents can be used then maximum currents power supply can give by using Block 3. (not recommended)
Block 7:
In this case 8 mosfets are used in groups of 4.
Block 8:
Two mosfet drivers.
Block 9:
Opto isolation for the mosfet drivers control signal.
Block 10:
The controller in this case is done by using ARM. Of-course this can be done using Arduino or any other micro controller.
Block 11:
The stepper motor controller is dependent on use case, in sinker EDM basic stepper motor and driver can be used. Biggest consideration is stepping resolution/distance movement resolution, this needs to be very fine.
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