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Homemade Plasma Cutter Power Circuit

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Uploaded on Dec 7, 2007

Homemade Plasma Cutter Power Circuit. This vid shows all the needed connections for the power circuit of the plasma cutter. It must be wired this way. If you put the resistor on the torch and not on the work clamp then it WILL NOT WORK. The value of the inductance changes based on your capacitors and frequency, but I have found that most any inductor that does not have much resistance works fine. Use a MINIMUM of 1000uF photo flash capacitors; wire them in parallel. Solder all these connections and use more if you can. Do not hook the caps up backwards or they WILL explode. Remember this plasma cutter is not isolated from ground so YOU AND WHAT YOU CUT MUST BE ISOLATED FROM GROUND. There is almost no measurable voltage between ground and work or tip when on dry concrete, but be safe and wear rubber soled shoes and gloves anyway. The contactor disconnects the work clamp from the power supply when not cutting for added safety. I will be building a 110 volt version when I get the time. It will as safe as any other commercial product. This cutter however, is more like the older industrial robotic cutters.

Please note this is for informational purposes only! This device is not isolated from ground and in this current version could, under correct circumstances, cause a lethal shock. This device was tested on a dry concrete slab and show a open to ground voltage of 7.3 volts.

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