Homemade plasma cutter torch water resistor

[yellowmetalcyborg]

Is it possible to use copper acetate instead?

[vambreace]

i actually build one and i can cut 3/8" like bluffer at 120v i found a 4000w transformer. i some calculations and rewind like a inrush type transformer for current limiting works very well, i have a very stable arch, but im researching for make a most quick arch start if your torch not have internal pilot arch connection is some tricky to manage the starting. if you put too close from the work piece it will to eat the pilot arching and turn some tricky

[UTubeisSHIT523441]

Of course the resistance in halogen bulbs, varies greatly with temperature(up to 800!!!%) so you need to have a constant current but if you put all together in some kind of enclosure it would be alot more practical, wut you think?

[UTubeisSHIT523441]

Hmm, for the resistor, wouldn't it be best to just take the halogen bulb(or any other high power bulb)..

Because that's what I do, whenever I have a need the high-power resistor. I have calculated and the 1000W halogen bulb have a resistance of about 57,6Ohm(of course the resistance greatly varies, with the current that flows through), so If you connect the two 1000W halogen bulb, you will have 115,2Ohm 2000W resistor. If you want more than that then take 4X2000W light bulbs.

[coilsinamotor]

i think zinc sulfate might work

[marieomagpie]

why couldn't you put the water resistor on the input to the bridge?, then you would not need copper sulfate. just regular salt.

[maddkraut03]

great job on the plasma torch.

[SupermaxCNC]

DO NOT BUILD THIS! IT IS A DEATH TRAP!

By code and law plasma cutters are required to have their output isolated from mains power. This means that there is a isolation transformer in between the mains and the input rectifier.

If you were to come in between ground (Lets say kneeling on wet pavement) and the tip it would kill you in a split second. There are NO safeties in this machine.

[Mrpsychotehpyro]

@SupermaxCNC Wayne ?

[GeeBeeElectronics]

What about using a variable autotransformer

at the input line voltaje to limit the current at the output.

P.S.

Very clean presentation, thankyou.

[cheaphardwarez]

There are other options to a water resistor, but none are cheaper and cheap was the focus of this design. PWM with an inductor is next or inductive reactance.

[leCaap]

Actually i tried making one of these in a school project. I managed to achieve a 100 ohm with CuSo4 and deionized water but unfortulately the Cu-conductors seemed to be oxidating in the water and the result was that the ohm constantly increased, making this a very instable resistor!

[cheaphardwarez]

Humm Go figure.. I have been using this same setup for three years now.

[4freenrg]

You solved a problem I have been working on. Thanks! 5 stars.