How to Make Your Own Plasma Cutter....




About: Hi I'm Joe and welcome. I love to make Homemade Tools & More. I will have many things to put on the instructables for you to gander at. I hope you enjoy there educational value and have fun. Come se my h...

Check out new video of the Plasanator on

This Ebook is designed for Guys and Gals who like to create tools and machinery.

I hope my Ebook gives you hope that no matter how hard a project may seem, keep plugging away until you finish and you will succeed.

I spent 3 years putting this together and now finally all my hard work and research has paid off.

I studied diagrams from commercial venders, but to no luck. They tend to leave a lot out – on purpose - so it’s hard to reproduce their design. I’ve see different attempts at people making their own on You Tube and other sites, but what a death trap. Messy water resistors and wiring like a darn Christmas tree.

So I began reading books and articles on their workings and took my home schooled-knowledge of electronics to build my own plasma cutter. I was determined; failure was not an option.

I started by collecting parts from old microwaves, stoves, water heaters, air conditioners, car parts and more in the hopes of creating a low budget way to create a plasma cutter for myself. I mounted it all on a simple piece of scrap wood; well it’s scrap wood now. We, didn’t need that table anyway (shhhhhhh don’t tell the wife).

Then one day it all came together. I hit the power switch, placed the head to the metal, started the arc, felt the air kick and then a second hard kick (the current being drawn into play). Then BAM, it was slicing through quarter inch steel like a hot knife through butter.

How sweet it sounded! I felt the amazement of completing a project that I just couldn’t let go of.

So, take your time, enjoy and be safe.

The Plasmaman


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Step 1: Assembly

When I started assembling my cutter, I began with taking a good look at my parts. As shown in Section 5 and Section 6, my parts are laid out so I can begin checking off from my parts list. Once this was accomplished, I would study each the parts pictorial to get familiar with each part/component and they would be placed.

The next step was to study my schematic and create a layout diagram. My board layout diagram is the most valuable piece in the building, repairing, and modifying process of my cutter.

As I began mounting my parts, I organized my board into four sections. Those sections are Power Control, High Current DC, Low Voltage DC and High Voltage Arc Start.

Power Control
3KVA step down transformer and contactor. The transformer is mounted off board because it is big and heavy, as you can see in Section 13. The contactor became my first part on the board. I wired it so when the head trigger is pressed, it turns the contactor on and allows my DC components to come on line. Then I began with my next system, High Current DC.

High Current DC
Bridge Rectifier
Large Capacitors
Reed Switch (which I used as a current sensor), what it does is allow the high voltage arc system to fire and as soon as high current starts to travel to the head and cutting starts it shuts down the high voltage arc system while cutting since it’s not needed at this point.
If you lose your fire it restarts the arc and gets you going again automatically.
My next system was placed on board.

Low Voltage DC
The low voltage DC components are mixed with power switch and 120 volt terminals.
Power Switch
120-volt terminal blocks
12 volt transformer
Low voltage bridge rectifier
Auto relays
Terminal strip, 4 position is all I needed but 5 position was what I had in my toy box.

High Voltage Arc Start
Microwave capacitor or run capacitor, a household dimmer switch rated for 15 amps. A Ford or Chevy ignition coil. I used the Chevy on this cutter. As you can see, I have terminals to all parts that get an external connection outside of their system so all I have to do is run a piece of wire in-between. Now look at the pictorial of board mounted parts in Section 11. It shows all the wires on the board, but here you can see all terminals and parts mounted, as I wanted. When wiring all my components, I used my Chevy board layout diagram to run my wires.

I checked and re checked all wires before mounting external parts. If you go to the final wiring section, you will also find pictures of my rigging of these parts. I could have done it many different ways, but this is what I chose at this time.

It took me about 3 hours of procrastination to finally assemble it all. You know how it is on a project, once you are ready with all your parts, your mind starts giving you a million ways of doing something. And, at last you just pick a way and go with it.

Once I got it all together, I connected my air tank hose and put the pressure setting at 28 for a safe point to start. I fired it up and BAM - that baby didn’t need any more adjusting. It was cutting!

You can imagine all the relief and pride I felt when the Plasanator started kicking ass. Yea, I said it Kicking Ass Baby. Oops Wife just told me I need to stop, hee hee and for all you creators – ah ah ah ahhhhhh.

I hope you enjoyed riding along with me in my journey.

Take care and be safe.

The Plasmaman

Step 2: Parts List

Parts List

Step 3: Warning Warning

Step 4: Schematic

Chevy Pictorial Schematic

Step 5: Another View

Step 6: Another Schematic to Looksy At

Step 7: Board Lay Out

Now this is to demenstrate how I set it up before putting it in a case configuration.
So dont think you would leave it like this for it would be to dangerous to do so.

Step 8: Transformer I Used

Its a control transformer I got off ebay for 50 bucks.
It's 220 to 120 3kva 25 amps and works great in power isolation.

Step 9: Transformer Connected to Board Terminals.

Step 10: Power to Contactor Terminals

These are the contactor terminal conections on the transformer side and then the contactor to large bridge rectifier connections.
Also you will see Bridge rec to Capitor connections and how they are connected.
This is your Main Current set up.

Step 11: Reed Current Sensor

Step 12: Low Voltage Side

Step 13: Relay Connections by Color

Step 14: Chevy HV Transformer Connections

Step 15: Arc Tip Assembly to Head

Step 16: Head Air Coupling

here is where you will connect your air line to your head if you dont have a fitting to do so then hook to board connections.

Step 17: Air Filter/ Element and Solinoid Hook Up View

Just showing temp hook up.

Step 18: Final Power Connections

Ok now you can put all your final connections together and keep going over your schematic to double or triple check everything.

Step 19: Extra Photos of Past Cutter Projects

Here are some photos of past cutter projects for you to enjoy.
Now remember that you will need to put in a case for safty.
It can be would metal or plastic just enclose it.
My photos are in a testing stage and that is why you see them exposed.
The photos of the red cutter was a china one that burnt up on my neighbor and I ripped out the guts and replaced it with my design.
He just loves it.
The black box on side is the housing for 2 elements to draw more current.
You will also see here some other designs where I used a chevy control module as the hv arc start and my first plasma cutter on test stand using stove coils as current resistors.
Have fun and be safe ya'll. Joe

Step 20: Plasanator 3's First Cut

Goto link and watch it's first cut while listening to the mission impossible song.
Thanks for stopping by and God Bless.

2 People Made This Project!


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242 Discussions


Question 1 year ago on Step 20

Hi I am confused about hooking up a wire from the AC side of the rectifier to the second cap on the negative terminal won't that damage the cap as they work on DC current?

Thanks Barry

2 answers

Answer 4 weeks ago

No, it won't hurt it. To better understand, redraw the transformer, diodes and rectifiers as a full wave bridge circuit without the wire. It produces approx. 1.414 times the bridge AC input voltage at two times the AC input frequency, i.e. 120 Hz in USA. Note that current path is through all four diodes. Now add the wire, and retrace the current flow. Notice that current only flows through two of the four diodes. Now, it operates as two half wave rectifier circuits in series. The output voltage is less than the full wave circuit, and the output frequency is the same as the input line frequency. Before universal voltage input power supply designs, the circuit was used to allow the equipment to operate on either 120/240 volts depending on whether the wire was in the circuit or not.


Answer 1 year ago

No it won't it acts as a voltage doubler circuit.


1 year ago

My isolation transformer made of a old welder machine. It will be capable to supply 40A at 220vac. I will try to remove the heater element an include a pwm controller. For HV i designed a coupling coil to isolate the HV side of the high current side. Soon as i test i will publish here. Wish me luck!

WhatsApp Image 2018-02-18 at 22.24.02.jpeg
3 replies

Reply 1 year ago

Be nice to see it. good luck God speed

Plasanator, I have a question for you and the rest of the community. Have you figured out how to change amperage? And a way to rid the design of the wasteful resistors? Like a simple pwm circuit to control amps?

1 reply

As it stands now I just parallele 2 or 3 elements together for more current cutting power.
I am just about done with COMPLETELY NEW PLASMA CUTTER where all you do is turn selector for more power eleminating resistor elements. Stay Tuned Folks.


Question 5 weeks ago

apa pungsi dari penggunaan elemen water heater mohon dijelaskan pak karna saya kurang paham dwlam pungsinya

1 answer

Answer 5 weeks ago

Sir i don't know what you are saying, Sorry

I wanted to post some info for anyone wanting to use a flyback transformer for the HV start. A flyback transformer needs some type of driver to conduct voltages. It acts more like a choke with coupled windings than a true transformer. It needs a pulsed, generally high frequency source to conduct the high voltages. If it doesn't have a collapsing or changing field at a higher than line frequency (60hz) it will not conduct voltages very well if at all. 
​The driver can be a simple spark gap, a 555 timer circuit, simple mosfet switching circuit, pwm circuit, a florescent light ballast (even one from a compact cfl). I am unsure if a lc or rc circuit would work. You don't need very much current for the HV (mA is ok), the voltage alone is enough to start the plasma. 


3 months ago

What are the values of the components of your measurements?

1 reply

Reply 2 months ago

I have a parts list that will tell you everything you need.


6 months ago

If anyone would like to have: switch, breaker, allen bradley contactor, relay, din rail, enclosure box, psi meter (manometer), selenoid valve, hose fittings, hp hose, a allanson 120 to 6000v natural gas ignition transformer, a 200 amp welder plug like the link under that I can add the big breaker already fixed to with the enclosure box... and lot of things... for really fair price and the best industrial grade quality you would not think possible for the price i will do, just message me back please.

1 reply

Reply 2 months ago

I’d like to Ernst least some of these parts if you still have.


Question 6 months ago

i don't understand something, in one pic you show the 3kva Isolation transformer as a 220 to 120 or a 120 to a 120.

my question is, are you using 120 to get 120 or are you using 120 to get 220 or are you using 220 and stepping down to 120 for power? and what's the significance of the 3kva?

i know very little about electronics, just enough to be dangerous.

3 answers

Answer 6 months ago

220 to 120 but now I just use 220 straight from mains with 40 amp breaker, no problems here


Reply 6 months ago

does this change the wiring or component?


Reply 6 months ago

wiring still could change back to get 120 less thickness of cut