A couple of years ago, I read about Fiero Addiction's Low-cost build and was inspired to attempt one myself. Mine is somewhat different but you might recognized the belt drive and some general similarities. The most common part is the cost, my build budget was $1500 (plus plasma & compressor) and I should make it under that - albeit barely. I wanted a machine small enough I could get it through a 36" door and load it into a pickup or wheel it out onto my patio. I hoped for it to be clean-enough to run it in my indoor basement shop (at least for quick little jobs). I wanted simple and it had to be as much DIY as possible.
I made a variety of mistakes but overall, I am very happy with the progress. It is still several hours from finished but it is together enough to do some early tests and I thought you might enjoy seeing a different version.
Basically the machine has 4 NEMA 23 motors, an old Dell XP PC, mach 3 software and Keling motors, drivers & breakout board. It uses initial height sensing (no THC). I use Turbo Cad v14 (cheap) to make the drawings, LazyCam (free) to build the g code and then I manually do the post processing. The plasma is a Hypertherm 600 (with fine cut consumables) and just a basic 5 hp compressor. The table measures approx 30" by 48". For now, I just empty the water out into a tub and keep the pan empty when not in use. I use a garden hose to refill. Its only about 15 gallons, small enough that I can drag the tub out the back door and dump it.
The electronics "drawer" is a modfied key box that I bought at HF - I was pretty happy with this until Fiero upped the ante with much better set-up.
Here you can see my idea for the gantry. I got the stainless mount (used), cableing, cable track from fleabay. The cogs and belts from McMaster. The Al was a piece of scrap.
This is where I was about 3 weeks ago. The lower PC box still has to be enclosed, but you can see the basic idea I am after.
Here is how it sits today - still many issues to complete.
And a few cuts- note the changed torch mount.
The first few cuts were pretty poor, but like everything, you just have to keep testing and work through the settings and problems. Here is a small piece taken directly off of the table.
And last and best, here is comparison cut. The foreground wrench is cut on my budget machine (some general clean-up but the the inside radius is untouched) The wrench in the background was cut on a commercial waterjet that costs as much as a nice home.
Special thanks to Fiero and all of you guys that do this with out spending a lot of money....Bruce