I figured that I’d start this discussion so that we can all hammer out some technical points when/ if/ before one of us actually gets a plasma torch attached to an MPCNC.
To start, there really isn’t a standard feedrate- amperage setting table that we can go off of because it’s highly dependent on your make and model of plasma cutter. There was a discussion about this very issue a while back on an off-road 4x4 forum that I frequent and for our purposes, it’ll get us started and give us some talking points. Plasma settings discussion
First issue to consider is the cutting surface. Wood is definitely out of the question. I’m still toying around with ideas for a cutting table, but the common grate/ slats plasma table should work perfectly. Of course this doesn’t have to involve cutting and welding metal, it can be assembled from gas pipe or even more conduit. Of course mounting with PLA feet is out of the question, but since we’re welding anyway, I’m assuming that I’ll just integrate the gantry rails into the table.
Next, how are we going to keep the spatter and general heat from turning our MPCNCs into a pile of PLA goo? I’m open to ideas. A metal heat shield or downdraft table would be suitable.
Insulating the sensitive electronics from the high current plasma arc. I’m thinking that my Ramps and Mega aren’t going to like 30+ amps coming from any direction. I don’t know how the table at here at work does it, but I will try and find out when I have time and the machine isn’t running.
Torches. I ordered a bottom (I mean as cheap as they get) of the line CNC style torch for my cheapo import CT 312 multi process machine. Link here I’m not willing to devote one of my more expensive units to this project because I need them daily.
Thoughts? Ideas? Harsh criticisms?