Rods "Spaceship" Scratch built Plasma Cutter build

Hi Rod,

Thanks for the video. I have watched it for multiple times to see the details.

The visualistation of the torch height control is very nice. Probing goes a little slow. Speeding up the probe process is a to do item.

For info : in the EO branche the up and down speed is more violent with a sort of motor flow back control, like a servo that want to be back at position when it goes to far during violent probe speed. The parameter for this is ini.speed i think out of my head.

For your TD consumables set up, i have little suggeston Rod.

I prefer you to use a non shielded consumable solution. This option will provide you less slack polution at the end of torch when you are cutting a lot of pieces over time. At the moment you don't see solution when you are cutting a few pieces.

Deflector : 9-8243 is a non shielded option that can be used.

Thank you for deleting the Pon Catterpillar post. It's now order. They have ordered a GR_CNC with 200 Amps Thermal Dynamics driven by the most powerfull Linuxcnc. :woohoo:
Defeated Swiftcut and Microstep with linux.

My next mission in Belgium is to defeat a Italian Soitaab plc cnc plasma machine with windows embedded pre installed....
The machine works on a windows embedded plc with interfacing file's with usb or network only. :lol: Hmm.

I hadn't actually considered the speed of the servo thread as a limiting factor but that's a great point. I was just thinking about the reaction speed of the circuit itself.
After seeing that people are successfully using a much simpler method of ohmic sensing, I may drop the extra circuitry. After all, why make this any more difficult than it has to be? Fortunately, I'm still in the planning stages and haven't sent off any boards to be made yet.

Steven

@Steven,

I hadn't actually considered the speed of the servo thread as a limiting factor but that's a great point. I was just thinking about the reaction speed of the circuit itself.

For your board use "addf yourboard.read-all base-thread" and "addf yourboard.write-all base-thread".
For the components use in postgui : loadrt CustomTHC ...... addf CustomTHC servo-thread

You will see the most important is to add your custom board to the base-thread !

Think about the manhatten style. Use plug and play manhatten style connector's. Try to use a FPGA. Try to investegate if
you can switch from eternet to etercat protocol with the same FPGA. If so, you are good !!

I’m planning on using a Mesa 7176e. I don’t think it would be worth my time/effort/aggravation to build that board for what it costs. I am just thinking of building a board with some SSRs - just something fun to do without too much stress.

Hi Steven,



The above board is a board with a complicated manhatten style setup. They will change it in next generation, believe me !

SSR = Solid state relais, just for info.

Grotius wrote: Hi Rod,

Thank you for deleting the Pon Catterpillar post. It's now order. They have ordered a GR_CNC with 200 Amps Thermal Dynamics driven by the most powerfull Linuxcnc. :woohoo:
Defeated Swiftcut and Microstep with linux.

Grotius, That wasn't me. But its great to have such a prestigious client. You will be driving that Lamborgini in no time!

Thanks for the ideas, yes I had the probing slow just becasue I had been playing with a few settings. I had been that slow normally. Also, I've never tuned plasmac and its a bit high when I measured it. I also noticed in the halscope plot i did the other day that the voltage was also tracking above the set point so I'm open to suggestions on how to tune plasmac.

John, I'll revisit my estop circuit and the breakaway circuit. I may have actually done it as that was just a backup config stored on Google Drive I posted. And yes, I will check out the isolated power supply. Thanks for the methodology.

Docwelch. If you search the forum for "my 7i76e connection sheet" you will find an incredibly useful document that was done by Norbert. I think Grotius is comparing the 7i76e with ethercat hardware. For a manufacturer, I think he has to go with that technology as that what commercial customers are expecting to see. I'd love to have a play with an ethercat drive but really the 7i76e and THCAD board are a very powerful combination.