Controller build for Plasma

I'm taking the basic idea of the cncdrive AXBB-E controller I designed and am building out a new controller for LinuxCNC. I will use this thread to document the process.

Pictures of the existing controller.



New controller:

The components I am using:

Mean Well SE-600-48 - 48V @ 600W power supply for stepper drivers
Mean Well RS-25-5 - 5V @ 25W power supply
Mean Well HDR-15 - 24V power supply for THCAD Ohmic
Mean Well LRS-150-24 24V @ 156W

DM556T Digital Stepper Driver 1.8~5.6A 20-50VDC

Mesa 7i96
Mesa THCAD-5 Ohmic
Mesa THCAD-5 THC

Computer:

Lenovo M93P, 12GB ram core I5 (dimensions 7" x 7" x 1.5")

I am debating switching to an Odroid H2+

I plan to mount the computer to the inside of the door.

Here is how I planned to layout the power supplies and components for the new controller.



I started thinking about how this controller will be extended to the new machine I am building and I forgot to add an additional driver for the A on the Y axis. I am able to modify the layout by putting the 24V on the inside of the door of the enclosure.





I've been making panels out of 16 gauge mild steel. I will put a large panel on the front of the door as well. You can see I have cut out the holes for the panels in the enclosure already. Once complete I will spray it with the thin black bedliner spray paint I used on the last controller. I might leave the inside of it white as it will make it easier to see inside once it is put into service.

Here is my existing machine.

Not looking good?

Running under Linux Mint 20 with rt kernel.

Maybe there are some things I can tweak in the bios.

Thank you. It has worked well over the last month.

I did a lot more tweaking, installed Linux mint 19.3, and did some more noise disabling of things to help. Hopefully my 7i96 gets here by next week so I can start bench testing.

I also like your breakaway - more elegant than having to fight gravity, balance the breakaway forces in the different directions, and to catch the torch

@RodW I know we had talked about the 25K 5Watt resistor needed for the ohmic thcad-5 setup. Does it replace the 300K resistor below?

Mud wrote:

I also like your breakaway - more elegant than having to fight gravity, balance the breakaway forces in the different directions, and to catch the torch

Thanks. That is exactly what I was trying to accomplish.

xnaron wrote:

@RodW I know we had talked about the 25K 5Watt resistor needed for the ohmic thcad-5 setup. Does it replace the 300K resistor below?

No Its in addition to it on the high voltage side as a pull down or pullup. I'll check it out when I get a chance and advise.