Rods "Spaceship" Scratch built Plasma Cutter build

Ahh, I think I get it now, I see the external_offsets sims in the linuxcnc-dev folders now so I guess its just a matter of running make again! Lets see what happens after it finishes building

tommylight wrote: Rod, your build is looking niceeeeeeeee!
I offloaded a plasma frame build to a friend, metal worker, still waiting for it and last i saw it he had to cut it and weld it again due to a lot of mistakes.
Regards,
Tom

Thanks Tommy. I am a bit worried that might happen to me!

Anyway, I was able to install Dewey's external offsets code, but I don't really understand it yet.

You shouldn't need to pull again.

Joco wrote: You shouldn't need to pull again.

Thanks James, I think I had a network timeout the first time round when I first tried. Now I just have to work out what it all means!

Rod

I have a spreadsheet which calculates step-per-mm (or steps-per_in), if you give me the relative info I can calc it for you. If you want, I need driver micro steps, motor revs per step (usually 200), rack module number, gear ratio if any (1:1, 2:1 etc) and pinion teeth.

Cheers
Bruce

racedirector wrote: Rod

I have a spreadsheet which calculates step-per-mm (or steps-per_in), if you give me the relative info I can calc it for you. If you want, I need driver micro steps, motor revs per step (usually 200), rack module number, gear ratio if any (1:1, 2:1 etc) and pinion teeth.

Cheers
Bruce

Bruce thanks, It would be great if you could check my maths.
23 tooth pinion, 1.25 module (supposedly)
5:1 gear reduction (90:18)
4000 microsteps (becasue Mesa lets me do it)
200 ppr (1.8deg) steppers
So I made that to be 221.432988602 pulses per revolution. I'd have to check, but I think I had to drop that to about 210 to get it calibrated.