My Newb Plasma Table Attempted Build
- dvn4life1972
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It looked to be about half way across, so I doubled the scale. I have the travel limit set to 49.75in. It traveled 48.375in. I'm only guessing here, but maybe the wheels are acting as a minor reduction?
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- tommylight
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Wheels can not reduce anything in that case.dvn4life1972 wrote: It looked to be about half way across, so I doubled the scale. I have the travel limit set to 49.75in. It traveled 48.375in. I'm only guessing here, but maybe the wheels are acting as a minor reduction?
Measure, change the scale a bit, measure again, change the scale.....till you get the exact distance.
You can do that from the calibration in the machine menu in Linuxcnc, so no need to restart Linuxcnc each time you change something. Just be sure to save to file when done.
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- machinedude
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- tommylight
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So the settings should be
motor:pulley = 1:1
pitch should be 60mm or 2.3622 inch.
microstepping should be what is set on the drives.
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- machinedude
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- tommylight
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forum.linuxcnc.org/show-your-stuff/38547...lasma-build?start=20
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- dvn4life1972
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tommylight wrote: Pictures of building a reduction system using pulleys and belts, as requested.
forum.linuxcnc.org/show-your-stuff/38547...lasma-build?start=20
Holy cow! That thing is awesome man!
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- dvn4life1972
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All that said, I now have the X and Y homes/limits/scaling all set. For some unknown reason the X and Y required very slightly different scaling, although the limits for each are the same (48.50in). Maybe it's because of the dual motors on the Y axis, I don't know. But it's working and repeating at slow speeds now. I'm now working on dialing in the Z axis (it's a mess at the moment). Once that's completed, I'm going to bump the speed up and see what my threshold is for accuracy/repeatability. I think this is a reasonable plan.
I still have to make a mount on the table leg to secure the electronics enclosure to, wiring in the voltage divider/arc ok/torch start from the plasma to the enclosure, then I can test with all of that connected and get into plasmac. I guess a fortunate coincidence of this whole crazy covid-19 thing is that I have time on my hands to really get after it. I can already say that I would be MUCH farther behind where I am now without help from this forum and it's members, I'm very grateful.
Pat
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- tommylight
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LOL, yes they are, made 4 of those in 2 days, 2 are 15cm wide and 2 are 20cm wide, the narrow ones have 1.8A steppers while the wide ones have 2.4A motors. Just working on installing the wide ones on the bigger machine.dvn4life1972 wrote:
tommylight wrote: Pictures of building a reduction system using pulleys and belts, as requested.
forum.linuxcnc.org/show-your-stuff/38547...lasma-build?start=20
Holy cow! That thing is awesome man!
BTW, check by the end of that topic to see what those reductions are doing!

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- dvn4life1972
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Pat
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