My Newb Plasma Table Attempted Build

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30 May 2020 14:08 #169422 by dvn4life1972

rodw wrote:

dvn4life1972 wrote: It was a 10-pack. Was yours a 10-pack? Eh?


You win! my poor pulley is outnumbered 10:1


Well done :D

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01 Jun 2020 21:52 #169725 by dvn4life1972
Tommy...

I finally received the correct 16T 2GT pulleys and installed them with the new belt, recalibrated and all that. So before I had the 20T 3GT belt/pulleys and was set at 1/8 microstepping. Now I have the machine set to 1/4 microstepping. Is that about where you would have it for this setup?

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01 Jun 2020 22:02 #169726 by tommylight
If it works properly and does not make much noise while moving, leave it there.
If it vibrates to much on slow moves, you can set it to 8 and change the scale accordingly.
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01 Jun 2020 22:48 #169732 by dvn4life1972
Thanks Tommy. I tried a test cut of a part where before the changeover I thought it was skipping teeth. Looks like the identical problems in the identical places, skipping steps. The new belts/pulleys are not jumping teeth, this I now know for certain. Starting to think I should change the table over to rack and pinion with reduction.

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01 Jun 2020 23:07 #169734 by dvn4life1972
I just checked the CAD file and it looks good. These are parts I designed several years ago in Solidworks, and I converted them from that software to dxf files a few days ago. I've had issues in the past with Solidworks saving as dxf, so when I just rechecked in Fusion 360 all was good. So that's not it. Also looks correct in Sheetcam.

So now I'm wondering if it's the plasma. I don't have a dedicated ground for the table (grounding rod), and maybe that's triggering it. Weird thing in my opinion is that it doesn't do this with all parts, only some of them. I'll drill the slab and add a dedicated grounding rod anyway, can't hurt anything.

Any idea why some parts are doing this and some parts are not?

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01 Jun 2020 23:23 #169736 by tommylight
Might be mechanical.

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02 Jun 2020 00:02 #169741 by dvn4life1972

tommylight wrote: Might be mechanical.


Maybe so. Left side of part (Y2) is good, right side (Y1) isn't.
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02 Jun 2020 00:15 #169742 by tommylight
Some parts are cut very clean and nice, so issue is not with belts, that is for sure something bent or miss aligned causing the whole head assembly to move.
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02 Jun 2020 00:18 #169743 by dvn4life1972
After that little part I decided to try a square, thinking maybe the gantry could be out of square. I had it off of the table for the belt and pulley change and it's possible I could've knocked one of the proximity sensors (used for homing and limits on my table).

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02 Jun 2020 00:30 #169746 by dvn4life1972
That square cutout prompted me to physically check the gantry for squareness at it's home position on the Y axis. Y1 side is 1.125" from the end of the extrusion (end of machine), and Y2 is .850". I think I've found my problem.

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