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Repurposed Steel Table 4 x 8 Build

Discussion in 'CNC Mills/Routers' started by KaosCNC, Apr 17, 2018 at 3:28 PM.

  1. KaosCNC

    KaosCNC Well-Known
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  2. Techvette

    Techvette Well-Known
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    For that length, you're probably looking at a belt or chain drive. I have chain on the long axis of my router. It works pretty well, but you don't get the accuracy of a screw without serious microstepping and a really great chain. BuildYourCNC.com has parts for chain systems. They're not cheap. I haven't seen a functioning system with a lead screw or ball screw that long.

    Another option is rack & pinion. Again, not cheap, but it works well.

    What materials are you planning to cut?

    Post updates! I'd like to see how it turns out.
     
  3. KaosCNC

    KaosCNC Well-Known
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    I am looking to mainly cut plywood and 1x material for signs.. maybe some ABS plastic - acrylic and color core. I was thinking a belt drive -
     
  4. KaosCNC

    KaosCNC Well-Known
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    Was wondering where I can find DXF files for plates that would go onto a C beam for holding my Z axis. I found some DXF files for a 40x60 but not 40x80.
     
  5. wastelandfab

    wastelandfab Well-Known
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    Files - SMW3D R7

    Those are some of the best plates for running with c-beam. You will want to recess the holes about 2mm or 2.5mm so the screw heads are countersunk enough, that is if you are using openbuilds screws.\

    Join google plus groups. I would suggest openbuilds group, R7 cnc community, and ox cnc. Lots of builds and ideas on there
     
    Techvette likes this.
  6. wastelandfab

    wastelandfab Well-Known
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    I'm working on a 5x8 plasma machine. It takes a lot of side support, depending on the rails you are using for the sides. If they are mounted to the table, no problem. GT3 or better quality belts, doubled up, with one glued down inside the track would get you started, for low cost. You can buy 30 feet of gt3 belt on amazon or ebay for a few bucks. Using a chain would be ok, but expensive. Rack and pinion, even better-thats what i really wanted to do with this machine, and still may, but the parts from cncrouterparts . com are expensive (somewhat). McMaster Carr also sells rack, and pinion gears, but you would need to come up with your own solution to gearing down the stepper motors for optimal power.
     
  7. Techvette

    Techvette Well-Known
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    That is a @#$!!-ton of wheels. It hadn't occurred to me before to put them on the inside *and* outside of the c-beam. At that cost, though, it might make more sense to switch to fully-supported linear rail. :/

    I need to figure out a way to machine the wheels. (Oohh - finally a reason to buy a lathe!)
     
  8. wastelandfab

    wastelandfab Well-Known
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    The wheels are worth it. I also added a 20x80 extrusion to the front of my router and bolted them together. With only running a plasma, your not going to have as much force, so I'm running similar plates to that, except I left out half the wheels (only running 4 inside the cbeam, and 8 total on the top and bottom of gantry. So it's pretty reasonable. I think you can get the wheel kits for about $5 a piece. Lol not worth buying lathe for. I don't know how much a fully supported linear rail costs (or if they are available in 4 foot pieces.)
     
  9. KaosCNC

    KaosCNC Well-Known
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    Joined those groups..... still looking for a plate to fit onto the c-beam. I tried modifying the plate dxf for the 60mm but I am still off the ecenntric nuts ride just below the c beam and depending on how they are positioned they scrape the bottom of the c-beam.
     
  10. wastelandfab

    wastelandfab Well-Known
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    I cut those exact plates and they were dead on.
     
  11. KaosCNC

    KaosCNC Well-Known
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    If I am not mistaken the plates are not for a 40x80mm c-beam - I believe they are for a 20x60 or 40x60 rail.
     
  12. wastelandfab

    wastelandfab Well-Known
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    Nope. For 40 x 80. Those are the files smw3d.com used (maybe still use bit updated the missing hole in one part) for their r7. I have actually used those dxfs twice for plates
     
  13. KaosCNC

    KaosCNC Well-Known
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    Ah... now that I know to look for R7 I think I have found the correct files... thanks - sorry about that ... new and all I am not sure of the correct questions to ask.
     
  14. wastelandfab

    wastelandfab Well-Known
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    No worries friend. Keep us posted on the machine build! Plasma cutters are the best
     
  15. KaosCNC

    KaosCNC Well-Known
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    If I wanted to have someone cut plates for me.. any idea how much they'd cost? They would need to fit a c-beam.
     
  16. wastelandfab

    wastelandfab Well-Known
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    Are you looking for custom plates?
     
  17. KaosCNC

    KaosCNC Well-Known
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    that is what I am thinking.
     
  18. KaosCNC

    KaosCNC Well-Known
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    So this is where I stand... I prototyped some side plates out of plywood and then enlarged the Ox plates to have more holes at the bottom so its tall enough to go onto a c-beam. I am not sure if I should continue down this path or go all openbuilds. This concept would be a mix of printed parts, ABS plastic and the OpenBuilds linear rail. The Z axis has a printed top part with a Nema 17 and the bottom plate is printed. The middle plate is from Openbuilds. However, I am not sure the best way to mount it. I do have a printed part that goes onto the c-beam but not sure how rugged it will be. I have a makita 701c routher that I want to run so I also need to figure out how i'll mount that to the z axis.
     

    Attached Files:

  19. wastelandfab

    wastelandfab Well-Known
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    We think alike. I cut these out with an r7. Using them for my build, still working on my design if I should make new plates for the sides, or just use ox plates I have laying around. 20180330_182854.jpg
     

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