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Gargantua

Discussion in 'CNC Mills/Routers' started by Spiffcow, Jul 18, 2017.

  1. Spiffcow

    Spiffcow Veteran
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    Spiffcow published a new build:

    Read more about this build...
     
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  2. Gary Caruso

    Gary Caruso Veteran
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    Cool build!
     
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  3. Spiffcow

    Spiffcow Veteran
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    Thanks! Hoping to have it done in the next couple weeks, but who knows how long it'll really take :)
     
  4. Steve Mc

    Steve Mc Well-Known
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    Great to see someone taking on a full sheet size. Will be watching with much interest.
     
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  5. Bad Sequel

    Bad Sequel Veteran
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    Looking forward to seeing this completed!
     
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  6. Spiffcow

    Spiffcow Veteran
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    I'm expecting it will hold pretty well -- it's all PETG, 50% infill with 3 perimeters and a concerted effort to have the stress points align horizontally and transfer most of their force to the extrusions. You can hit the side of this thing with a mallet and it won't move -- I tried it :) I'm more worried that the holes I tapped in the conduit for the supports won't hold -- it's only 16 gauge steel, so that's not even 2 full threads per support, and right now I only have 5 supports. Of course I can always add more, but that'll mean partially dismantling the machine to do so.

    I'll definitely keep it up to date and let you know how it goes -- even if it doesn't go well. This is actually building on what I learned with some previous builds, and all the weaknesses I encountered before are mitigated in this design.. Hopefully there aren't too many new weaknesses!
     
  7. Spiffcow

    Spiffcow Veteran
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    Build is mostly complete and is pretty rigid, but my Chinese spindle is struggling to keep up.. I'm going to put a Makita compact router on it this weekend if all goes well. It's very rigid on the long axis and Z axis, but the plastic shows its limitations on the short axis.. It flexes in the YZ direction. Currently it's still pretty rigid, but it does flex if I put a lot a pressure on it. I plan to mitigate this by fixing an aluminum plate to the back once I have the capability to cut aluminum.

    I have posted the parts at Plastic Monstrosity -- The 3D Printed CNC for 4x8' Plywood by spiffcow in case anyone else wants to print and build one.
     
  8. Spiffcow

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    First cut with a Makita router...

     
  9. MKD

    MKD Well-Known
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    Loving this!
    are you planning on posting a full-on parts list etc once you've sorted it all out? love to hear.
    Also what thickness ply are you cutting at the moment? max thickness you've tried etc?
    Some of the downloadable opendesk cnc plans call for 24mm py which I'd love to cut - but wondering how well you think your design would do at 24mm?
     
  10. Spiffcow

    Spiffcow Veteran
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    Absolutely, I just haven't had time.. I have (accidentally) cut more than 24mm deep and it handled the cut just fine. I'm making this specifically for making 2.5D furniture, and the first few "real" things are going to be OpenDesk chairs :) The only issue I'm still working out is how to best handle surface mapping -- even if your cutting surface is flat, a 4x8 sheet of plywood won't be. I've got a little endstop mount for the Z axis printed, but haven't tested it out yet.. I'm thinking I'll just do a firmware bed height mapping before the cut. I'm not going to be able to use it for the next 2-3 weeks though, so I can't promise a date on that.

    If you're looking to start building it, off the top of my head you'll need:

    - The plastic parts in the Thingiverse entry I mentioned in an earlier comment
    - 3x high torque NEMA 23 motors
    - 1x NEMA 17 motor (70 oz. in. or higher)
    - 14x 625 bearings (I'd get more just in case)
    - 14x 608 bearings (again, get more just in case)
    - ~200x 12mm M5 screws
    - ~25x 70mm M5 screws
    - ~30x 30mm M5 screws
    - ~30 25mm M5 screws
    - 1x anti backlash nut block
    - 1x 250mm T8 leadscrew
    - 1x 250mm C beam extrusion
    - 1x 1500mm C beam extrusion
    - 2x 2" 10ft conduit pieces from Home Depot (they're actually a little more than 2", but listed as 2")
    - ~30x 5/8" bolts
    - 10 meters of 10mm wide steel-reinforced GT2 belts
    - A bunch of lumber and Simpson ties for the table
    - A spindle or router (I use a Makita compact and it works great.. I still need to add the STL for it. I also have one generated for the DWP611 that I need to add)
     
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  11. MKD

    MKD Well-Known
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    thats great, thanks for that. I'm in new zealand (metric...) which is great youre using mostly metric fasteners etc.
    With the conduit though what overall outside diameter are you using? its easy enough to find thicker walled pipe which i assume would add more rigidity than the thin walled tube. id just have to make sure the 3d printed parts and tube match up is all, without changing stl files etc.
    also, do you know the router model? i have a few compact makitas available here
    Appreciate the replies by the way. cheers!
     
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  12. Spiffcow

    Spiffcow Veteran
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    Oh, I meant to write 5/16" for the bolts btw.. 8mm should work as a substitute for those.

    Here's the conduit I used.. If you can't find anything within a couple mm of it let me know and I can generate the parts based on whatever you can find nearby

    2 in. EMT Conduit-101592 - The Home Depot
     
  13. Spiffcow

    Spiffcow Veteran
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    Oh and the router is RT0701C. If you need something different just let me know the diameter
     
  14. MKD

    MKD Well-Known
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    Nice, i can get an RT0700C which is the same i think the 01 is the US version.
    pipe-wise i can get 40NB or 50NB easily. 40NB is 48.3mm OD and 50NB is 60.3mm OD.
    Various wall thicknesses ranging from 2.3mm (super light) to 4.5mm (heavy).
    I'm thinking light or medium which would be 2.9 or 3.2mm wall

    your conduit is 2.197in. or 55.8mm OD and 0.065in. or 1.65mm wall

    Aliexpress is probably my best best for the steppers, did you get any specific degree or amp rating?

    Side note too - have you tried running it in a vertical orientation? or say, leaning on your shop wall VS taking up shop floor space - would it run?
     
  15. Spiffcow

    Spiffcow Veteran
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    Cool, I'll try to get that generated tomorrow. As for mounting sideways: I had originally intended to mount it at a 45 degree angle, but I was eager to get it done and didn't want to complicate things. I think it would do well mounted at an angle, but if you do you will want to get thick wall conduit.
     
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  16. ChadRat6458

    ChadRat6458 Journeyman
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    What spindle did you use? I am looking at spindles for my next build. Considering a 800w water cooled.
     
  17. Spiffcow

    Spiffcow Veteran
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    I have a 500W generic Chinese spindle.. It does alright with 1/8" bits, but it's really just too under-powered for wood, and it doesn't have an automatic speed control. I plan to reuse it in a smaller build for cutting soft metals, which it might be better for since it tops out at 12000 RPM.
     
  18. MKD

    MKD Well-Known
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    are the stl files modelled in mm or inches? just getting quotes.
     
  19. Spiffcow

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    Should be mm.. It's all done in OpenSCAD.

    This project requires a lot of 3D printed material.. Around 2kg or so, and I recommend using PETG.
     
  20. Spiffcow

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