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4x8 CNC Frame Build Success???

Discussion in 'CNC Mills/Routers' started by MrLRichards, Nov 26, 2017.

  1. MrLRichards

    Builder

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    Hello,
    I am wanting to build a CNC machine that would have an X axis between 8-9 feet long and Y axis about 5 feet all to accommodate the 4x8 plywood. Has anyone had any success building one of this length or similar?
     
  2. Kevon Ritter

    Kevon Ritter Veteran
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    Considering that 4x8 is the largest standard size (5x10 and 5x12 goes into specialty territory), you would not need a wider cut than 4ft. Therefore, your X would be about 5ft and your Y would be 8-9ft.

    There are a few obstacles you would encounter.

    Rigidity:
    • After a certain point, a 2020 extrusion is just not enough. It starts to become "stretched" at 1000mm. 1500mm requires multiple pieces, and even then is a hassle.

    Motion:
    • Now your gantry is heavy. You need many more wheels to support the weight. But do you really want to stick with wheels? Why not linear rail?
    • The more significant issue is your drivetrain. Forget belts. You may be able to get away with a 1/2" lead screw on a 1500mm length, but you'll need a bit more to span 9ft. This would go for both ball and lead screws. An alternative would be rack and pinion.
     
  3. Rick 2.0

    Rick 2.0 OpenBuilds Team
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  4. mr68gts

    mr68gts New
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    Biggest issue would be alignment of it all with something that large if you want any kind of accuracy.
     

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