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Design for large CNC

Discussion in 'CNC Mills/Routers' started by Benjamin Vg, May 3, 2019.

  1. Benjamin Vg

    Benjamin Vg Journeyman
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    Hello,

    I would like to build a CNC able to work on a full MDF sheet: 2440 x 1220mm.
    By digging into this site I think that both OX and WorkBee design could be adapted to this dimensions but the main difficulty will be to find the linear rails in 3m lenght especially the C-BEAM one.
    1. First all, is it correct that those two design are two good candidates for scaling or am I wrong? Are they other design that could be more adapted?
    2. Are there some advatages from one design comparing to the other?
    3. Are they some other attention points or modification I need to do to be able to scale those machines? I am a complete CNC newbie.
    4. Does someone know where I could find a 3m lenght rails not too expensive? I have found the V-SLOT one in France I can probably find it cheaper somewhere in europe.
    Regards,

    Benjamin V.
     
    #1 Benjamin Vg, May 3, 2019
    Last edited: May 3, 2019
  2. Alex Chambers

    Alex Chambers Master, Openbuilds Team
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    Neither the Ox or the Workbee are suitable starting points - the aluminium extrusions used for the framework are just not stiff enough. The leadscrews used as standard on these machines are also not suitable for lengths over 1000 mm - you would need much larger diameter screws for a machine the size you are proposing. If you look through the builds section on the forum you will find examples of projects like yours which will help you come up with design ideas. Basically you will need to design and build your own machine (lots of ideas on here to get you started) - there are no kits that would make a good starting point. Once you have an idea of how you want to go ahead start a build report and you'll get lots of helpful suggestions from experienced forum members.
    Welcome to the forum @Benjamin Vg and good luck with the project.
    Alex. :):):thumbsup:
     
  3. Benjamin Vg

    Benjamin Vg Journeyman
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    Ok thank you I will try to find another suitable starting point for my project and come back with more ideas then!
     
  4. Benjamin Vg

    Benjamin Vg Journeyman
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    I really wonder why they are no more builds of that size are they a particular reason for it. I guess that I am not the only woodworker who have those needs not is it just useless?
     
  5. Alex Chambers

    Alex Chambers Master, Openbuilds Team
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    Not useless - there are several examples on here of large format machines. The Openbuilds designs are for hobby machines and the kits are designed with newcomers to the hobby in mind.
    Alex. :):)
     
    Rick 2.0 likes this.
  6. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    It really comes down to what you want to use the system for. If you're wanting a more substantial commercial grade system you'll want to go with a system from someone like cncrouterparts. If you are truly just wanting hobby grade, it is possible using OpenBuilds extrusion but you'll want to double up the X-axis rail and you'll want much more substantial belts than the ones OpenBuilds offers. As far as 3m extrusions, that's really not necessary. If you carefully butt two 1500mm sticks you should be able to get a seamless transition. The other option is to build a 1500mmx1500mm system and then tile the output, doing half the sheet at a time.
     
  7. Benjamin Vg

    Benjamin Vg Journeyman
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    Yes but I confess that when I see this work: https://photos.google.com/share/AF1...?key=bU9ERkFFemNReFp5UDhUR1pjeVI0cEZyZFMtYlNB I really not sure to have the ability and the knowledge to finish a huge project like this.

    Let's say that I start with a smaller machine in kit to get a bit more familiar with CNC machine, how difficult is it to move my piece multiple times and to split my 3d modelisation to be able to complete the whole work?
    The purpose is mainly to speedup and improve the quality/precision of the placement of all the accessories (hinge, ...) on those pieces of furniture.
     
  8. Benjamin Vg

    Benjamin Vg Journeyman
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    I have write my response at the same times at your Rick 2.0 but that is the idea. It is easilly feasible or not?
     
  9. Alex Chambers

    Alex Chambers Master, Openbuilds Team
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  10. Benjamin Vg

    Benjamin Vg Journeyman
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    I saw this one but I still need to add 1m on the x axes will it be ridgid enough?
     
  11. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    It’s fairly simple. Do a search for “tiling” on the forum and it will lead you to a number of discussions on the subject.
     
    Alex Chambers likes this.
  12. Giarc

    Giarc Master
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    Cncnutz on YouTube has a video explaining it as well.
     

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