Yet another corner/legs design, is it any good?

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This topic contains 9 replies, has 7 voices, and was last updated by  Pancho Vitya 1 week, 1 day ago.

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  • #106309

    Pancho Vitya
    Participant

    Hi,

    Just building the MPCNC and looking on some advice on the corners/legs.

    Not sure if needed, but I was thinking on adding some rigidity to the structure… and came up with this basic design.

    new-corners

    The idea is to use 6mm all threaded rods to ‘sandwich’ all the parts together and secure them tightly to the table. I’d still probably go for the original spacers between the conduits. Perhaps a top plate might be needed, ideally a metal one.

    I’ll be happy to hear your thoughts on this, is it worth the effort and filament, any potential drawbacks.

    Cheers,
    V.

    Attachments:
    #106345

    Ryan
    Keymaster

    I don’t feel it is needed, but it can’t hurt. The biggest downside is getting your build square with 16 holes of that size.

    1 user thanked author for this post.
    #106348

    Jamie
    Participant

    If you have a fixed leg height and a single piece from top to bottom then you might benefit from a gusset.  It would be very efficient in that you gain a lot of stiffness for a small amount of material.  A gusset is not so easy for a variable length leg where the top and bottom are separate.

    #106471

    Bill
    Participant

    I don’t feel it is needed, but it can’t hurt. The biggest downside is getting your build square with 16 holes of that size.

    All you need to do is build a Low Rider to drill the holes for you. Just like magic you’ll have everything lined up for a perfect rectangle. 🙂

    1 user thanked author for this post.
    #106496

    Jethro
    Participant

    I saw one corner lifting a bit one mine, but there was quite a bit force involved. A bit of tightening might solve that issue anyway.

    If I would tighten anything I would go straight for the tubes. Using a clamp and a rod or something similar.

    Just wonder where the belts are attached?

     

    #106541

    c0
    Participant

    “Totem corner post mod”

    https://coeleveld.com/mpcnc-part-4/

    #106602

    Pancho Vitya
    Participant

    Thanks all for the comments. Most of the other stuff is printed and assembled, so I might go with this design for the legs.

    I don’t feel it is needed, but it can’t hurt. The biggest downside is getting your build square with 16 holes of that size.

    You can’t imagine how helpfull i find the words ‘of that size’

     

    “Totem corner post mod”

    https://coeleveld.com/mpcnc-part-4/

    I really like the Totem corners, that’s what leaned me into this new design, actually. But the main difference, and also where the advantages might be, is the lower part (green one). You can gain a lot of rigidity (at the expense of some filament), simply by means of leverage – that’s what I think, at least. We’ll see.

    Just wonder where the belts are attached?

    Belts and endstops will go on separate plates – you only see some of the mounting holes here (I’m lazy, I know). I like modularity, you can make minor updates without assembling and squaring everything from scratch. But we’ll see how it goes – iterative design, they say.. drives me nuts sometimes 🙂

    #106603

    Pancho Vitya
    Participant

    I don’t feel it is needed, but it can’t hurt. The biggest downside is getting your build square with 16 holes of that size.

    All you need to do is build a Low Rider to drill the holes for you. Just like magic you’ll have everything lined up for a perfect rectangle. 🙂

    Yep, you just need to build a MPCNC to cut good Y plates to build the Low Rider… oh, wait 😀

    We’ll all go to Low Rider some day, just need a bigger basement 🙂

    Cheers

    #106615

    ronbot
    Participant

    Grow the pieces a little so the spacing of the holes is 50.8 mm(2inch) instead of the 40ish mm they are now .

    You now can use peg board to align the machine base (or even as part of the base).

    With this spacing, before putting the middle z gantry onto the x/y rails, a sheet of peg board temporarily slipped over the threaded rod on top could be use to square it up before the x/y pipes are snugged up to ensure square.

    Just an idea.

    #109486

    Pancho Vitya
    Participant

    leg

    Just an update, so far it’s looking good.

    I wanted to go for 8mm all threads, but legs were way too beefy. Also, with the 6mm rods I can keep the original corner dimensions.

    Quite a good idea to use the peg board for squaring, I might use that. Assembly coming soon.

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