Machine base (aka table)

This topic contains 16 replies, has 8 voices, and was last updated by Profile photo of David David 4 months, 2 weeks ago.

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  • #6773
    Profile photo of Ulli
    Ulli
    Participant

    Hi all,
    what is the most practical yet technically optimal suggestion for the base of the machine, the table or structure that the MPCNC will rest on? MDF, plywood, a timber frame, aluminium extruded profile frame, … ?

    Of course, it depends, as always, on the demands and goals. This ranges, in my case, from 2D-milling of MDF, PVC, various woods and alumimium, 3D from polyurethane foam to wood, and moreover a somewhat open construction to also make mortises and tenons. 4D milling not excluded for the future.

    I’ve seen many examples of your working machines, what would you reommend as an optimal solution, if there is any? Also keeping in mind that the leveling should be easy, and that a sacrificial board should be easily placed and replaced. –

    Side-requests: The machine should be mobile, yet have a solid standing, maybe even stowable in an upright position. Oh yes, I opted for a 20″ by 30″ size.
    Sorry for my non-native English terminology!

    Thanks and cheers!

    Ulli

    #6799
    Profile photo of vicious1
    vicious1
    Keymaster

    This is what I keep using, https://www.vicious1.com/table/, but it is far form “ideal”. I Think I will end up welding together as a removable leg type base for this. I do like the 2×4 wood top and once it is built (to keep it square I build the top as one piece), I cut it so I can replace the center section easily.

    It would be nice to have wheels, or removable legs. There are some smaller gorrila racks at my local hardware store for $40 that would make a great base for these. Or if you want to spend a little extra there are the flat top rolling toolboxes with 1-2 drawers and a tool storage area.

    I am always looking for a better solution, but 2×4’s are so cheap and easy to work with it is hard to beat.

    #6808
    Profile photo of Ulli
    Ulli
    Participant

    Thanks, of course I had seen that before. My carpenter’s skills still have some headroom, my work would probably rather resemble a Picasso drawing. But it gives me some ideas. First pictures in the neighbourhood of this,

    #7315
    Profile photo of Tyler Smith
    Tyler Smith
    Participant

    So I have actually put a lot of thought into this because i live in a small apartment and can’t have my table out an about so I found this table. http://www.woodworkerssource.com/blog/woodworking-projects/how-to-build-a-folding-workshop-table-with-many-uses/ I like this table because it is made to be very stable (its a router table) but folds up. On thing I also liked is the exchangeable top. obviously I’ll need to work out a top that will work just right for the MPCNC but i think the potential for this will be great.

    #7320
    Profile photo of vicious1
    vicious1
    Keymaster

    I like that table. I want to make these on just a flat top an be able to either stack them on gorilla racks or put them on a base, this looks like it would work great for that.

    Cool

    #7321
    Profile photo of Ulli
    Ulli
    Participant

    Had the idea of folding the table up (around an axis through the cog, more or less) too. Folding the rails is not so promising, but the whole table could be swept up. Or lifted and stacked in a rack (Ryan, pls design a mostly printed fork lift!). I got a simple large plywood board now that I enforced (not really necessary for 21 mm thick birch playwood) with 40 by 80 (mm²) timber beams. But that frame is a good base for legs or hinges or… If the room is high enough, one could also winch up the whole affair to the ceiling.

    More on my table real soon.

    Cheers,
    Ulli

    #7322
    Profile photo of vicious1
    vicious1
    Keymaster

    I drove a forklift For more years than I care to admit to pay for school…..I really don’t want anything to do with them. Even though it never stopped feeling like I was getting paid to drive a go-cart.

    The ideal of an angled mill seems promising, it even pretty much handles the cutting debris without a vacuum! Maybe even mounted on the wall (why not)???

    #7347
    Profile photo of Jon
    Jon
    Participant

    My MPCNC is vertical. Well….almost. the cnc is built, I am now in the process of building the “table”. My table has a vacuum built in to hold down the work piece. It will be at 70 degrees. My milling dimensions are 48×48. This puts my table with extensions at 54×60. I want my table a little long for a possible add on later.

    #7352
    Profile photo of Ulli
    Ulli
    Participant

    Basically, it’s a matter of renaming two axes. Plus some remedies to keep things at their place. You have to do that anyway, but the added asymmetric influence of gravity has to be regarded. As Ryan remarked, getting rid of the debris is potentially a bit simpler.

    #19262

    Guys, how do you stick the material to the table? My ideas are:
    1. Drill some holes in the MDF which i use as table with some thread. Then use some fixators, screwed into this thread. But, making thread in the wood does not look reliable.
    2. Drill some holes and use something like a metal threaded collars, glued or fixed in the table holes. (i’ve seen something of that kind somewhere)

    are there any better/simplier ideas?

    #19281
    Profile photo of Barry
    Barry
    Participant

    I just use screws and clamps. I use the plastic printed hold downs where I think the router might go, the metal ones I use where I know the router will not get close, or where the dust shoe has to pass over.

    https://goo.gl/photos/rsGdFYbYgv94LM8j8

    I have also used superglue and painter’s tape. Put tape on your spoil board and on your material being cut. Then a bunch of superglue on one piece of tape and spray quickset on the other. Press the two pieces of tape together and hold for a second. So far nothing has come off, and even if your tabs get cut off, inside cut out pieces will stay attached.

    This is how I attached the piece of acrylic in this video.
    https://www.youtube.com/watch?v=KtqhBiFaDpQ

    #19288

    Thanks Barry! Thats an interesting method using glue, need to try this also 🙂
    Regarding the metal fixings – how do you mount them to your board? I suppose there are no nuts underneath, or ?

    Forgot to tell one important argument – in my case I assembled the CNC on the MDF board, which is supposed to be put on the other table, so it is supposed to be flat on the bottom. That’s why nuts on the bottom side do not suit me. I need something that will not increase height of my board… Mmm, maybe thats my problem, but I wanted to make CNC as portable as possible…

    #19291
    Profile photo of Barry
    Barry
    Participant

    No nuts, I just use screws wherever. I’m sure eventually it will mess up my table too much, but the spoilboard takes the brunt of it. When it comes to that, I’ll just use the router to surface off the table top and glue a new piece in place. You’re going to have a hard time keeping your machine flat without a sturdy table underneath your mdf. Not sure where you live, but some hardware stores sell slatwall that you could cut to fit your cut area. This would give you basically a row of t-tracks that you could use for hold downs.

    #19350
    Profile photo of Derek P
    Derek P
    Participant

    I have a couple of posts in the hardware section that might be useful. The first is a folding plywood table built using pocket hole joinery. The second is a U shaped tub, machine base of MDF and a spoil board.

    #20622
    Profile photo of David
    David
    Participant

    Is there any reason not to simply fix everything to a 3/4″ MDF sheet and place it on the floor to use it? I can’t think of a mode stable surface than a concrete floor…

    #20623
    Profile photo of Barry
    Barry
    Participant

    @David, but is the concrete floor flat? Most aren’t.

    #20626
    Profile photo of David
    David
    Participant

    I assumed it was flat.. it looks like it, but I guess I should go do a level test.

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