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Gigantesque CNC

Discussion in 'CNC Mills/Routers' started by Corey Corbin, Feb 22, 2021.

  1. Corey Corbin

    Corey Corbin Well-Known
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    Corey Corbin published a new build:

    Read more about this build...
     
  2. Rob Taylor

    Rob Taylor Master
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    Looks promising. Heavier plates are definitely a must, I have 3/4" and 1/2" on mine due to the sheer length of them, but these 3/8" look proportional to the smaller overall build.

    @Kevon Ritter also did a opposing-U C-Beam build, a year before I even started designing mine. I don't think I copied it because I didn't actually realize that was his setup until recently, but at the very least additional credit where due.

    I like the embracing of limitations, though. I didn't even try to start building CNC machines until I had a mill, lathe and oscilloscope!:ROFL:
     
    Mark Carew likes this.
  3. JustinTime

    JustinTime Journeyman
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    A Sillyscope? How does a Sillyscope comes to play with building a CNC machine?
     
  4. ljvb

    ljvb Well-Known
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    Just like everything else.. a reason to buy a new tool... :) They need a support group for people like me (... us??).. I find myself collecting tools more than using those tools to build anything.... :)
     
  5. Corey Corbin

    Corey Corbin Well-Known
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    I liked your idea of the dbl c beam setup. your project spurred the creative juices to start one like yours. But I didn't want to build something fancy with nice beautiful curves and pockets for the nuts and bolts and needed a another machine to build. Something that can be built with common hand and power tools. I also needed a little bigger machine then the current one. I wanted to place a vise in the belly of the machine if needed. I wanted to use 2.2kw spindle for the ER20 collet. Following your M4: 1510SS project with all the simulations of how aluminum flex. How too sturdy the alum ext was the question? There's various threads on filling the c beam with different materials.Sounds messy. But I was planing to try running a common steel rod that could be bought from hardware store. With the HGR20 rail on the front and a rod thru the extrusion. Threaded on both ends thru hole to the upright plate and use a nut or bolt to place a certain amount of torque running thru the c beam. Might have to file or grind a flat spot the length of the rod a bit. This idea plays off the tingle system for lead screws. Here's a crude drawing. But maybe a couple of rods thru the extrusion might rigid it up some. I am favoring the thicker rod with a internal thread and a bolt more then the all thread style.

    [​IMG]
     
  6. Rob Taylor

    Rob Taylor Master
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    CNC is just a whole bunch of high speed pulse trains, varying analog signals, and synchronized signals. The only way to have any clue what's going on in there over the course of the couple microseconds in which it happens is with an oscilloscope. A multimeter can help with "is this switch actually working?" and "is this getting power?" but that's about the extent of it.

    Should be interesting to see, I like it. I thought about reinforcing my gantry even more, but I think I'm gonna leave it for now and see how much it moves first. If it does move, I think I may try the rebar and epoxy method, but I'd look into seeing whether tension really helps a lot or not as well, just in case. My gut feeling is that it probably doesn't, because it's not like a pre-stressed concrete structure where you need the tensile force in place ahead of time to take up additional forces later in a weak material. Using epoxy or an epoxy granite type mix to fill the gap like Loctite (which doesn't stick fasteners together, it fills the threads to prevent the clearance required to move) should do the job, but I haven't looked into it much, so I'm not really sure.
     
  7. Corey Corbin

    Corey Corbin Well-Known
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    You might be right all the extra work and steel rod not going help a whole lot. So next thought is I left on back side of the c beam I left a 1/8 lip be able to place a 1/8th thick piece of sheet metal to act as binder for the 2 pieces. This is on my current machine. I had made the X axis plate a little taller so I added a 20x40 ext on top to make up the height. But I wanted to place 1/8in sheet metal just to give it stability between the 2 pieces. I thinking same thing for new machine. This was my initial idea. SO i think I am gonna subscribe to Fusion 360 for a month I would like to see if I can learn and run the simulatons and see how steel and aluminum perform.
    [​IMG]
     

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