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Thread: Concrete VMC

  1. #21
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    Default Re: Concrete VMC

    Robot wars? Ug. I hate that show. I want to see flamethrowers, robotic arms wielding spiked balls on a chain, sparks flying everywhere, jet packs, and sharks with freaking laser beams on their heads.

    It seems like people just crashing their rc cars into each other to me.

    Perhaps if I got into it I'd change my mind. Doubtful.

    Very nice machining work though! You do make nice things! That was made from a single piece? Very impressive work.

    I'd protect the battery. If those lithium polymers get pierced they will catch on fire and smoke like crazy. I know this from an RC plane crash.



  2. #22
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    Default Re: Concrete VMC

    Quote Originally Posted by stef110 View Post
    last 2 days are spent on welding the frame, after some welding took a break to let the thing cool down a bit. Next step will be heat treading.





    stef
    Great job Stef. I really like the way your doing your X axis. Looking forward to the rest of the build. Hope it didn't cost too much to heat treat it. Can I ask what the little unused cut out tabs are for.



  3. #23
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    Default Re: Concrete VMC

    @nic this robot will have a spinning drum on the frond with hardox teethes. It will spin around 12k rpm.

    This is a render off what we are making.



    @hezz
    Those cut outs are for tyraps to nicely order wires and oil lines.
    Had a email from the treading company and it is done so now i can make an appointment with the guy, who will mill the frame.
    Bye the way the heat treading was free, the company was very helpful and found it such an awesome project that the wanted to help me with it.

    stef

    Attached Thumbnails Attached Thumbnails Concrete VMC-bequinox-jpg  


  4. #24
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    Default Re: Concrete VMC

    Hey Stef, quite a few combat robot builders who took the plunge into DIY CNC here to feed the hobby. Love your bots and your mill build!

    Zach



  5. #25
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    Default Re: Concrete VMC

    any updates on this great looking machine?



  6. #26
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    Default Re: Concrete VMC

    not yet, project is on a low pace right now due some other more important projects. Frame will be milled in the next few weeks after that i will do an update.

    stef



  7. #27
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    Default Re: Concrete VMC

    Are you still going to use concrete for the rest of it?

    I just love the way you've made the steel work so far. I wonder what would happen if you continued in the same building style for the rest of it and made it out of steel?

    I'm sure whatever you do will be fantastic.



  8. #28
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    Default Re: Concrete VMC

    Sounds great, keep us updated as you have time! Very intrigued by this machine. I have no idea what heat stress relieving costs, I guess I need to make some calls! Love the laser cut design. And I'm also curious about the pros and cons of using concrete like you are planning and continuing with steel as Nic77 suggests. Anyways, looking forward to seeing your progress. Cheers



  9. #29
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    Default Re: Concrete VMC

    Time for an update, Steel have been milled down to size. Also the mounting block for the bed and linear rails is done. Putted everything to gather to see how it fits and i can tell you really nice
    Next step will be making an nut bracket so i can test the servo motor and see how it moves.
    Enjoy the pic's

    Stef

















  10. #30
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    Default Re: Concrete VMC

    Nice. What are the bellows made from? Own design / build or something purchased?



  11. #31
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    Default Re: Concrete VMC

    They are bought, and made from stainless steel.

    https://nl.aliexpress.com/store/1202...591050600c0yhV
    Just send them your shape and dimensions and the make it for you custom.

    stef



  12. #32
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    Default Re: Concrete VMC

    Looking fantastic



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    Default Re: Concrete VMC

    Awesome work!



  14. #34
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    Default Re: Concrete VMC

    Looks Fantastic!! Thanks for the update!! Excited to see the rest when you get to it!



  15. #35
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    Default Re: Concrete VMC

    Outstanding. Be interested in hearing your thoughts/ideas on the concrete, forms and rail attachments.



  16. #36
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    Default Re: Concrete VMC

    just a small update, if you can call it like that.. Project is currently on a dead page. haven't done anything on the design.
    I do have a small movie of the first movemenst on the X axis this is at max rpm of the servo. So it should be around 15m/min.



    stef



  17. #37
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    Default Re: Concrete VMC

    Very nice. Can’t wait to see more.


    Sent from my iPhone using Tapatalk

    www.cncmachineplans.com


  18. #38
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    Default Re: Concrete VMC

    I am struggling a bit how to make the connection between the column and the base. I will cast in steel plates so i can bolt the column down to the base. the surfaces of those plates will be machined after the casting but that will never be 100% right so i need to be able to tram the column.
    what i am thinking about is put some big gub screws on each corner so i can adjust the gap between the plates to level it out. and after hat eject the gape between with some epoxy. when going for this option i think i don't need to machine those plates at all after casting.

    Those plates right now are 220x300mm each so they are really big.
    i think i have to mill in an grove and put in a big rubber open o ring around the edge. and then inject the epoxy on one side until it is completely filed.

    How do you guys think of this method?

    stef





  19. #39
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    Default Re: Concrete VMC

    I don't see why that wouldn't work.

    Do you plan on post-tensioning the column? It won't see huge loads, but the repetitive nature of what loads it does see could conceivably cause the column to crack. (I'm just thinking out loud here, with no numbers to back me up, and I'm certainly not criticizing your excellent build.)

    "All I'm trying to find out is the fellow's name on first base" -- Lou Costello


  20. #40
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    Default Re: Concrete VMC

    It seems reasonable to me also. But I've never done it.

    My preference would be to use a big steel beam(s) structure, then fill that with epoxy granite or concrete when you're done.

    An alternative method would be to use stainless steel shim tape for fitting adjustments. I have some of the stuff and I love it. Then you could put some mold release on one side and when you reassemble, the force of gravity would squish out any extra epoxy.

    But like I said, what you are proposing sounds reasonable, and could would allow for a more precise adjustment than the alternative I suggested.



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