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I finished a little project I started a few years ago

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  • I finished a little project I started a few years ago

    I started building this CNC rotary table before I built my mill. When I had finished making nearly all the parts I decided I didn't need it and proceeded on building the mill. That was several years ago and I put what amounted to a cnc rotary table kit in a box under the bench. I decided yesterday to finish it and it didn't take very long.

    Except for the stepper motor and the shaft bearings the rest is made from stock. It uses a full diameter teflon sheet as the bearing for the worm wheel which is the base of the rotating unit. The wheel is cut from 7075-T6 aluminum which is harder and stronger than mild steel. The worm is cut from stainless steel and is supported by ball bearings.

    There are no formal adjustments for lash or play. It was designed and made with a slight preload of the worm to the wheel and with zero end play of the worm. If necessary adjusters can be fitted to slightly move the bearing blocks closer to the worm wheel. The adjusters if required are very simple, one set screw each in the end cover of the bearing blocks




    The unit has a generous supply of grease and is sealed against swarf or coolant intrusion. On the bottom right image you can see the gasket that seals the opening for the table mechanism.



    The left image shows the hob I made to cut the worm wheel. It is made of 1040 steel and hardened.

    Free software for calculating bolt circles and similar: Click Here

  • #2
    What are the plans for the threaded center hole?

    And nice work!

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    • #3
      A dead centre can be fitted there.
      Free software for calculating bolt circles and similar: Click Here

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      • #4
        I finished a little project Istarted a few yrs ago

        Evan
        Every time you post your work, it just makes me drool. You do such incredible work. That Milling machine you built, is a master piece of your work as well. I allways look forward to seeing things you have built, in part,or whole. Even when you take somthing and mod it, One example comes to mind, the drill press, that you void the warrenty, and mounted it up on your lathe,,that was priceless,

        Paul
        Paul

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        • #5
          Impressive.

          Comment


          • #6
            Like the low profile, very nice cnc rotary table.
            Is there teflon sheet on each side of the top cover plate?

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            • #7
              The teflon sheet is under the entire rotating mechanism. It is only .002" thick and the assembly is preloaded against the base and the teflon with a fine thread bolt that runs through a ball bearing on the base which locates the table against side loads. The entire unit is zero lash in all directions so I didn't bother fitting a table clamp although I have provided a mechanism to do that. The actual table clears the top cover plate by .010" inch and lightly touches the top surface of the gasket. The top cover plate is just a cover and doesn't provide support for the table.
              Free software for calculating bolt circles and similar: Click Here

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              • #8
                Very nice project, the belt guard gives me ideas for my sheet..
                Why did you put the motor on the opposite side of the table of the hand wheel? no real comment on it just wondering, I sometimes have serious problems making irrelivant design decisions.
                Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

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                • #9
                  It was the only length of belt I had that would fit the pulleys.
                  Free software for calculating bolt circles and similar: Click Here

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                  • #10
                    Very nice, Evan!

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                    • #11
                      Keep it up, Evan. Your decision to complete an old project is helping to push me towards doing the same- I really need to finish the folding guitar project I started.
                      I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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                      • #12
                        Nice work, Evan. I bow to your superior kung fu. Posts like this are one of the reasons I love this site!
                        Sometimes the professional is hidebound by tradition while the skilled amateur, not knowing it can't be done blazes a new trail. -JCHannum

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                        • #13
                          Superb work Evan and nicely finished
                          Alan

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                          • #14
                            Really nice project Evan. If I had the skill to do it, I'd pray for the patience. You are an inspiration to the board and I'm grateful that you hang with us here on this forum. It's a great board but we have several here who turn out superior work and it's fun for some of us rookie machinist to view.

                            Could you hazard a guess as to how many hours you might have into this project? I'm asking because I feel that all my projects seem to take 10 times longer to accomplish then they should. It would be useful to know if this was just whipped up or if you have many hours in to it.
                            - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                            Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                            It is true, there is nothing free about freedom, don't be so quick to give it away.

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                            • #15
                              Everything I build takes ten times longer than it seems like it should. I don't keep track of hours at all but it was more than a few days, probably a few weeks. This was made before my mill so all the parts were either turned, fly cut or milled on my SB9. That was a very slow process.

                              These days I usually finish my projects. This one was abandoned only because I judged it unnecessary at the time. I have now found that I have a use for it so I completed it.

                              I am also curious to see if I can do anything useful with it by sticking it between centres on the 4th axis on my mill which would make it a five axis machine.
                              Free software for calculating bolt circles and similar: Click Here

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