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4th Axis with a twist, video

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  • 4th Axis with a twist, video

    I have made some additions to the 4th axis indexer unit. I mentioned already that the unit would be able to act as a lathe. Now it does. This is the first real part made on the machine with the indexing AND lathe capability. This show the unit with the part milled. I have used Lexan for a chip cover on the unit. This isn't ordinary clear Lexan, it's a product with a coating called MarGuard which is a very hard and tough coating almost like glass. It doesn't scratch easily and is extremely machinable. It also has a slight purple tint which is characteristic of machining Lexan.



    I am making encoder wheels for a motion detection/e-stop system for the machine. Limit switches don't provide enough protection. More on that in another thread soon.

    I have added a spindle motor to the indexer. It's a beer can size servo motor with ridiculous specs. It's rated up to 600 watts running over 3000 rpm up to 30 volts DC at 20 amps. Thats 3/4 horsepower in a beer can. It runs like it too. It will accelerate the spindle to 1200 rpm in maybe 200 milliseconds.



    This is the machine running in lathe mode. I have temporarily mounted a turret tool holder on the side of the head but have something a little different in mind.



    This is the finished part:



    I recommend watching the video to see how easy it is to switch modes. I have also used magnets as part of the enclosure to make access easy and instant.

    The videos are available from the new server so should download very quickly.

    This is the low res version, 10 MB, 4.5 minutes
    http://www3.telus.net/metalshopborea...s_twist_lo.wmv

    Hi res, 20 MB
    http://www3.telus.net/metalshopborea...s_twist_hi.wmv
    Free software for calculating bolt circles and similar: Click Here

  • #2
    SWEET! I can only dream of such technology. That machine is going to make you some wonderful things.
    Milton

    "Accuracy is the sum total of your compensating mistakes."

    "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

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    • #3
      Yup, looks just like an encoder disc, Very cool Ev, it really suprises me that your mill head is that solid to run a lathe tool off of, I never would have guessed, Thought it would be a chatter box but the part looks great

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      • #4
        It works fine on metal too, at least on aluminum. I haven't tried steel as I haven't built a speed controller for the spindle, yet.
        Free software for calculating bolt circles and similar: Click Here

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        • #5
          Now I see the long ribbons, what type of plastic? (im still impressed by the way ) That peice looks metal esp. when your holding it after the part off.

          I noticed you named her --- let me know when they hit E-bay and I'll see what the housing markets doing, I wonder if it makes chips hot enough to burn through the bottom of a tent? What an amazing little Mill...
          Last edited by A.K. Boomer; 02-24-2008, 12:14 PM.

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          • #6
            I thought the part was metal! Had me all confused for awhile there. What is it anyway?

            SP

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            • #7
              Black acetal copolymer, Acetron by Quadrant.
              Free software for calculating bolt circles and similar: Click Here

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              • #8
                Why does the spindle slow down when using the lathe tool ?

                .
                .

                Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                • #9
                  I haven't been this green with envy since Lyle Lovett scored with Julia Roberts !! PFS.
                  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                  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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                  • #10
                    Evan, I'm curious - is there a particular reason why you used a Minimill head over say, the headstock off of a 7" lathe?


                    HTRN
                    EGO partum , proinde EGO sum

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                    • #11
                      YOD,
                      It not new and is going to become more common in the future.

                      Greg Jackson of Tormach fame has got Seig to make him a special version of the C3 lathe to bolt direct to the bed of the Tormach.
                      I saw one of the prototypes when over in China at Christmas. Look just like a C3 but has larger feet that line up with the bed tee slots and has encoder drive to the spindle.

                      .
                      .

                      Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                      • #12
                        The spindle slows down because the servo motor is running open loop right now. I don't have a controller for it but will build one.

                        The reason I used the mill headstock is because of a mixup by LMS back when I ordered it. They were supposed to send me an R-8 spindle but sent a MT3 instead. I called them and they shipped the correct part immediately with no questions and told me to keep the other as well.
                        Free software for calculating bolt circles and similar: Click Here

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                        • #13
                          Originally posted by Evan
                          The spindle slows down because the servo motor is running open loop right now. I don't have a controller for it but will build one.
                          Ahh makes sense now, thanks.

                          .
                          .

                          Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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                          • #14
                            Originally posted by Evan
                            The reason I used the mill headstock is because of a mixup by LMS back when I ordered it. They were supposed to send me an R-8 spindle but sent a MT3 instead. I called them and they shipped the correct part immediately with no questions and told me to keep the other as well.
                            So it's a case "I had this lying around..".

                            Are you planning on adding a tailstock? It looks as though the LMS tailstocks could be easily adapted - even if they're a bit high, they're a "two piece" design, so removing the base and making a new one a bit thinner is easy enough..


                            HTRN
                            EGO partum , proinde EGO sum

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                            • #15
                              A tailstock is planned. I have everthing I need to make one.
                              Free software for calculating bolt circles and similar: Click Here

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