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Re: [taigtools] Milling a dental crown - A different way to mill a part

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  • WAM
    Yea... machines like that are amazing... I recall seeing a demo vid for a Matsuura: https://www.youtube.com/watch?v=0LCaRqQ8Qf8 Tried convincing the homeowners
    Message 1 of 124 , Sep 4, 2013
      Yea... machines like that are amazing...

      I recall seeing a demo vid for a Matsuura:

      Tried convincing the homeowners assoc. that we really need 3 phase 480
      in the neighborhood.

      Didn't go over so well...

      There's a company, Isel, that Deskproto mentions that makes 5 axis
      trunnion's for desktop mills...


      Don@... wrote:

      >This may be old info for some of you, but today, I had a crown put on by a new
      >dentist. I ask if they were making the crowns there and the assistant told me
      >that indeed they did "mill" the crowns on site and I would walk out with a
      >permanent crown. MILL ? can I see? "No Problem". I could hardly wait to see
      >the machine.
      >Well, the process went something like this. Prior to doing any work on the
      >tooth, a series of photos were taken and the machine produced a very accurate 3D
      >image of my teeth on that quadrant. The camera was rested on my teeth and a
      >series of snap shots were taken. These shots were stitched together and the
      >result was a 3D image that could turned and looked at from any angle above the
      >gum line.
      >OK, this is a lot like Autodesk 3D beta I tried a year or so back. Take a
      >bunch of photos and the software stitches them together to make a 3D point
      >cloud, This was a whole bunch faster that the Autodesk beta was though, and you
      >didn't have to measure between two points and repeat to get the proper perspective.
      >Then the Dentist did the work on the tooth in prep for the crown. A second set
      >of photos were taken and the software an overlay the new stitched photo of my
      >teeth after the work with the first set. A click of the mouse gave a full 3d
      >image of my new crown. Man, that is some software package.
      >Off to the milling machine. Not exactly what I expected, actually nothing like
      >I expected. The "WORK" was a block of ceramic compound on a stem It was
      >mounted on what I later determined to be the Z axis of this machine. There were
      >two spindles, one on each side of the work pointing at each other. They were
      >the X and X' axis. Where things tripped me up at first were the spindles.
      >They didn't move in a typical Y axis move, but swept and arc, with the center
      >of the arc on the Z axis line..
      >The new crown is cut with the top, facing the X end, and the bottom, the inside
      >facing the X' end. The work only moves in the Z axis. The Y axis swept a
      >curve. The machine just cut water line cuts with the water line on the Y axis.
      >Not sure if my explanation is good, but as soon as I figure out how to upload a
      >video from my cell phone, I'll post it showing the cutting in process.
      >How does this all apply to the Taig, Not sure yet, but I have my mill, and a
      >second set base and column and some crazy ideas floating around. The big issue
      >of this, I'll call it 4D cutting, is the software, and the work alignment. The
      >software could be based on the autodesk 3D beta and some modification. Way
      >beyond me, but I'll work on a hardware version in the mean time. Maybe Rab on
      >the CNCtool kit forum might have some ideas.
      >I'll post the videos of my crown being cut as I can upload them.
      >The machine and software can be seen if you Google "Sirona Cerec MC XL"
      >I'll get the video and photos up in a bit.
    • Ryan
      Jeff, Thanks for your response. I hadn t heard of your company but your taig kit for the sherline rotary table is exactly what I had been looking for.
      Message 124 of 124 , Jan 8, 2014

        Thanks for your response. I hadn't heard of your company but your taig kit for the sherline rotary table is exactly what I had been looking for. 

        On Tue, Jan 7, 2014 at 6:57 PM, Jeffrey Birt <birt_j@...> wrote:

        Taig and Sherline both use uni-polar drivers/motors but the connectors are
        different. The 'CNC-Ready' Sherline rotary table comes sans motor. So you
        could buy the Sherline version and wire up your own motor or buy the
        Sherline version and buy just the Taig stepper motor or you could buy the
        Taig version of the rotary table which comes with the motor.

        Jeff Birt


        From: TAIGTOOLS@yahoogroups.com [mailto:TAIGTOOLS@yahoogroups.com] On Behalf
        Of Ryan
        Sent: Tuesday, January 07, 2014 3:52 PM
        To: TAIGTOOLS@yahoogroups.com

        Subject: Re: [TAIGTOOLS] CNC lathe?

        Does Sherline offer their CNC rotary table with the proper connector for the
        Taig/Microproto controller?

        On Tue, Jan 7, 2014 at 12:53 PM, Douglas Vogt <dbvogt@...> wrote:

        Easy to add a fourth axis to the Taig - a Sherline rotary table. Nick Carter
        sells a mounting bracket or you can get a tooling plate from A2Z that will
        also accommodate an adjustable tailstock (that can be slid along the plate)
        also from Sherline. I use this setup to cut clock wheels.


        From: Dave Pinella <dpinella@...>
        To: "TAIGTOOLS@yahoogroups.com" <TAIGTOOLS@yahoogroups.com>
        Sent: Tuesday, January 7, 2014 1:18 PM

        Subject: Re: [TAIGTOOLS] CNC lathe?

        Thanks Jeff. I guess I'm kinda surprised there is not more turn key type
        solutions. Let me know if you know of any Shurlines for sale.

        What would it take for me to add a 4th axis to my Taig? I guess that would
        be a rotation axis mounted on the table? Rotation about the X axis I guess
        it would be? Is that pretty easy to add?

        I'm always looking a step ahead. More than I should really... I can't help

        Dave P

        On Jan 7, 2014, at 12:25 PM, "Jeffrey Birt" <birt_j@...> wrote:

        There are a few different avenues to explore. If you want to stay with a
        Taig the basic lathe with the power feed would be a good place to start. It
        would take some work to make new mounts for the lead carriage screw and to
        get rid of the backlash. I have seen several homemade CNC lathes based on
        the Taig on line. One of Taig's employees has been building a CNC turret
        lathe based on a mill base which is interesting:
        http://www.youtube.com/watch?v=3Ri5CQ5cIj8 . Don't forget you can also
        rotate the dove tail mounting plate for the headstock and mount the
        headstock horizontally. I've also had a customer order a CNC mill with the
        lathe headstock and position several tool posts to the Taig tooling plate to
        make a sort of vertical lathe.

        Sherline has a nice small CNC lathe. The only thing I don't like about
        Sherline's design is that they tried to 'hide' the carriage lead-screw
        inside the base so the arm that connects the lead-nut to the carriage is a
        source of (potential) problems. They did just add an anti-backlash system to
        the cross feed too. For most of my customers looking for a small and
        ready-made CNC lathe this is what I try to set them up with.

        A few months ago I picked up an old Dyna 3000 CNC lathe. The original
        control is pathetic by today's standards so it will be converted to run Mach
        in the near future. The old Dyna Mechatronics machines are built like tanks
        and with a modern control fitted they are excellent machines. If you can
        find one and convert it to a PC based / Mach control it would be the biggest
        bang for your buck. They are not light weight though, the lathe itself
        weighs about 500 pounds!

        Jeff Birt

        Soigeneris.com <http://soigeneris.com/>

        From: TAIGTOOLS@yahoogroups.com [mailto:TAIGTOOLS@yahoogroups.com] On Behalf
        Of Dave Pinella
        Sent: Monday, January 06, 2014 3:42 PM
        To: TAIGTOOLS@yahoogroups.com
        Subject: [TAIGTOOLS] CNC lathe?

        I'm thinking about a small CNC lathe to go with my small Taig mill. I have
        an old Atlas lathe but I want to try some CNC.

        Any suggestions? Anything for sale?

        Dave P, near Cincinnati

        [Non-text portions of this message have been removed]

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