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Rotary CNC

Discussion in 'CNC Lathes' started by Jon Norris, Apr 4, 2016.

  1. Jon Norris

    Jon Norris Journeyman
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    Jon Norris published a new build:

    Read more about this build...
     
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  2. stargeezer

    stargeezer Veteran
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    A very cool concept. If you can without too much effort, how about posting your design image so that we can roll it around to other views. If you're not comfortable with doing that, I completely understand.

    I've been tossing around a lathe idea for some time and I'm looking for inspiration to push me to the build bench.

    Thanks again,
    Larry
     
  3. Jon Norris

    Jon Norris Journeyman
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    Here you go. This was my very first attempt at Sketchup so I was just focusing on the main framework and not worrying about showing all the little connectors. I initially overengineered things and had a much bigger framework, but Rick 2.0 helped me strip it down to what he considered to be something that was strong enough without going overboard. Anyway, as you can envision, it will be held together with a bunch of cast corners and T nuts. Also, per Rick's suggestion, I'm switching the gantry plate on the X axis from the small one that comes with the bundle to the larger universal gantry, but that isn't shown in this Sketchup file.
     

    Attached Files:

  4. stargeezer

    stargeezer Veteran
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    Thanks Jon, I can't wait to dig into it.
     
  5. stargeezer

    stargeezer Veteran
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    Hi Jon. I was wondering if you had any pics of your machine yet? A few pics might answer some minor questions that I have.

    Thanks again for a great build.
    Larry
     
  6. Jon Norris

    Jon Norris Journeyman
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    Larry, I just finished putting it together (mostly) and got it wired up on Tuesday. Still have a bit of work to do before I attempt some cuts with it, but I'm happy with progress. Is there something particular you want pics of? I can shoot some when I get back to the house.
     
  7. stargeezer

    stargeezer Veteran
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    I'm mostly concerned about how the z axis is connecting to the machine. Mostly, I'm just very curious hows it going.
     
  8. Jon Norris

    Jon Norris Journeyman
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    My Z axis connects to the X axis exactly the way they show in the C Beam machine construction video. The vertical C Beam for the Z axis is bolted to a Universal Gantry Plate, and that is moved by the X Axis. I took a lot of guidance from that video and just modified where needed. I'll try to get some pictures of it soon. In the meantime, I'm shopping for router bits, and I'm about to cough up the $700 for VCarve so I can start cutting.
     
  9. stargeezer

    stargeezer Veteran
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    I'm not so sure I'd go that way, unless you have too. The Ox is a much better machine. IMO
     
  10. stargeezer

    stargeezer Veteran
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    Boy, I sure miss-read that post Jon. :oops:o_O

    Vcarve is a great program.
     
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  11. Joe Santarsiero

    Joe Santarsiero OB addict
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    Looking forward to seeing your work Jon.

    How do you plan on aligning the Z and A axis?
    What's the overall height of the rotary axis components as received?
    I've been debating with myself over these rotary axis packages and homebrewed solutions utilizing reduction gearboxs. The latter of which I'd have to consider the motor to gearbox coupling and gearbox to some kind of chuck (that probably hasn't been invented yet!). I have about 6" from Z to table and I'm wondering if one of these guys might bolt right between or if I'll have to raise the machine.

    Keep us updated on your successes and failures.

    Joe
     
  12. Jon Norris

    Jon Norris Journeyman
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    Stargeezer, no worries at all.

    Joe, sorry for the delay responding. I didn't see your comment until just now. I've got everything aligned pretty well. I'll try to explain what I did, and I still need to shoot some better pics of things, but I'll try to get that done soon.

    First off, for the rotary components, I got them on ebay from China. There are some tiny ones on there, but this is one of the larger ones. The chuck itself is 100mm, and the center of it sits at 65mm high, so giving it a little clearance on top too, it fits in a space of about 130mm -- about 5.5 inches. If you want the link to the exact one I bought, let me know.

    Alignment wasn't too tricky. The rotary components have a slight groove in their bases that is 40mm wide. I took a piece of CBeam with the open side facing up and dropped in a piece of 40x40 rail. It fits perfectly and is held together by some cast corners on each end. That piece of 40mm rail fits right into the groove on the headstock and tailstock bases, and they slide on it just as they would on a traditional lathe bed. I've got the headstock bolted into place, but the tailstock needs to move to accommodate different sized work pieces, so it's screwed into a couple tee nuts so I can loosen and move when needed. Anyway, I used the live center on the tailstock for alignment. I put a small bit in my router, moved X all the way to one end, lowered my Z axis until it was the same height as the point on the tailstock center, and then moved the X/Z assembly slightly forward or backward until the bit and the point on the center touched. Move everything to the other end and repeat. The trickiest part was adjusting the height of the X axis on each end to get it perfectly perpendicular to the lathe bed, but I've got it about as close to perfect as I can manage. If you use a piece of 40mm wide beam to line up your headstock and tailstock, that will raise everything up just a little, and it might mean that you have to raise your Z axis a little bit. Just depends on how you set everything up.

    Anyway, I've spent the last two weeks tweaking and experimenting since this is my very first attempt at CNC. So far, everything is working like a dream, mostly thanks to VCarve being a great piece of software. I just started using the machine for a basic production job yesterday, and I've got to generate some more Gcode this morning for the next step in my production process. All in all, this has been a great investment, and I think it's going to revolutionize my work, especially once I get code written for all of my projects and can just let the machine do its work instead of constantly experimenting.
     
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  13. Jon Norris

    Jon Norris Journeyman
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    Here are a few pics:
    Rotary-cnc1.jpeg Rotary-cnc2.jpeg Rotary-cnc3.jpeg Rotary-cnc4.jpeg Rotary-cnc5.jpeg
     
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  14. Joe Santarsiero

    Joe Santarsiero OB addict
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    That's pretty sweet Jon.
     
  15. eddiejr

    eddiejr Journeyman
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    Nice build. Did you get it from "prettyworkshop"? Head: 4 jaw and Tail: type C, correct? Before undertaking this build, did you consider converting an existing lathe to CNC (i.e. HF, Grizzly, Jet, etc.)? Thanks for sharing. -Eddie
     
    #15 eddiejr, Jun 12, 2016
    Last edited: Jun 12, 2016
  16. Jon Norris

    Jon Norris Journeyman
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    Eddie, my headstock and tailstock came from a seller called gold-bucket. They're based in China, but have a warehouse in California, so shipping is much faster. The headstock does have a 4 jaw chuck. It cost a little more, but I needed that so I could grab square blanks a little easier.

    I thought very briefly about converting an existing lathe to CNC, but it just didn't make sense for what I was doing. I've got 4 lathes in my workshop set up for different purposes, but I wanted this CNC to be set up more for instrument-specific carving than traditional turned work. I've got a Vega duplicator on one of my lathes, and I even thought about trying to convert it too since it's basically a router on a horizontal axis, but it was a lot faster and easier to just build this machine from scratch. This CNC is rounding my square blanks before doing the carving, so it completely replaces the duplicator. I'll probably sell the duplicator, and it'll cover a decent chunk of the cost of building this machine.
     
  17. Bridge Port

    Bridge Port Well-Known
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    Would love to see some photos of the woodwinds that you are making.
     
  18. Matt Miller

    Matt Miller Well-Known
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    video in action would be awesome!
     
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  19. Giarc

    Giarc Master
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    Hmmm... My spindle goes all the way to the front edge of my CNC build. Maybe I should mount a head and tail stock at the front. I have the required z travel if necessary. I could just have a switch which changes the Y axis to the rotary axis. Now you have me thinking of how to modify before I am even 100 percent finished.:thumbsup:
     
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  20. Jon Norris

    Jon Norris Journeyman
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    I'll get some pics when I have a chance. I'm in the middle of crazy festival season right now -- 4 shows in the next 5 weeks.

    I'll get some video at some point as well. At the moment, it's pretty boring. I'm basically taking square blanks that have been hollowed, turning them round on the CNC, and then drilling pilot holes for finger holes. Then the flutes go to some other machines for other processes, and then sound mechanisms and tuning are done by hand. It's a LOT more productive than doing all the rounding on the lathe though. This machine alone has probably cut my production time in half.

    Another quick update: I just bought a little laser engraver module from JTech that I'll be adding in order to burn on my logo, date, key of the instrument, etc. I've been doing that by hand as well, using a series of torch-heated brands, most of which I cut myself with a little jeweler's saw.
     
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  21. elcanadian

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    Hi Jon, I was wondering if you would possibly share the settings you used for the tinyg? I have what looks to be a very similar rotary axis and a Tinyg but am not sure of some of the settings. In particular the $4tr and $ara values, the documentation has had me going in circles :).
     
  22. selkov

    selkov New
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    Ok, now you did it. Now I got to build one too!
    Can you share the links where you bought the head stock and tail stock?
    Also the engraver.
    I do not do woodwinds but my application is basically the same.
    And how would you feel about being my mentor on this build as I copy you?
    I have never yet built a unit but what I want is what you built with the addition of the z axis [x,y, and z].
    Gonna need to start saving $ for the build, what did it all total out to - without the software and spindle?
     
  23. Jon Norris

    Jon Norris Journeyman
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    The TinyG documentation for rotary setup is definitely lacking. I'll get those settings for you next time I fire up the machine.
     
  24. Jon Norris

    Jon Norris Journeyman
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    Just replied to your private message with details. I'll try to get all the relevant links together at some point and update the build documentation. Three more weeks of festival season and then I'm home for a few months so I can catch up on all of this and hopefully have time to shoot a little video for people who are interested.
     
  25. selkov

    selkov New
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    Thanks
     

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