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Thread: Captain's Lathe Reverse Tumbler

  1. #1
    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools

    Captain's Lathe Reverse Tumbler

    Made reverse tumbler for my CQ6128 x 660 lathe (bigger brother of G0602) last summer.
    Followed ideas of the people who published their projects. Have seen numerous pictures
    of reverse tumblers of so many old lathes, but I was not happy with very small gaps
    between Forward / Neutral / Reverse positions which I got on my lathe.
    There was no enough space to put proper detent. (picture 1)

    Decided to make it with different design by using 3 gears. I don't claim that I am
    the first one who did it this way, but I couldn't find any picture of reverse tumbler
    with 3 gears in that order on the web. (picture 2)

    Unfortunately big gear got stuck and damaged nylon 44 teeth gear. (picture 3)

    Managed to complete job in third attempt, by using 3 smaller gears from scrapped
    motorcycle gearboxes. And it works even with damaged 44 teeth gear (picture 4)

    Needles to say that lathe plate looks like Swiss cheese after 3 attempts.
    As you can see every hole is threaded to M8. And there is a nut from other side
    for every bolt installed. (picture 5)

    Reverse tumbler in position (picture 6)

    Handle in neutral position (picture 7)

    Handle in reverse position (left hand threading) (picture 8)

    Handle parts (brass and stainless steel)
    Observe huge spaces between positions F / N / R. (picture 9)

    And finaly picture of gears which I bought in China from Taobao.com.
    All these gears for less than 15 USD. 4 gears 44 teeth module 1.5 and
    3 gears 66 teeth module 1.5. Already bored 44 t gears to I.D. 40 mm
    and made 10 mm keyway and also reduced thickness of 66 t gear to 8 mm.
    2 small 12 t gears are for another project. (picture 10 )

    Will have all metal gears in my lathe soon. That will be noisy.

    CQ6128 x 660 lathe - present condition (picture 11)

    It is just little bit more complicated than 2 gears design, (not if you
    do it once only) but works great and detent spaces are greater.
    Just like on the old lathes.

    Really hope that anything of mentioned above will help someone to improve
    his lathe. Sorry. No drawings to share. It was done without any drawing.
    That also explain couple of extra holes.

    LMMasterMariner
    Attached Thumbnails Attached Thumbnails Captain's Lathe Reverse Tumbler-01.jpg   Captain's Lathe Reverse Tumbler-02.jpg   Captain's Lathe Reverse Tumbler-03.jpg   Captain's Lathe Reverse Tumbler-04.jpg   Captain's Lathe Reverse Tumbler-05.jpg  

    Captain's Lathe Reverse Tumbler-06.jpg   Captain's Lathe Reverse Tumbler-07.jpg   Captain's Lathe Reverse Tumbler-08.jpg   Captain's Lathe Reverse Tumbler-09.jpg   Captain's Lathe Reverse Tumbler-10.jpg  

    Captain's Lathe Reverse Tumbler-11.jpg  
    Last edited by LMMasterMariner; 02-09-2017 at 08:14 AM.

  2. The Following 7 Users Say Thank You to LMMasterMariner For This Useful Post:

    marksbug (08-01-2020), olderdan (02-10-2017), Paul Jones (02-12-2017), PJs (02-10-2017), rossbotics (02-13-2017), Seedtick (02-10-2017), tonyfoale (02-10-2017)

  3. #2
    herlin's Avatar
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    Oh wow!
    Does it spin at the same speed as foward?
    One complicated design that's beyond my understanding xD

  4. #3
    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Hello Herlin,

    The only function of idler gear(s) is to change the direction of rotation.
    They do not affect gear ratio between input gear and output gear.

    LMMasterMariner

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    Supporting Member tonyfoale's Avatar
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    tonyfoale's Tools
    Neat job. I use motorcycle spray chain lube on my all metal gears, it sticks really well and reduces the noise by a large amount.

  6. The Following 5 Users Say Thank You to tonyfoale For This Useful Post:

    drivermark (02-11-2018), EclecticNeophyte (05-04-2017), Moby Duck (02-11-2018), olderdan (02-10-2017), Paul Jones (02-12-2017)

  7. #5
    Jon
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    Congratulations LMMasterMariner - your Lathe Reverse Tumbler is the Homemade Tool of the Week!

    This is a rare tool build around here (a 2014 version from Captainleeward is here), and one that we may see copied by other builders soon.

    Yet another week with not just many great entries, but a nice variety of builds too. Some picks: a GM Radio Removal Tool by nortin, an Air Compressor Water Trap by jniolon, some beautiful Planes from new member aphilipmarcou, a Small Boring Head by Metaler, a Toolpost Drilling Fixture by tonyfoale, and a highly-detailed Rotary Table Driveshaft Install by rgsparber. We also had a few nice builds from bobs409, most notably a Retractable Pen Pocket Scribe.

    LMMasterMariner - you'll be receiving one of our official HomemadeTools.net T-shirts:


    Please PM me a mailing address, black/white color choice, and size preference, and I'll get it mailed out shortly.

    And, we've added the wrench-on-pedestal award to the awards showcase in your postbit, visible beneath your username:




    Congrats again and nice job!

  8. The Following 2 Users Say Thank You to Jon For This Useful Post:

    olderdan (02-10-2017), PJs (02-10-2017)

  9. #6
    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Hello Tony,

    Thanks for advice. Will try that instead of grease.

    LMMasterMariner

  10. #7
    Supporting Member tonyfoale's Avatar
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    tonyfoale's Tools
    Congrats on your win. Well deserved.

  11. #8
    Supporting Member Paul Jones's Avatar
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    Paul Jones's Tools
    Congratulation on your win. You have an excellent series of photos and accompanying explanations. I like the way you used a sheet of white paper in the photo background to provide the part dimensions - works for me .

  12. The Following User Says Thank You to Paul Jones For This Useful Post:

    PJs (02-12-2017)

  13. #9
    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Thanks Tony.
    Quote Originally Posted by tonyfoale View Post
    Congrats on your win. Well deserved.

  14. #10
    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Thanks Paul,
    Quote Originally Posted by Paul Jones View Post
    Congratulation on your win. You have an excellent series of photos and accompanying explanations. I like the way you used a sheet of white paper in the photo background to provide the part dimensions - works for me .

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