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Thread: 27 Speeds External Headstock Gearbox (Free Plans and More)

  1. #1
    Supporting Member LMMasterMariner's Avatar
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    27 Speeds External Headstock Gearbox (Free Plans and More)

    Free plans for much better gearbox (27 speeds) can be found at



    Download in pdf format will be available here soon.

    W A R N I N G / W A R N I N G / W A R N I N G / W A R N I N G / W A R N I N G / W A R N I N G / W A R N I N G / W A R N I N G /
    =========================================================================== ============

    ONE MISTAKE FOUND.

    AND CORRECTED.

    CHECK CORRECTIONS.pdf


    DIDN'T HAVE THIS PROBLEM IN PREVIOUS VERSION (18 SPEEDS) AS THERE WERE 60 TEETH AND 64 TEETH GEARS IN THE SAME LINE
    AND WITH COPY / PASTE USED IN DRAWINGS, WELL S...T HAPPENS.


    Best regards
    LMMasterMariner
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    Last edited by LMMasterMariner; Aug 28, 2018 at 10:24 AM. Reason: Error

  2. The Following 21 Users Say Thank You to LMMasterMariner For This Useful Post:

    allenz (Feb 24, 2022), almarghi (Aug 28, 2018), bruce.desertrat (Aug 27, 2018), darkoford (Dec 19, 2018), DIYer (Aug 28, 2018), Frank S (Aug 24, 2018), G.Paul (Dec 18, 2018), HobieDave (Mar 19, 2020), Jon (Aug 24, 2018), Kevic (Aug 27, 2018), KickStart (Aug 28, 2018), Kimbatuk (Aug 28, 2018), marksbug (Sep 17, 2020), Miloslav (Dec 17, 2018), NortonDommi (Dec 18, 2018), philipUsesWood&Brass (Aug 27, 2018), PJs (Aug 28, 2018), rossbotics (Aug 26, 2018), Saltfever (Oct 3, 2020), Seedtick (Aug 27, 2018), Tule (Aug 28, 2018)

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    Supporting Member LMMasterMariner's Avatar
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    Plans

    Here are the plans.
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    2,000+ Tool Plans

  4. The Following 15 Users Say Thank You to LMMasterMariner For This Useful Post:

    almarghi (Aug 28, 2018), Altair (Mar 17, 2020), DIYer (Aug 28, 2018), Floradawg (Aug 27, 2018), Frank S (Aug 24, 2018), Karl_H (Aug 28, 2018), Kimbatuk (Aug 28, 2018), Miloslav (Dec 17, 2018), NortonDommi (Dec 18, 2018), olderdan (Aug 25, 2018), PJs (Aug 28, 2018), rossbotics (Aug 26, 2018), Seedtick (Aug 27, 2018), sossol (Aug 27, 2018), Tule (Aug 28, 2018)

  5. #3
    Supporting Member olderdan's Avatar
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    Thank so much for sharing your many hours of hard work, I have saved your PDFs and even if I do not copy your design it is great start point for other projects.

  6. The Following User Says Thank You to olderdan For This Useful Post:

    abditerex (Oct 12, 2024)

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    Thank you! This is a generous gift to the community.

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    Supporting Member Frank S's Avatar
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    It took me a while to remember that your input shaft RPM is not constant Since I read your lowest ratio between shaft A and shaft D as 9 to 1 the only way I could see a 25 RPM output would have been if the input were 225 meaning there had to some additional reduction somewhere.
    Is that correct?
    Never try to tell me it can't be done
    When I have to paint I use KBS products

  9. #6
    Supporting Member LMMasterMariner's Avatar
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    Quote Originally Posted by Frank S View Post
    It took me a while to remember that your input shaft RPM is not constant Since I read your lowest ratio between shaft A and shaft D as 9 to 1 the only way I could see a 25 RPM output would have been if the input were 225 meaning there had to some additional reduction somewhere.
    Is that correct?
    Yes, That's correct. There is 4:1 reduction from motor to idler pulley and gearbox input speed is constant. 293.43 RPM.
    One picture from the first post 'lathe external headstock gearbox' and screenshot from excel file attached. It took me some time until I came to magic number 225.
    Attached Thumbnails Attached Thumbnails 27 Speeds External Headstock Gearbox (Free Plans and More)-097a.jpg   27 Speeds External Headstock Gearbox (Free Plans and More)-screenshot-2.jpg  

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    Frank S (Aug 27, 2018), PJs (Aug 28, 2018)

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    Thank you so much for the plan. Just wondering if there was a 015.pdf file missing in the listing?

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    Supporting Member LMMasterMariner's Avatar
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    Quote Originally Posted by Kimbatuk View Post
    Thank you so much for the plan. Just wondering if there was a 015.pdf file missing in the listing?
    yes, there is 015.pdf, but it is totally useless. that's why it wasn't attached. no any dimensions in it.
    but there are 2 better quality plans with mm paper. 022 and 023.
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    Last edited by LMMasterMariner; Aug 28, 2018 at 03:29 AM.

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    PJs (Aug 28, 2018)

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    Thanks LMMasterMariner! We've added your External Headstock Gearbox to our Lathes category,
    as well as to your builder page: LMMasterMariner's Homemade Tools. Your receipt:




  15. The Following User Says Thank You to DIYer For This Useful Post:

    LMMasterMariner (Aug 28, 2018)

  16. #10
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    Thanks for making your work available. Do you have any videos of the gearbox in action?

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