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Thread: Eccentric Turning Setup for 3 Jaws Chuck

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    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools

    Eccentric Turning Setup for 3 Jaws Chuck

    Safe and simple. Much safer than putting various (potentially flying) objects under the jaw.
    Shims made from 1 mm thick 316ss plates.

    You can use as many shims as needed. Mathematics is simple, but you can also learn from trials and errors like I did.



    Cheers
    LMMasterMariner
    Attached Thumbnails Attached Thumbnails Eccentric Turning Setup for 3 Jaws Chuck-safe-eccentric-turning.jpg   Eccentric Turning Setup for 3 Jaws Chuck-eccentric-turning-1.jpg  
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  2. The Following 6 Users Say Thank You to LMMasterMariner For This Useful Post:

    bruce.desertrat (05-01-2019), high-side (05-03-2019), Jon (05-01-2019), SA MAKER (05-01-2019), Seedtick (05-01-2019), volodar (05-04-2019)

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    Supporting Member mklotz's Avatar
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    mklotz's Tools
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    The mathematics (which you don't seem to describe) may be simple if you're using TLAR standards but they can become complicated if trying to compute the packing size accurately...







    Actually, a much better approach is the tube method...





    Programs to do the associated math for both these methods are available on my page in the ECCENT archive.

    Better yet, do it right and mount the 4jaw which was designed for this sort of work.
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  4. The Following 4 Users Say Thank You to mklotz For This Useful Post:

    DIYer (05-01-2019), Jon (05-01-2019), Toolmaker51 (05-01-2019), volodar (05-04-2019)

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    Supporting Member LMMasterMariner's Avatar
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    LMMasterMariner's Tools
    Quote Originally Posted by mklotz View Post
    The mathematics (which you don't seem to describe) may be simple if you're using TLAR standards but they can become complicated if trying to compute the packing size accurately...



    Actually, a much better approach is the tube method...



    Programs to do the associated math for both these methods are available on my page in the ECCENT archive.

    Better yet, do it right and mount the 4jaw which was designed for this sort of work.
    You are right. Four jaws chuck should be used for this job. I have it but many people don't.
    Also, title of this post is Eccentric Turning Setup for 3 Jaws Chuck.
    Don't know if your calculations are based on arrow point like in your sketches
    or calculations are based on true geometry of the jaws.
    I am using graphic method for rough calculations of packing size.
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    Last edited by LMMasterMariner; 05-01-2019 at 10:27 PM. Reason: wrong file attached

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    Toolmaker51 (05-01-2019)

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    Thanks LMMasterMariner! We've added your Eccentric Turning Setup to our Machining category,
    as well as to your builder page: LMMasterMariner's Homemade Tools. Your receipt:




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    bruce.desertrat's Tools
    Thank you both for this! In my stack of projects is a need to machine a small offset shaft; and yes, all I have is a 3-jaw...

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    Quote Originally Posted by LMMasterMariner View Post
    You are right. Four jaws chuck should be used for this job. I have it but many people don't.
    Also, title of this post is Eccentric Turning Setup for 3 Jaws Chuck.
    Don't know if your calculations are based on arrow point like in your sketches
    or calculations are based on true geometry of the jaws.
    I am using graphic method for rough calculations of packing size.
    I like the graphics method better, the maths may be correct but have not enough time to read it let alone calculate it.


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