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Thread: Timber Threads

  1. 5th December 2016, 09:54 AM #1
    DaveTTC's Avatar
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    Default Timber Threads

    Im sure this topic had had plenty of discussion but I have not been able to find what I'm after.

    For making timber threads internal and external how much difference does thrrad type make?

    These are sample threads I found on the net



    Is a square thread premium for strength?

    The area of most interest to me is for clamps and vises.

    Edit: Also appreciate any input on good timbers to use

    Dave TTC
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    Last edited by DaveTTC; 5th December 2016 at 07:22 PM. Reason: Extra question
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  3. 5th December 2016, 07:10 PM #2
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    Most clamps and vises in metal use Acme for strength and long pitch (hence rapid action). I expect the same would apply in timber.

    According to Machinery's Handbook, so-called translational (vs. fastening) threads are usually square, Acme and buttress. Square is most efficient, but also most difficult to produce because of parallel sides; also can't be adjusted for wear. Buttress is usually for one-directional loading.

    Most threads in wood, however, use sharp V, because taps are available, as well as thread chasing tools (e.g. Sorby); also 60-degree cutters are available for large diameters in threading machines. For Acme or buttress, you'd need special cutters, or simply carve by hand.

    Cheers,
    Joe
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  4. 5th December 2016, 07:18 PM #3
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    Thanks Joe

    I should also have asked views of timber to use

    Dave TTC
    Turning Wood Into Art
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  5. 5th December 2016, 08:53 PM #4
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    Default Timber Threads

    Get Ye a copy of the Australian wood review(in the news agent now)
    And read Ian W article [emoji3][emoji3][emoji3][emoji849]

    Cheers Matt

    And if you promise to be good I let you look at my engineering books
    Next time I see you at our place [emoji106][emoji106]
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  6. 5th December 2016, 09:09 PM #5
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    Sounds like I'll have to fork out for it

    Dave TTC
    Turning Wood Into Art
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  7. 5th December 2016, 09:24 PM #6
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    Tho you have missed the first part
    It was a two part article ??
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  8. 5th December 2016, 09:26 PM #7
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    Ill have to fork out twice

    Dave TTC
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  9. 5th December 2016, 09:37 PM #8
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    Such is woodwork lol
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