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Thread: 80 threads per inch fastener close-up - photo

  1. #1
    Jon
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    80 threads per inch fastener close-up - photo


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    Supporting Member TrickieDickie's Avatar
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    Now thats some fine threading

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    That's not any thread profile I've ever seen - it doesn't really even look like a thread.

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    Supporting Member DIYSwede's Avatar
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    1/4"-80 is not uncommon as micro adjusters in lab gear for optics and/ or high vacuum conditions.

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    Last edited by DIYSwede; Jul 4, 2019 at 11:33 PM. Reason: added link

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    Supporting Member TrickieDickie's Avatar
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    My lathe will cut 112 per inch never had a need to but I am going to point up a bit and give it a try.

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    Supporting Member DIYSwede's Avatar
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    -Good luck!
    AFAIK, a single-point 112 TPI threading tool would need a 1,29 thou (32,7 microns) tip radius and a 5,48 thou (0,139 mm) DOC,
    but merely choosing the right tool alloy to make that tip strong enough for 303 SS is beyond my knowledge horizon.
    Then, DIY-ing a tool grinder for that geometry and checking its precision would be quite an undertaking...
    Then making a durable tap is a whole different job.

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    Supporting Member TrickieDickie's Avatar
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    I hear ya it would have to be a fine point to cut the 0.009 pitch.



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