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Thread: Tiny thread checker

  1. #1
    Supporting Member mklotz's Avatar
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    Tiny thread checker

    If you make miniatures you certainly don't have to use a lot of material making a thread checker plate. This one...

    Tiny thread checker-thread_chk.jpg

    is 1.25" long and covers most of the sizes encountered in my model making. From the left, the threads are:

    5-40, 4-40, 3-48, 2-56, 1-72, 0-80, 00-90. The screw lying on the (0.75" diameter nickel) is a 00-90. Missing are the 000-120 and 0000-160, both of which are watchmaker size. I try to avoid them.

    For the benefit of the folks unfamiliar with the nomenclature idiocy of the inferial system, the diameter formula,

    OD = 0.013*N + 0.060

    for numbered screws can still be used form screws smaller than N=0. "Simply" count the number of leading zeros, subtract one and apply a minus sign. This leads to:

    00 => N = -1
    000 => N = -2
    0000 => N = -3

    so a 0000-160 screw has a nominal diameter of 0.060 - 3*0.013 = 0.021" or about half a mm.

    This is why you should never construct a nomenclature system that's terminated at either end unless that termination represents a physical limit. Naming things by size is permissible because nothing can have a negative size. Arbitrarily setting the zero at 0.06 or labeling drills with letters of the alphabet will lead to confusions like the 0000 debacle.

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  2. The Following 6 Users Say Thank You to mklotz For This Useful Post:

    Frank S (03-23-2018), Jon (03-23-2018), Metallurg33 (03-24-2018), Moby Duck (03-23-2018), Paul Jones (03-24-2018), Seedtick (03-23-2018)

  3. #2
    Supporting Member Moby Duck's Avatar
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    Moby Duck's Tools
    Does anyone know how they manufacture the threads on these very small screws? ( 0.021" and smaller)

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    Supporting Member Frank S's Avatar
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    Thanks for the thread checker idea.
    The smallest screws I ever had to work with was the 0-80. And I got a baptismal in them. it was at a company that built custom wire-line geological logging equipment. This 1 client wanted all of the gauges and instruments to be installed with polished brass bezels with from 12 to 20 counter sunk stainless 0-80 screws in them Tapping into a 3/16" thick chromed consul using the recommended #46 or 3/64" drill bits meant we were breaking a lot of taps Doug and I spent more time extracting broken taps then mounting instruments. Fortunately I ran out of the proper sized bits and decided to use a #55 .052" With as many screws as each item was to get we figured what the heck use blue locktite to keep them from loosening if need be. So I drilled and Doug taped we went from breaking a tap 1 in 10 holes for the first 10 items (15 taps in 160 Holes)to nearly zero breakage for the remaining 30 only 5 taps in 400 holes we used more taps than that but 5 was all that broke.
    I can only imagine trying to use 00-90 or 000-120 even if in .030" brass.let alone anything thicker. 0000-160? forget me. 0-80, 00-90 and 000-120 are popular in electronics like computers
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  5. The Following User Says Thank You to Frank S For This Useful Post:

    Paul Jones (03-24-2018)

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    Thanks mklotz! We've added your Thread Checker to our Model Making category,
    as well as to your builder page: mklotz's Homemade Tools. Your receipt:




  7. #5
    Supporting Member olderdan's Avatar
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    olderdan's Tools
    Quote Originally Posted by Moby Duck View Post
    Does anyone know how they manufacture the threads on these very small screws? ( 0.021" and smaller)
    Here is a link that explains it all
    How screw is made - material, manufacture, making, history, used, parts, procedure, machine, History



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

    Moby Duck (04-07-2018)

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