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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.

    2000 Tool Plans
    Regards, Marv

    Home Shop Freeware

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

    Frank S (Mar 23, 2018), Jon (Mar 23, 2018), Metallurg33 (Mar 24, 2018), Moby Duck (Mar 23, 2018), Paul Jones (Mar 24, 2018), Seedtick (Mar 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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  4. #3
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    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 KBS products

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

    Paul Jones (Mar 24, 2018)

  6. #4
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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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    Moby Duck (Apr 7, 2018)

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