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  • 3/8-16 thread

    I've got a 3/8-16 bolt in which I'm trying to build a spacer for...
    Is each complete revolution of the thread .160
    Hope this makes sense
    If I was to start at a specific point on the thread and rotate the bolt 1 time would the base point moved be .160 if not what would it be?
    Thanks
    Paul

  • #2
    Paul
    Exactly 1/16th of an inch or .0625
    Rich
    Green Bay, WI

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    • #3
      Thats right
      I was thinking it was as simple as that just could not remember
      Thank You Rich

      Comment


      • #4
        The inch threads whether UNF of Whitworth or similar use fractions of an inch for their pitches and metric thread pitches are directly in millimeters.

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        • #5
          For next time it's simply 1 divided by the TPI number. So 1/4-20 is 1 divided by 20 TPI =.050" per thread or per turn.

          Chilliwack BC, Canada

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          • #6
            The OP asked if a 16 TPI thread would move .160" per revolution ,the answer to the question is no, it will move 1/16 of an inch or .0625".

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            • #7
              If you need .160 travel you could make a bolt with 6tpi and it would be close at .166

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              • #8
                I had the option to replace the mills knee ACME thread which is 5 tpi with a new length of 6 tpi, but changing from 0.200" per turn to 0.166" was not the best idea.

                Comment


                • #9
                  Originally posted by old mart View Post
                  I had the option to replace the mills knee ACME thread which is 5 tpi with a new length of 6 tpi, but changing from 0.200" per turn to 0.166" was not the best idea.
                  My Alba shaper has 6tpi lead screws for both the table axes.... What in blazes were they thinking about with a choice like that! ! ! ! After all it's not just .166 per turn. It's .1666666666666666666..... 5 or 8 would have been far better options.

                  Some time back I picked up some of the low cost IGaging DRO units. The singles with the magnetic scales. My original idea was for the mill. But with the cost of the nice glass scale units coming down I'm thinking I'll fit them to the shaper to replace the now pretty standard use of a magnetic base with a 2" dial gauge. There's no really nice and clean way of doing it though. At least nothing that I've come up with that doesn't make me simply give up in frustration at being so kludge'y.
                  Chilliwack BC, Canada

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                  • #10
                    Going off memory here,
                    but I seem to recall that
                    the elevation screw on
                    my Boyar Shultz grinder
                    is 6 tpi. There are some
                    bevel gears that change
                    direction and also make
                    the ratio so the units
                    come out to something
                    even useful per turn.
                    I always thought that
                    was interesting.

                    But yes, the math is simple.
                    Divide 1 inch by how may
                    parts you are dividing it up
                    into, and that is your unit.
                    The language is right there.
                    Threads per INCH. Threads
                    in ONE inch. Sometimes I
                    ask young engineers how
                    many thousandths are in an
                    inch. 50% get it wrong.
                    Sheesh. God save us from
                    ourselves. Today people are
                    letting the computers think
                    for them. And it shows.
                    Everyone looks for an excuse
                    to justify being lazy. It is
                    because they have too much
                    and they can't even see it.
                    Goes right back to lack of thinking.
                    Having too little is a bit easier
                    to recognize. This situation,
                    even though it is a bit harsh,
                    makes for a person with perspective
                    because they have seen the other
                    side of the coin.

                    I try to keep sharp.
                    I have a Garmin GPS in my car
                    but I study a map before I set out
                    on my journey. I like to know my
                    cardinal direction and recognize
                    landmarks, and NOT rely on a
                    "smart" device. Smart only until
                    the battery dies. That is what
                    people forget. Ever see people
                    fumbling around and asking where
                    they can plug in their phone and
                    get a charge because it is almost
                    dead? They are in a real panic.
                    Their personal pocket Jesus is
                    about to fail them. I prefer to
                    keep Jesus in my head, where
                    we can communicate any time.

                    --Doozer
                    Last edited by Doozer; 05-29-2022, 09:09 AM.
                    DZER

                    Comment


                    • #11
                      Originally posted by Doozer View Post

                      Sometimes I
                      ask young engineers how
                      many thousandths are in an
                      inch. 50% get it wrong.
                      Sheesh.

                      I try to keep sharp.
                      I have a Garmin GPS in my car
                      but I study a map before I set out
                      on my journey. I like to know my
                      cardinal direction and recognize
                      landmarks, and NOT rely on a
                      "smart" device.

                      --Doozer
                      I like to ask people "If you're going 60 mph, how many miles per minute is that?" The answer is usually a blank stare.

                      I, too, like to have a visual of where I'm going rather than rely solely on nav to get me there. When I first bought my house in the mountains I plugged my start and destination into Mapquest just for grins. The route it would have me drive went up an unpaved road that had 2 feet of snow on it. People die like that.
                      It's all mind over matter.
                      If you don't mind, it don't matter.

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