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Thread: Mystery tool

  1. #1
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    Mystery tool

    Does any one know what this tool is? It's made by Starret and about 4" long. The little pin part turns and every revolution moves the dial one of the little line.
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  2. #2
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    Re: Mystery tool

    Revolution counter

  3. #3
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    Re: Mystery tool

    Shaft speed indicator... I've got one too. You time the revolutions with your watch for a minute to determine RPM's. Newer versions use a little rubber knob on the end to keep it spinning at shaft speed, but that one will work great for finding drill speeds.
    Last edited by whtbaron; 03-03-2019 at 09:52 PM.
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  4. #4
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    Re: Mystery tool


    Bob


    Quote Originally Posted by whtbaron View Post
    Speed indicator . . .
    Quote Originally Posted by henry42 View Post
    Revolution counter
    AKA ='s RPM . . .


    Opus

  5. #5
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    Re: Mystery tool

    I use a tire valve cap on mine since the rubber cap disappeared long ago. Must be placed at the center of the rotating shaft. Shafts that are center drilled are easiest.
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  6. #6
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    Re: Mystery tool

    Tack is right, haven't seen one of those in many moons.

  7. #7
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    Re: Mystery tool

    Thanks guys, I appreciate it.

  8. #8
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    Re: Mystery tool

    They were originally used to determine the RPM’s of the old hit and miss engines.
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  9. #9
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    Re: Mystery tool

    Quote Originally Posted by OPUS FERRO View Post

    Bob






    AKA ='s RPM . . .


    Opus
    If I remember correctly,Starrett calls it a speed indicator,although
    it indicates revolutions, not revolutions per minute. As Whtbaron
    mentioned, you need to use it with a timepiece to determine rpm.
    Seems primitive now that you can buy a cheap laser tach for
    about $15. I remember an older co-worker (tool and die maker)
    having one of those old indicators in his toolbox. Never saw him
    use it. It’s one of those tools I don’t need, but would like to have.
    I have an old mechanical tach with a cup for reading rpm and a
    wheel for reading fpm.
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  10. #10
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    Re: Mystery tool


    jpump5


    Quote Originally Posted by jpump5 View Post
    If I remember correctly, Starrett calls it a speed indicator,although it indicates
    revolutions, not revolutions per minute.

    As whtbaron mentioned, you need to use it with a timepiece to determine rpm.
    You are correct - and I stand corrected . . .

    I have only held this tool 'in my hands once' thirty-five years ago . . . and no
    one knew what it was . . .

    http://americanhistory.si.edu/collec...ct/nmah_690549

    Upon this read - I gathered it was a tool used by 'A Walker', or an 'Operational
    Foreman'
    to keep the machine 'in their charge' running within perimeters? -

    jpump5

    Thanx - for your focus - in telling what this tool actually does . . .


    Opus

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