Large Metal Disc Found in Old Driveway
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  1. #1

    Aug 2017
    SW MO
    Garrett AT PRO, Garrett Ultra GTA 500, Equinox 600
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    Metal Detecting

    Large Metal Disc Found in Old Driveway

    Another what is it for you fellow Tnet members since you are so good

    Metal disc, heavy, seems to be a silver metal that is coated? Has the numbers 1 thru 0 on one side. The only hole that goes through is the center one.

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  2. #2
    us
    Jun 2007
    Central Wisconsin
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    Metric sun dial?
    bologna321, chub, Hawks88 and 2 others like this.

  3. #3
    Charter Member
    ca
    Detect everyday like it's the last day of the season!

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    I'm thinking it's some type of scale weight, but to what I don't have a clue.

    Dave
    Hawks88 likes this.
    “I won't be wronged. I won't be insulted. I won't be laid a-hand on. I don't do these things to other people, and I require the same from them.”
    “Courage is being scared to death, but saddling up anyway.”
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  4. #4
    us
    Lost?Mind

    Feb 2015
    Greenville, South Carolina
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    Metal Detecting
    I don't what it is, but it looks like it has 2 counterbalance holes in the front face toward the outside edge. Very interesting. Thanks for posting.
    Bigcypresshunter and Hawks88 like this.

  5. #5
    us
    Hunter

    May 2018
    San Antonio, TX
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    Too me it looks part of an old weight scale dial.
    Last edited by HuntH2002; May 25, 2019 at 05:02 PM.
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  6. #6
    us
    youtube.com/c/BigCypressSwamp

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    Quote Originally Posted by marion moore View Post
    I don't what it is, but it looks like it has 2 counterbalance holes in the front face toward the outside edge. Very interesting. Thanks for posting.
    Yes it does so that tells us that its something that turns. Could it be a crankshaft harmonic balancer pulley?
    Hawks88 likes this.

  7. #7

    Aug 2017
    SW MO
    Garrett AT PRO, Garrett Ultra GTA 500, Equinox 600
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    Quote Originally Posted by mick56 View Post
    Metric sun dial?

    Haha

  8. #8

    Aug 2014
    California
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    Wait ... if we have 24 hrs. in a day, here in the states ... how many hrs. are in a day in England ?
    I'm beginning to realize I've gone through life without knowing what anything is ...

  9. #9
    us
    Aug 2015
    South Florida
    Garrett GTI-2500
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    Metal Detecting
    Interesting...
    I note that the center shaft is not indexed.
    That would mean the numbering is relative, and not absolute (i.e., keyed to a particular shaft rotation).

  10. #10
    Every artifact has a story, if we're willing to listen

    Aug 2017
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    The center hole has a circular rust pattern surrounding it indicating that whatever this is, it might have held in place by a bolt and washer.
    Reanm8er likes this.

  11. #11
    us
    youtube.com/c/BigCypressSwamp

    Dec 2004
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    Quote Originally Posted by invent4hir View Post
    The center hole has a circular rust pattern surrounding it indicating that whatever this is, it might have held in place by a bolt and washer.
    Yes and in case I didnt explain it well, those 2 holes that are partially drilled are to remove weight to create a perfect balance during rotation.
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    Im not sure what the numbers would mean, like was said its not keyed, but I think there would be no reason to balance it so precise unless it revolved at high speeds. I have seen those drill holes before many times. All you have to do is look at any harmonic balancer. And yes it would attach in the center with a bolt.
    Last edited by Bigcypresshunter; May 25, 2019 at 11:16 PM.
    Hawks88 and tamrock like this.

  12. #12
    us
    steve andermatt

    Apr 2013
    California
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    Maybe some type of surveyor marker.
    Hawks88 and Rawhide like this.
    back of the boat

  13. #13
    ca
    Hawks88

    Aug 2012
    Niagara falls
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    I agree with harmonic balancer. The pulley for the belt or multiple belts would be mounted to the front and center of that balancing weight. The holes were drilled to perfectly balance it to reduce vibration. ( IMO ).

  14. #14
    us
    Priv8ear

    Aug 2018
    Shenandoah Valley Va
    WW2 Mine Detector, 2 Garrets and an Underwater Fisher (Older Machines)
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    Right on Bch and hawks!

    When something is balanced like this, it usually rotates at high RPM. Since it's not indexed the balance only affects the wheel and not the shaft. Another alternative is perhaps a component from a combo lock. The holes are not for balance but to allow the wheel to move the tumblers. The lock would have featured a cover over the front with a small window to read the number. Elgin made some wrist watches like this called "Hour Up" design.

    Cool find Bologna!
    Bigcypresshunter and Hawks88 like this.
    Phil

  15. #15

    Aug 2014
    California
    De Havilland Canada DHC-7-102 Dash 7 - Fugro
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    I'm mostly agreeing with the analysis ... but let's examine "indexing" and see if we can continue to discount it, just in case.

    Bologna, could you give the back of the wheel a close eye and look for the following?

    (Let's imagine a hub and spindle ... pulled tight by a nut on the other side.)

    Do the four holes look sharp and deep enough to keep a hub from spinning ?
    What's the square looking anomaly ... is there any sort of "tab" associated ?
    How about alignment marks ... any tiny groove or nub anywhere around the inner rim ?

    They don't LOOK like they are a factor in the picture, but it wouldn't take much to prevent spinning, ... which might apply to the balancing holes on the face.


    Click image for larger version. 

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    Hawks88 likes this.
    I'm beginning to realize I've gone through life without knowing what anything is ...

 

 
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