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Info What’s this symbol mean

Discussion in 'The Pub' started by James Mclaren, May 8, 2020.

  1. James Mclaren

    James Mclaren Active Member Contributing Member

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    A784FAD7-5424-4062-87F1-199D801A8BB9.jpeg Had a mate send me this pic and asked if I knew what that symbol means, I don’t, so over to you guys
     
  2. jmw76

    jmw76 Well-Known Member

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    Do you mean the symbol near the number or the one that looks like an inverted screwdriver slot?

    The symbol near the number is most likely a manufacturers mark, but I do not recognise it. The screw head symbol is like a batch or date code marker. If you look carefully there are some numbers there. A clean up would reveal them. This is fairly common practice in castings. A removable part is placed in the tool that has the batch/date markings. This is changed at each batch run.

    Peter.
     
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  3. James Mclaren

    James Mclaren Active Member Contributing Member

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    Awesome mate Thankyou for the reply
     
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  5. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Same as the Casting mark on those FZR600 forks I am getting... I wonder if it is a Yamaha Casting mark??
     
  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Heres a piston

    3LN piston.png
     
  7. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Are the Pistons (proper Yamaha items) cast or forged??
     
  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    No idea ... how do u tell?
     
  9. James Mclaren

    James Mclaren Active Member Contributing Member

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    The guy is hoping it’s a Yamaha mark, as he is trying to stock take what parts he’s got
     
  10. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Where is @Murdo when you need him :confused:
    Probably out exercising again :superman:
     
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  11. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    The same symbol is on these FZR600 front forks... so possible I guess.
    FZR600 forks.jpeg
     
    Last edited: May 8, 2020
  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    FWIW I have seen similar casting marks on plastics, perhaps metals, however they're usually accompanied by alpha numericals around the circumference to give M/Y dates of production
     
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  13. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Correct, trials bike in the forrest. :D
    The standard Yamaha pistons are cast.
     
  14. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Depends on the quality and the amount of post forging/casting machining that was done. A sandy texture, and obvious mold parting line is a dead giveaway that it’s cast. But, if all surfaces have been machined after casting, you would have to cut a slice out of the part, polish it, etch it with acid, and examine it under a microscope to tell if it was forged or cast.

    For anyone wondering...Casting is the process where metal is heated until molten. While in the molten or liquid state it is poured into a mold or vessel to create a desired shape. Forging is the application of thermal and mechanical energy to steel billets or ingots to cause the material to change shape while in a solid state.
     
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