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Steel question, Sir John

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  • Steel question, Sir John

    Sir John

    I am going to try and machie a set of rockers for my 1948 SOHC Manx Norton.
    Originals have a number forged onto them: KE805
    Am I right in asuming this refers to the material used ?
    Now, does anyone have a current cross reference to this material ?

    Regards
    Arne Eftestol

  • #2
    These people may be able to help:

    http://www.westyorkssteel.com/

    hth,

    Ian
    All of the gear, no idea...

    Comment


    • #3
      Thanks Ian, I've sent an e-mail to them.
      Fingers crossed !

      Arne

      Comment


      • #4
        Never made any rockers but we used to use EN24 plate for con rods then heat treat.

        .
        .

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



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        • #5
          Just a guess, but might be Kayser Ellison. Probably forged. Not sure about the number designation, but might get you started.
          Bill

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          • #6
            willmac

            I think you are absolutely right. Thanks a lot !
            Now, cross references anyone ?

            Arne

            Comment


            • #7
              Arne -

              Just another thought - the originals were probably forged for several reasons: Ease of production - not so much to machine (no CNC then), but far more importantly to get a good grain-flow in what is probably a rather marginal design. If you try to replace the forged part with a machined from bar equivalent material you may find that it does not perform as well as the original.

              Trying to get forgings in very small quantities in an appropriate material could be quite a challenge.

              It could be that I am misunderstanding your original question and that you are intending to modify the original rockers, in which case this is not relevant.
              Bill

              Comment


              • #8
                Willmac

                You are most probably right, they must be forged for ease of production and
                grain structure. Hwever, I do not think the design is marginal !
                The rockers has to be seen to be believed ! They weigh a ton !
                I am not modifying, I am looking to machine a pair as they are virtually
                impossible to come by.
                My question was really to find a comparable steel to machine from.
                KE805 may not be entirely relevant as has been suggested it may be a
                steel intended for forging, in that case there will probably be a better choise
                when machining.

                Arne

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