Free 30-30 cam profile for cam grinding machine - NCRS Discussion Boards

Free 30-30 cam profile for cam grinding machine

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  • G B.
    Expired
    • December 1, 1974
    • 1407

    Free 30-30 cam profile for cam grinding machine

    About 15 years ago I sent a good used GM 30-30 cam from an original HG 327 to Erson Cams in CA. I paid them about $1000 to make five accurate copies for me.

    Those cams are all gone now, but I still have the lobe profile Erson used in their cam grinding machine. I'll send it for free to anyone who wants it. Just tell me where to send it in an email to my Double Top Secret address: jerrybramlett@comcast.net.

    At the time I thought most aftermarket 30-30 cams were inaccurate. I still don't trust them completely... modern reproductions are just no damn good.

    MVC-017S.JPG
  • Duke W.
    Beyond Control Poster
    • January 1, 1993
    • 15635

    #2
    Re: Free 30-30 cam profile for cam grinding machine

    Can you measure the "heel to toe" dimension? That would be from the top of the lobe to the base circle 180 degrees across.

    The actual dimension from the GM drawing is 1.52284" nominal, +/- .004" max allowable lobe runout added to base circle tolerance.

    (The 30-30 cam is "single pattern" cam - same lobe used on both inlet and exhaust.)

    I'm interested in the ratio to lobe master to finished camshaft dimensions. I think it's an "industry standard" for most traditional mechanical cam grinding lathes.

    I think the best place for this lobe master is the Corvette Museum. You should contact them. A nice display would be the 30-30 cam engineering drawing, an actual cam grinding machine or at least a good photo, and the 30-30 lobe master. Few have any idea of how cams are designed and manufactured, and museums are meant to EDUCATE!

    Duke
    Last edited by Duke W.; March 13, 2022, 06:47 PM.

    Comment

    • Terry M.
      Beyond Control Poster
      • September 30, 1980
      • 15582

      #3
      Re: Free 30-30 cam profile for cam grinding machine

      [QUOTE=G A Bramlett (135);911085]About 15 years ago I sent a good used GM 30-30 cam from an original HG 327 to Erson Cams in CA. I paid them about $1000 to make five accurate copies for me.

      Those cams are all gone now, but I still have the lobe profile Erson used in their cam grinding machine. I'll send it for free to anyone who wants it. Just tell me where to send it in an email to my Double Top Secret address: jerrybramlett@comcast.net.

      At the time I thought most aftermarket 30-30 cams were inaccurate. I still don't trust them completely... modern reproductions are just no damn good.[/QUOTE

      Jerry,
      If you are agreeable to the museum donation, I know who to contact. I doubt they hang out on this board. Your donation will be tax deductible, just LMK.
      Terry

      Comment

      • G B.
        Expired
        • December 1, 1974
        • 1407

        #4
        Re: Free 30-30 cam profile for cam grinding machine

        I appreciate your offer, Terry, but I promised the lobe master to a member who emailed immediately after my initial post.

        Comment

        • Terry M.
          Beyond Control Poster
          • September 30, 1980
          • 15582

          #5
          Re: Free 30-30 cam profile for cam grinding machine

          Originally posted by G A Bramlett (135)
          I appreciate your offer, Terry, but I promised the lobe master to a member who emailed immediately after my initial post.
          No problem.
          Terry

          Comment

          • G B.
            Expired
            • December 1, 1974
            • 1407

            #6
            Re: Free 30-30 cam profile for cam grinding machine

            The lobe measures ~5.5" x 5.25".

            Comment

            • Duke W.
              Beyond Control Poster
              • January 1, 1993
              • 15635

              #7
              Re: Free 30-30 cam profile for cam grinding machine

              Thank-you.

              Duke

              Comment

              • Terry M.
                Very Frequent User
                • December 1, 2005
                • 176

                #8
                Re: Free 30-30 cam profile for cam grinding machine

                Mr. McManmon,
                I am the member that received the lobe master from Jerry. I would happily donate it to a museum as you mentioned. However, it would come with a condition. That is, Jerry Bramlett should get the credit and any tax deduction that might be appropriate. Just let me know how you wish to proceed. Thanks.

                Terry McCarthy

                Comment

                • Terry M.
                  Beyond Control Poster
                  • September 30, 1980
                  • 15582

                  #9
                  Re: Free 30-30 cam profile for cam grinding machine

                  Originally posted by Terry McCarthy (21187)
                  Mr. McManmon,
                  I am the member that received the lobe master from Jerry. I would happily donate it to a museum as you mentioned. However, it would come with a condition. That is, Jerry Bramlett should get the credit and any tax deduction that might be appropriate. Just let me know how you wish to proceed. Thanks.

                  Terry McCarthy
                  Terry,
                  You have mail.
                  Terry

                  Comment

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