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  • Opinions please

    http://www.rayrogers.com/rhc.htm
    To invent, you need a good imagination - and a pile of junk. Thomas A. Edison

  • #2
    Interesting but it's a Comparator. You'll need known samples to make it work and I'm not sure it's worth $17 to get the plans.

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    • #3
      This seller sold a bunch of standards yesterday & has quite a few more coming up for sale: http://cgi.ebay.com/ws/eBayISAPI.dll...508026355&rd=1

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      Barry Milton
      Barry Milton

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      • #4
        It looks like a good idea, that could be duplicated easily without the plans. Any method of measuring the depth of penetration vs. pressure will give a comparative hardness reading.

        The Rockwell and Wilson types use deadweights. Some of the hand operated types like the Ames use springs to load the penetrator.

        A simple tester could probably be made with a small arbor press as the mechanism. The trick is calibrating against a set of standards.
        Jim H.

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