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Re: [multimachine] Re: lapping

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  • Chris Tofu
    Why is the surface plate going to wear at all? When scraping or lapping with a compound (not affixed to anything), you do need 3 plates, or 2 if a) they re
    Message 1 of 5 , Jun 11, 2013
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      Why is the surface plate going to wear at all?

      When scraping or lapping with a compound (not affixed to anything), you do need 3 plates, or 2 if a) they're square, and b) you rotate a plate 90 degrees every 3 step. To eliminate the tendency of concavity in 1 (or 2) plates.

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      On Tue, Jun 11, 2013 6:43 AM PDT Charles Mitchard wrote:

      >Very true Pierre I should have made that distinction/,/ thanks./
      >//
      >
      >//Re: lapping//
      >//Mon Jun 10, 2013 8:14 pm (PDT) . Posted by://
      >//"Pierre Coueffin" darkblood_//
      >//If both the surfaces have similar hardness, you will see this effect.//
      >//
      >//If you lap aluminum on emery paper spray glued to a granite plate, the//
      >//aluminum will wear much faster than the granite.../
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