Forums Techniques, Tricks, and Tips Stone on Lap

2 replies, 2 voices Last updated by wilbertfwebb 6 years, 5 months ago
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    • #3668


      Never start the LAP rotation with the stone touching. Twice I’ve done this and when the angle of cut is down around 14 degrees there is a very good chance the stone will bite into the LAP and the GEM will be ruined or you will need to recut. I was one cut to go before the table and (Bang) my stone was touching when I started the rotation. If you look closely you I attempted to salvage the gem but the damage was too deep and the girdle cut still shows the damage.

      Bert Webb
      Sophia, N.C.

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    • #3673

      Alan Balmer

      Bert, which side of the lap are you cutting on? The rotation should always be in the direction the dop is pointing. In the reverse direction, it will certainly grab at low angles. Depending on the machine, it could actually cause damage to the hardware.

      \ dop
      _________> lap rotation

    • #3675



      My eyes have just been opened. Thanks very much. I switch rotation often and I never gave it any thought that this caused my issue. 🙂


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