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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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<blockquote data-quote="Dughug" data-source="post: 121698" data-attributes="member: 157"><p>Lefty</p><p></p><p>sapphire to polish on either Tin Oxide or cerium oxide needs to be really fast as a lot of the polishing effect is generated by the heat created and not so much by fine abrasion.</p><p></p><p>What you tried with a 280 to 600 jump should have been do-able followed up with finer diamond for the polish.</p><p></p><p>As a facetor do you charge your own laps? If so, try 360 diamond powder mixed with a medium of sorbelene or Vaseline or baby oil etc. then treat the stone like you are skin polishing it - i.e. hard felt or wooden tips with a dremmel like rotary tool. Wooden bamboo BBQ skewers work well (cut off into 2 inch pieces). Then progress 1200, 8000, to 50,000 using the same method.</p><p></p><p>I'd leave the flat lap well alone though.</p><p></p><p>Good luck with your attempts on the star.</p></blockquote><p></p>
[QUOTE="Dughug, post: 121698, member: 157"] Lefty sapphire to polish on either Tin Oxide or cerium oxide needs to be really fast as a lot of the polishing effect is generated by the heat created and not so much by fine abrasion. What you tried with a 280 to 600 jump should have been do-able followed up with finer diamond for the polish. As a facetor do you charge your own laps? If so, try 360 diamond powder mixed with a medium of sorbelene or Vaseline or baby oil etc. then treat the stone like you are skin polishing it - i.e. hard felt or wooden tips with a dremmel like rotary tool. Wooden bamboo BBQ skewers work well (cut off into 2 inch pieces). Then progress 1200, 8000, to 50,000 using the same method. I'd leave the flat lap well alone though. Good luck with your attempts on the star. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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