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Gemstones, Minerals & Fossils
Lapidary
Best faceting prepolish lap
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<blockquote data-quote="rough2cut" data-source="post: 343921" data-attributes="member: 3816"><p>I have been making laps by annealling an 8 inch copper lap and machining out the centre. i then pour my special alloy in the centre and press it at 300 tonne. this makes it a very compact polishing section ideal for sapphire. You can substitute type metal or tin and pressing is optional. then machine both sections at once to form a rapid sapphire polishing lap. The second part is the special polishing compound I use which is very good. These days its all about the polish more than the laps. I make a special polishing kit and use high speeds of up to 2000 RPM. 8000 prepolish 100,000 final polish.</p></blockquote><p></p>
[QUOTE="rough2cut, post: 343921, member: 3816"] I have been making laps by annealling an 8 inch copper lap and machining out the centre. i then pour my special alloy in the centre and press it at 300 tonne. this makes it a very compact polishing section ideal for sapphire. You can substitute type metal or tin and pressing is optional. then machine both sections at once to form a rapid sapphire polishing lap. The second part is the special polishing compound I use which is very good. These days its all about the polish more than the laps. I make a special polishing kit and use high speeds of up to 2000 RPM. 8000 prepolish 100,000 final polish. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Best faceting prepolish lap
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