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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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<blockquote data-quote="Dughug" data-source="post: 121722" data-attributes="member: 157"><p>Lefty,</p><p></p><p>I see by your post on ALF you gave the flat lap a burl - & you said it scratched like crazy - trial & error is one way to find out what does & doesn't work.</p><p></p><p>I presume you have the bonded belts on an expanding drum which may account for the orange peel effect as when you "push" the stone in to cut the rubberised drum tends to form around the stone and cuts unevenly- particularly where the sapphire crystal has grown. </p><p></p><p>You could try a hard disk with wet & dry sandpaper, say around 300 or so to take out the orange peel effect if you have a buggared bonded belt try cutting it up & using it on the disk this would stop the deforming of the belt and give an even cutting surface with perhaps a lesser chance of the softer areas cutting quicker.</p></blockquote><p></p>
[QUOTE="Dughug, post: 121722, member: 157"] Lefty, I see by your post on ALF you gave the flat lap a burl - & you said it scratched like crazy - trial & error is one way to find out what does & doesn't work. I presume you have the bonded belts on an expanding drum which may account for the orange peel effect as when you "push" the stone in to cut the rubberised drum tends to form around the stone and cuts unevenly- particularly where the sapphire crystal has grown. You could try a hard disk with wet & dry sandpaper, say around 300 or so to take out the orange peel effect if you have a buggared bonded belt try cutting it up & using it on the disk this would stop the deforming of the belt and give an even cutting surface with perhaps a lesser chance of the softer areas cutting quicker. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Star sapphire advice needed
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