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Gemstones, Minerals & Fossils
Lapidary
Recharging a copper lap
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<blockquote data-quote="Lefty" data-source="post: 286693" data-attributes="member: 2976"><p>Didn't see it somehow :| </p><p></p><p>It's had to say exactly - if it's only the second stone on that lap then it probably isn't a buildup of swarf.</p><p></p><p>I've scratched softer stones on a copper lap that has been heavily used for sapphire. Maybe particles of a harder stone left on the lap?</p><p></p><p>Sometimes you can overload the lap with diamond and under pressure particles can clump together to form a larger ball of grit that makes bigger scratches.</p><p></p><p>Or maybe the lap is contaminated with a few particles of a heavier grit - when you use loose grits you need to be pretty pedantic about cleaning everything in between stages, I always wipe the stone down thoroughly with metho on a tissue or paper serviette. Plus everything else and give hands a good wash.</p><p></p><p>Try giving the lap a very good clean down and re-charging it.</p></blockquote><p></p>
[QUOTE="Lefty, post: 286693, member: 2976"] Didn't see it somehow :| It's had to say exactly - if it's only the second stone on that lap then it probably isn't a buildup of swarf. I've scratched softer stones on a copper lap that has been heavily used for sapphire. Maybe particles of a harder stone left on the lap? Sometimes you can overload the lap with diamond and under pressure particles can clump together to form a larger ball of grit that makes bigger scratches. Or maybe the lap is contaminated with a few particles of a heavier grit - when you use loose grits you need to be pretty pedantic about cleaning everything in between stages, I always wipe the stone down thoroughly with metho on a tissue or paper serviette. Plus everything else and give hands a good wash. Try giving the lap a very good clean down and re-charging it. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Recharging a copper lap
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