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Gemstones, Minerals & Fossils
Lapidary
Old Prismatic faceting machine
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<blockquote data-quote="Debbie K" data-source="post: 383385" data-attributes="member: 10510"><p>J:</p><p></p><p>My coarse adjustment knob is threaded all the way through so this is not the problem. Closing the gap is the issue; as I am tightening the coarse adjustment knob it is unscrewing the bottom screw as I am having to tighten it down really hard to pinch the axle enough to keep the entire brake from rotating on it. I have to hold the bottom screw whilst tightening the knob with pliers to keep it from moving, and even then it seems to loosen as you are cutting a facet. It doesn't seem like that big of deal until you are cutting a stone with many different angles and then it is. I believe this is due to the inside of the brake being abraded over time and becoming too loose to tighten due to extremely close tolerances it was originally engineered to have.</p><p></p><p>I think before I make a new one, I'll try your fingernail polish approach to either the axle or the inside of the brake. I thought about using shellac or some thinned down metal epoxy, but the fingernail polish sounds easier.</p><p></p><p>Debbie</p></blockquote><p></p>
[QUOTE="Debbie K, post: 383385, member: 10510"] J: My coarse adjustment knob is threaded all the way through so this is not the problem. Closing the gap is the issue; as I am tightening the coarse adjustment knob it is unscrewing the bottom screw as I am having to tighten it down really hard to pinch the axle enough to keep the entire brake from rotating on it. I have to hold the bottom screw whilst tightening the knob with pliers to keep it from moving, and even then it seems to loosen as you are cutting a facet. It doesn't seem like that big of deal until you are cutting a stone with many different angles and then it is. I believe this is due to the inside of the brake being abraded over time and becoming too loose to tighten due to extremely close tolerances it was originally engineered to have. I think before I make a new one, I'll try your fingernail polish approach to either the axle or the inside of the brake. I thought about using shellac or some thinned down metal epoxy, but the fingernail polish sounds easier. Debbie [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Old Prismatic faceting machine
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