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Gemstones, Minerals & Fossils
Lapidary
Old Prismatic faceting machine
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<blockquote data-quote="johnful" data-source="post: 379210" data-attributes="member: 11662"><p>More questions/notes.</p><p></p><p>When I checked the driver roller to wheel ratio, for each turn of the motor the lap make 1/4 turn. This means that with a 3500 RPM motor, the maximum speed that it will turn is 875 RPM. There's a variable speed controller (Minarik MA62) on mine just like in the picture of your machine. I've never found the need to run 100%, and always end up in the 40% to 50% range in the past. </p><p></p><p>The dops I originally got the machine (I inherited it in 2008) were aluminum and I don't think original. Many of them were bent. My dad had obtained the machine in the early 80s used, and was not the original owner. I really don't know exactly how old it is. In any event, I have a set of Graves dops but they are not keyed. The quill will take keyed dops, but I have not found any that look like the aluminum ones that came with it. What kind of dops do you use, and where did you get them if I may ask?</p><p></p><p>Thanks</p><p></p><p>J</p></blockquote><p></p>
[QUOTE="johnful, post: 379210, member: 11662"] More questions/notes. When I checked the driver roller to wheel ratio, for each turn of the motor the lap make 1/4 turn. This means that with a 3500 RPM motor, the maximum speed that it will turn is 875 RPM. There's a variable speed controller (Minarik MA62) on mine just like in the picture of your machine. I've never found the need to run 100%, and always end up in the 40% to 50% range in the past. The dops I originally got the machine (I inherited it in 2008) were aluminum and I don't think original. Many of them were bent. My dad had obtained the machine in the early 80s used, and was not the original owner. I really don't know exactly how old it is. In any event, I have a set of Graves dops but they are not keyed. The quill will take keyed dops, but I have not found any that look like the aluminum ones that came with it. What kind of dops do you use, and where did you get them if I may ask? Thanks J [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Old Prismatic faceting machine
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