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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Nov 7, 2018 21:38:37 GMT -5
Do they cut agate?
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jamesp
Cave Dweller 
Member since October 2012
Posts: 36,602
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Post by jamesp on Nov 11, 2018 12:19:53 GMT -5
Always wondered why sphere makers did not use sintered diamond core drills.
They can be had so cheap on EBAY out of China.
You may have to buy different brands to get sintering with more aggressive diamonds.
Some diamonds are dull round crystals that cut slow.
Some diamonds are broken crystal that have razor sharp edges.
Many variations of sintered diamonds.
cool application
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loot
starting to spend too much on rocks
Member since October 2017
Posts: 111 
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Post by loot on Nov 11, 2018 12:29:45 GMT -5
Always wondered why sphere makers did not use sintered diamond core drills. They can be had so cheap on EBAY out of China. You may have to buy different brands to get sintering with more aggressive diamonds. Some diamonds are dull round crystals that cut slow. Some diamonds are broken crystal that have razor sharp edges. Many variations of sintered diamonds. cool application These cut just about anything. Granted at 50 rpm they dont cut very quickly, however with that much torque you can really, I mean really put some pressure on the stone. I only use these to get stones round and work out most of the large imperfections. Then I switch to my diamond impregnated polishing pads starting at 50 grit, then on up. Currently that succession is 50, 100, 200, 400, 800, 1200, 1500, 3000. Then leather faced cups with cerium oxide. Rouge and felt wheel for final polish. Topped of with very thin bit of renaissance wax. Sorry for blabbing. Last thing about the diamond hole saws I use. I go in 5mm increments once cups arr within 1/8 inch of touching I swap in next size smaller, if needed. Hope this helps. |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,602
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Post by jamesp on Nov 11, 2018 13:15:32 GMT -5
Always wondered why sphere makers did not use sintered diamond core drills. They can be had so cheap on EBAY out of China. You may have to buy different brands to get sintering with more aggressive diamonds. Some diamonds are dull round crystals that cut slow. Some diamonds are broken crystal that have razor sharp edges. Many variations of sintered diamonds. cool application These cut just about anything. Granted at 50 rpm they dont cut very quickly, however with that much torque you can really, I mean really put some pressure on the stone. I only use these to get stones round and work out most of the large imperfections. Then I switch to my diamond impregnated polishing pads starting at 50 grit, then on up. Currently that succession is 50, 100, 200, 400, 800, 1200, 1500, 3000. Then leather faced cups with cerium oxide. Rouge and felt wheel for final polish. Topped of with very thin bit of renaissance wax. Sorry for blabbing. Last thing about the diamond hole saws I use. I go in 5mm increments once cups arr within 1/8 inch of touching I swap in next size smaller, if needed. Hope this helps. I get ya. Figured they are only for rough shaping. I get ya. Not babbling, sphere making is the pinnacle of lapidary my friend. Rock on. Publish your round masterpieces by all means. |
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loot
starting to spend too much on rocks
Member since October 2017
Posts: 111
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Post by loot on Nov 11, 2018 13:30:39 GMT -5
Thanks. I have more preforms I did this week. Working on cleaning shop up to make room for the new machines I'm building.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,602
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Post by jamesp on Nov 12, 2018 1:09:50 GMT -5
Far out. Building your own sphere machine, a respectable project.
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SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
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Post by SirRoxalot on Nov 27, 2018 12:18:47 GMT -5
Where'd you source the motors??? I'm dying to build a sphere machine!
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Nov 14, 2024 18:17:57 GMT -5
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Nov 15, 2024 17:44:51 GMT -5
Nov 15, 2024 17:44:51 GMT -5
