jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Jul 19, 2020 9:32:08 GMT -5
Fast wear even for glass. Glass started out at 1/2" to 5/8" thick. Note surface bruising. Material removal is so fast that burping must be performed daily or else. Bruises can be removed in one 4 day run at 30 rpm and SiC 60. Or 2 days in the vibe with SiC 500. SiC 500 surprisingly aggressive at removing surface material on glass anyway. wetted:
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Jul 24, 2020 6:33:53 GMT -5
Glass surface is deeply pitted from very coarse grit and high speeds for 5 days. Reduced from 20 pounds to 12 pounds. Big SiC 3/8" was sifted from raw Carbolon SiC for this run and the dose was doubled like 3 cups per 10 pounds. Basically it was SiC pea gravel media and most of it did NOT break down. Since the larger 3/8" SiC 'crystals' hardly break down they will be re-used. Easily separated by screening. A thought: Think standard cylinder shaped ceramic media with SiC imbedded in them, except replace them with sintered diamond cylinder media. Diamond cylinders should be reusable, wear much slower and cut yet faster than SiC that wears much quicker with use. Doubt anyone makes them. So here is the glass after being brutalized at 74rpm with few smalls and no protective media and little clay thickener for that matter. No chips, no fractures, only surface bruises that the vibe will remove. Protection from fractures, deep bruises and cracks came from using a 6 inch inside diameter barrel with 80% fill, simple as that. No need for smalls and media in step 1. Just fill barrel to 80%. The high fill rules the gentleness in a rotary. 2 days in the vibe using SiC 500 will have these ready in a jiff for pre-polish.
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djsparkles
noticing nice landscape pebbles
Member since June 2010
Posts: 79
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Post by djsparkles on Jul 24, 2020 19:14:45 GMT -5
Those are beautiful!
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
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Post by jamesp on Jul 26, 2020 6:51:44 GMT -5
Thanks djsparkles. This would be an imported hand blown batch from about a dozen countries in Europe and Asia. Average cost of an average sized 5 pound vase at a thrift store is $10. Looks like $2 per pound tumbling material. Wonder how much it cost to ship a vase say from Europe to the US ?
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