panamark
fully equipped rock polisher
Member since September 2012
Posts: 1,343
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Post by panamark on May 1, 2016 16:48:06 GMT -5
yes, it looks like Niagara is right up there for the US. That surprises me. Thx
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on May 1, 2016 17:03:41 GMT -5
yes, it looks like Niagara is right up there for the US. That surprises me. Thx The Washington Mills salesman told me, and I was surprised. Posted that by memory of what he said. Figured Niagara was long defunct. I think the geology was optimum and allowed them to construct the facility cheaply. It takes a crap load of power to make SiC also according to him.
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sschus87
starting to shine!
Member since November 2015
Posts: 49
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Post by sschus87 on May 1, 2016 21:12:21 GMT -5
USPS very liberal about allowing bulging FRB's. Can't remember if box was bulging. 10" X 10" X 10" box = 1000 cu in. LFRB 12" X 12" X 6"= 864 cu in. At an SiC density of 3.2 grams per cubic centimeter the 1000 cu in box should hold 115 pounds of SiC. 10" = 25.4 cm, so 25.4 X 25.4 X 25.4 = 16,387 cu cm X 3.2 grams/cu cm = 52438 Grams/454 grams per pound = 115 pounds LFRB = 30.4 cm X 30.4 cm X 15.2 cm = 14, 084 cu cm X 3.2 grams/cu cm = 45,069 grams/454 grams per pound = 99 pounds. Calculation seems off. SiC does have a density of 3.1 to 3.2 grams/cm. i.e. heavy. Mistakes ?? Must have screwed up somewheres... And I always thought that the math we learned in high school would never be needed. Glad one of us paid attention!! Thanks---Steve
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on May 2, 2016 5:55:02 GMT -5
USPS very liberal about allowing bulging FRB's. Can't remember if box was bulging. 10" X 10" X 10" box = 1000 cu in. LFRB 12" X 12" X 6"= 864 cu in. At an SiC density of 3.2 grams per cubic centimeter the 1000 cu in box should hold 115 pounds of SiC. 10" = 25.4 cm, so 25.4 X 25.4 X 25.4 = 16,387 cu cm X 3.2 grams/cu cm = 52438 Grams/454 grams per pound = 115 pounds LFRB = 30.4 cm X 30.4 cm X 15.2 cm = 14, 084 cu cm X 3.2 grams/cu cm = 45,069 grams/454 grams per pound = 99 pounds. Calculation seems off. SiC does have a density of 3.1 to 3.2 grams/cm. i.e. heavy. Mistakes ?? Must have screwed up somewheres... And I always thought that the math we learned in high school would never be needed. Glad one of us paid attention!! Thanks---Steve Then got a mouth full of it to get a BS in mechanical engineering. Conversion factors taught in HS more challenging than calculus and diffeq's lol
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zrock1
off to a rocking start
Member since January 2016
Posts: 24
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Post by zrock1 on May 3, 2016 23:09:50 GMT -5
Gezz Maby I should order that grit. What ever I'm tumbling now is frigging hard. 4 weeks adding more grit every 2-3 days and they still look like they could use another month or more. I grabbed some crap gravel out of the driveway to use as filler and it ground down in 2 days..lol
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,158
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Post by jamesp on May 4, 2016 6:12:59 GMT -5
zrock1, no matter what grit you use on hard rocks it takes 6-8 weeks and 8 grit additions as a minimum for decent shaped rocks. Guessing 30 grit is maybe 30% faster than 80 grit at best.
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