rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Jun 2, 2010 15:29:28 GMT -5
I was just reading my latest Harbor Freight flyer and saw they have 70 grit Aluminum Oxide for $49.99 for 44 lbs for sandblasting. I checked and Aluminum Oxide is 9 on the MOHS scale with SiC being 9-9.6.
I'm aware that SiC granules break down with sharper edges where Aluminum Oxide granules round down but the price is tempting.
Anyone try 70 grit Aluminum Oxide for tumbling?
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Post by johnjsgems on Jun 2, 2010 17:28:37 GMT -5
If it doesn't stay sharp as it breaks down won't it cost more than 60/90 because of the extra aluminum you would use? Seems like you would have to recharge more frequently if the aluminum breaks down into smooth particles
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Jun 2, 2010 19:06:35 GMT -5
Absolutely!, Like John said.
Of course if someone gave it to you it could be worth it ;D
Dr Joe
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Jun 2, 2010 23:56:59 GMT -5
I tried 200 grit AO after a week it did virtually nothing to agate/jasper. Stick with SiC
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Jun 3, 2010 9:31:26 GMT -5
Thanks guys! I won't waste my money at Harbor Freight.
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Post by johnjsgems on Jun 3, 2010 14:43:40 GMT -5
Rick, that would apply to many of their products.
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Jun 3, 2010 22:15:18 GMT -5
Aw, come on...You just have to remember you get what you pay for  Dr Joe . |
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on Jun 4, 2010 13:38:32 GMT -5
Yeah, my usual rule of thumb is if is a tool I'm only going to use occasionally I'll buy at Harbor Freight but if it's a tool I'll use often or could possibly be dangerous I stick with the higher quality tools.
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