alanc
off to a rocking start
Member since January 2004
Posts: 12
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Post by alanc on Jan 20, 2004 9:02:53 GMT -5
In looking at the Kingsley website, you can go as coarse as 36/100 or 46/70. Is there a reason you can't use coarser stuff for phase 1? Seems like if you can use grinders to knock off edges, this wouldn't be a problem.
Is there something that makes 60/90 optimal?
Alan
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donwrob
has rocks in the head
Member since June 2003
Posts: 509
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Post by donwrob on Jan 20, 2004 9:38:12 GMT -5
Hi Alan, and welcome to the site by the way . That is an interesting question. I really don't know the answer, but I have a theory. I was thinking about this, as I have used some 46-70 in my 15lb Thumblers. It didn't seem to do as well as the 60-90 until I experimented and ran it with less water than I use with 60-90 (someone here on the site had mentioned this before). It acted like the grit was not staying in good contact with the rocks, with a normal water level in the drum. It seemed that it just wasn't staying in the mix good and grinding as well as it should have. I figured that the larger grit pieces,being heavier, were washing off. This may be why 60-90 is the prefered grit size for average size tumble rock in everyday hobby tumblers? Just my thoughts, I'll be curious to hear if anyone else has any insight on this. If nothing I said makes any sense at all, I plead pure ignorance. Plus, I'm on midnight shift this week. Talk to you later, Don
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MichiganRocks
starting to spend too much on rocks
"I wasn't born to follow."
Member since April 2007
Posts: 154
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Post by MichiganRocks on Jan 20, 2004 12:50:06 GMT -5
I agree Don. I've tried both 60/90 and 46/70 in my 15 lb. Thumler as well and have decided that 60/90 was a better way to go. Maybe it's just my imagination, but it sure appeared that the larger grit was still lying in the bottom of the barrel in the mud no matter how long I tumbled. The rocks did not seem to shape as well either, which makes me think that some of the grit wasn't doing it's job.
MichiganRocks
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James
freely admits to licking rocks
Member since October 2003
Posts: 876
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Post by James on Jan 21, 2004 14:50:25 GMT -5
The smaller, lighter, 60-90 grit sticks to the rock better and covers more surface space. The point donwrob made about the water level seems to make a lot of sense too.
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