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Post by Woodyrock on Jan 13, 2009 19:03:44 GMT -5
Adrian: Oops, I forgot to calculate the barrel diameter.....my example suffered from eyesight. I did not notice the decimal..it is 5.7 mm. The formulae are good, my maths were not. Woody
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Post by rocklicker on Jan 14, 2009 2:46:29 GMT -5
Adrian, if you are in need of a 10 inch pulley with a 1/2 inch shaft size I have an extra one from a recent tumbler rebuild! You are welcome to it if it will help. Steve
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Post by rocklicker on Jan 14, 2009 2:52:22 GMT -5
Oh, and according to a book I have, a hexagonal barrel of that size should run between 18 and 24RPM. I ran mine at about 23RPM and that worked out well. I recall it was: Big pulley at 10 inches Motor pulley at 2 inches Shaft size: 1/2 inch diameter with tubing on the outside bringing it up to 3/4 inches in diameter. "A" size belt. Final speed was about 23RPM. Steve
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UtahRockHound
spending too much on rocks
Sometimes your the Windshield, sometimes your the Rock.
Member since May 2008
Posts: 301
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Post by UtahRockHound on Jan 15, 2009 0:07:25 GMT -5
The tumbler I just finished building has a barrel of 16 inches. It is the same as rockliker just mentioned except for the final shaft. I go back up to a 2 inch roller shaft. The reason is, it is very heavy. When loaded, it weighs around 75 pounds. I need the thickness for strength.
Not sure the RPM, but I would guess it turns at around 20 or 30 a minute. You can hear the rock inside. It is taking a good beating at a steady pace. I am thinking it might be to much for a final finish.
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Post by Hard Rock Cafe on Jan 18, 2009 13:36:16 GMT -5
URH, what are you using for a barrel?
I'd love to rebuild my tumbler, but finding large barrels continues to be a challenge.
Chuck
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UtahRockHound
spending too much on rocks
Sometimes your the Windshield, sometimes your the Rock.
Member since May 2008
Posts: 301
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Post by UtahRockHound on Jan 19, 2009 11:53:11 GMT -5
I kind of cheated for my Drum. When I first built the tumbler this fall, I was using a 5gl plastic bucket. The first bucket lasted a week, then stopped turning. I come out in the morning, and the shaft has ate a hole in it. I grabbed another bucket, cut up a inner tube, then stretched it around the bucket. It lasted a week, then the rock ate through it from the inside.
Enough of plastic, I had a 3 foot section of 16 inch, 3/8 steel pipe. I cut a 16 inch section, then welded ends on it. I made a hexagon lid, and drilled and tapped bolt holes, to secure the lid. The barrel weigh around 25 to 30 lb. Works great, but is real noisy.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 19, 2009 13:16:04 GMT -5
Enough of plastic, I had a 3 foot section of 16 inch, 3/8 steel pipe. I cut a 16 inch section, then welded ends on it. I made a hexagon lid, and drilled and tapped bolt holes, to secure the lid. The barrel weigh around 25 to 30 lb. Works great, but is real noisy. Hi UtahRockHound, in order to reduce the noise level you could line the inside of the barrel with Latex / neoprene rubber sheeting or even a garden pond pool liner also can be done with a knackered dry / wet suit & super-glue it to your steel barrel. Alternately you can soundproof the the barrel externally using cardboard egg trays the type that hold 2 dozen eggs that are sandwiched between 2 pieces of cardboard make the best low cost sound proofing that is even used in music recording studios here in the U.K, basically you make a box that fits over the barrel with slot to go over drive bars. If it is still too loud keep adding another egg tray and card layer to the sandwich until the noise level is relatively quiet.
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