jamesp
Cave Dweller
Member since October 2012
Posts: 36,562
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Post by jamesp on Aug 18, 2016 7:10:28 GMT -5
Speaking of wheels. I have been told that Go Kart tyres are great for tumbler barrels. They must be racing tyres. Ordinary ones are too soft on the sidewalls. Get two plumbing plungers and feed a bolt through the bit where the handle goes and bolt them in place over the wheel rim hole. If Michelin would make a jar out of tire rubber all problems would be solved.
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huskeric
spending too much on rocks
Member since May 2016
Posts: 353
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Post by huskeric on Aug 18, 2016 7:41:06 GMT -5
Time will tell when fooling with tumbler barrels. Early wear thru on the center of the end cap or the shoulder of a reduction was my worst problems. Leakage at connections #2. Used all PVC to PVC glued joints as they were designed on the big joints. Gas pressure blowing caps #3. Used Fernco rubber caps at the smaller open end that would bulge as soon as gas started building, i.e. early warning detection. Used double band clamps on gaseous loads. Have removed the clamps and have the cap shoot 50 feet in the air on many occasions. Gained a respect for the abuse a tumbler barrel receives, especially in coarse grind. Wow! Shut the front door! 50 feet?!?! That would not be a good thing, especially down in my basement. That is a lesson I prefer to learn second-hand. What kind of rocks build up gas like that? Also, how long would you have the load running for it to build up that kind of pressure? I notice that the rocks get warm, but I've not had pressure like that on any of my stuff yet. Keeping in mind, I am a veteran of 0 full course polishes to date... And the way these run, it's not like you could put a bleeder valve in there to discharge gas, because where the heck would you put it? The only way you could even conceivably do something like that is with a HUGE diameter barrel that was filled about 40%, and you put a valve right in the center of the cap. Then you could come down and find rock snot sprayed all over the place, I suppose. I'm still trying to wrap my head around that kind of pressure from rock tumbling. I don't doubt you one iota, just amazed!
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,352
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Post by quartz on Aug 18, 2016 20:36:54 GMT -5
I looked at my tumbler after 3 days of a run and saw the end covers bulged about 3/4". Upon cracking the cover just a minimum to relieve the pressure a stream shot out of the opening far enough to hit the 9 foot ceiling in my shed, resulted in an 8 hour cleanup requirement. I believe metal fines in the starter slurry I used caused the reaction. Thought I'd use cleanings from my flat lap as a starter slurry, 20/20 hindsight works great, never again.
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glacialtilly
off to a rocking start
Member since March 2016
Posts: 13
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Post by glacialtilly on Aug 18, 2016 21:07:00 GMT -5
Geeeeezzz...and I only thought I had to worry about motors seizing and too heavy of loads!
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huskeric
spending too much on rocks
Member since May 2016
Posts: 353
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Post by huskeric on Aug 19, 2016 8:21:35 GMT -5
I looked at my tumbler after 3 days of a run and saw the end covers bulged about 3/4". Upon cracking the cover just a minimum to relieve the pressure a stream shot out of the opening far enough to hit the 9 foot ceiling in my shed, resulted in an 8 hour cleanup requirement. I believe metal fines in the starter slurry I used caused the reaction. Thought I'd use cleanings from my flat lap as a starter slurry, 20/20 hindsight works great, never again. Holy cow! That sounds like most of my home improvement projects! Awww, but that could NEVER happen to me... (Since I just put the kiss of death on myself, I'll post the pics on Monday)
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