tippy1
off to a rocking start
Member since October 2008
Posts: 15
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Post by tippy1 on Oct 26, 2008 16:18:11 GMT -5
Hi just bought 2 barrels at 5" dia. what RPMS should I make them spin at? Any help appreciated!
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tippy1
off to a rocking start
Member since October 2008
Posts: 15
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Post by tippy1 on Oct 26, 2008 16:25:28 GMT -5
Also whats the biggest rock dia I should put in there? & when people go by LBS in a tumbler is that incuding the weight of the water?
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huffstuff
fully equipped rock polisher
Member since August 2007
Posts: 1,222
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Post by huffstuff on Oct 26, 2008 17:16:16 GMT -5
Some others will chime in, I'm sure. I hope! I try to only put 3 lbs total in my 3-lb tumbler, because I had a motor die on me. I realized my batches were 4 lbs total, but I don't know if that was what killed the motor. Sometimes my loads seem small, only half full instead of the 2/3 or 3/4 they're supposed to be, and then they eat grit like crazy. So it's a guessing/balancing game. Right now I am doing a batch of mostly glass and some rock, so the weight is not a problem.
Others.... I don't know the rpm.
Amy
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Post by deb193redux on Oct 26, 2008 17:16:24 GMT -5
Yes, including water. I would not put in anything more than 1/5 the diameter of the barrel, and always with smaller stuff. I think about 40rpm.
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Post by Jack ( Yorkshire) on Oct 27, 2008 4:19:40 GMT -5
Hi Tippy 1
Rpm that I run at is 42 RPM for 6lb barrel (simular to Deb above) any where between 60 RPM to 35RPM
Rpm is important if yours is a home made job
Rpm from the Victors book are
10" 42 Rpm
7" 50 RPM
Go to fast and it will fracture go to slow and they wont tumble just slide and wearflat
I hope others with more experiance will chip in and advise
Jack
Yorkshire UK
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1Mark
noticing nice landscape pebbles
Member since November 2004
Posts: 91
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Post by 1Mark on Oct 27, 2008 11:33:43 GMT -5
I've got a photo-tach with an attachment for measuring linear speed. Both my 3 lb. CE and my 15 lb. Thumlers run at about 45 feet per minute. I wonder if that measurement would hold up through the various models of rotaries out there...
Mark
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Post by Jack ( Yorkshire) on Oct 28, 2008 3:31:49 GMT -5
Hi All
I just put a blob of white paint on the corner of the barrel ,
Then set the tumbler off and check the rotations with my watch or stop watch setting ) !!!
Simple Cheap and acurate !! ;D
Have a good day
Jack
Yorkshire UK
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1Mark
noticing nice landscape pebbles
Member since November 2004
Posts: 91
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Post by 1Mark on Oct 28, 2008 12:26:32 GMT -5
Hi All I just put a blob of white paint on the corner of the barrel , Then set the tumbler off and check the rotations with my watch or stop watch setting ) !!! Simple Cheap and acurate !! ;D Have a good day Jack Yorkshire UK Yup, that's how I check RPM's too. The photo tach I picked up years ago for tuning radio controlled race car motors. I made the linear FPM measurement simply out of curiosity. I suspect the 45 FPM measurement will hold up across a wide spectrum of barrel sizes. Mark |
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Post by johnjsgems on Oct 28, 2008 17:57:36 GMT -5
I've had a lot of tumblers over the years and never weighed a batch. If your motor is properly sized and in good shape fill by volume (3/4 full). If your motor is weak and you are tumbling something really heavy like Rhodonite maybe use some ceramic media or other light weight filler to reduce the weight.
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1Mark
noticing nice landscape pebbles
Member since November 2004
Posts: 91
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Post by 1Mark on Nov 9, 2008 11:20:32 GMT -5
I've got a photo-tach with an attachment for measuring linear speed. Both my 3 lb. CE and my 15 lb. Thumlers run at about 45 feet per minute. I wonder if that measurement would hold up through the various models of rotaries out there... Mark Oops. I just discovered that the belt was slipping on the CE. It finally got bad enough that I noticed the barrel jerking a bit. Replaced the belt and it now runs 51 fpm and 45 rpm. This is a tad faster than when the machine was new -- I replaced the plastic OEM drive pulley with an aluminum one (from a Lortone, I think. I did the mod 4 years ago.) So the 45 fpm measurement obviously doesn't hold up. Mark |
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