billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Oct 29, 2014 13:16:29 GMT -5
My big question is about the shafts and pulleys. I understand the pulley ratio but am worried about the shaft size. Is 5/8" the standard size? The pulley for the motor has me confused. 1/2" or 5/8". I was wondering if you loaded up the top level with four 6# barrels, would the shafts bow a bit? I started thinking about more support.
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Deleted
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Post by Deleted on Oct 29, 2014 14:43:18 GMT -5
Ann how many horses are in that motor? 1/4?
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Oct 29, 2014 15:07:40 GMT -5
How many pounds can a 1/4hp motor handle? A 1/3hp? I'm looking at around 40 pounds worth of barrels.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Oct 29, 2014 15:22:54 GMT -5
How many pounds can a 1/4hp motor handle? A 1/3hp? I'm looking at around 40 pounds worth of barrels. This has a 1/3 HP motor and turns 90-100 pounds on the fast side w/out getting hot Bill. I have a 1/6 HP motor that turns a 40 pound barrel at 24 RPM. 1/6 is 1000 RPM motor, and 1/3 is 1725
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Oct 29, 2014 15:42:30 GMT -5
Thanks James, The gathering of information may be the toughest part of the project. I don't want to start buying things that won't work.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,154
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Post by jamesp on Oct 29, 2014 16:14:56 GMT -5
Thanks James, The gathering of information may be the toughest part of the project. I don't want to start buying things that won't work. Tumbler is so simple. I have a photo of the other tumbler. It was real easy. One inch shafts, over kill.
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Oct 29, 2014 16:25:58 GMT -5
I'm thinking about my lower tier running the four 6 pound barrels with the top tier running the three 3 pound and three 1.5 pound barrels. Guess its all about lining up pulleys.
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Post by fantastic5 on Oct 30, 2014 19:49:40 GMT -5
My big question is about the shafts and pulleys. I understand the pulley ratio but am worried about the shaft size. Is 5/8" the standard size? The pulley for the motor has me confused. 1/2" or 5/8". I was wondering if you loaded up the top level with four 6# barrels, would the shafts bow a bit? I started thinking about more support. I can't tell you if 4 fully loaded barrels would bow the shaft or not, I only have the two 6# barrels and it doesn't seem to affect it at all. If I had a wider span between the pillow blocks I certainly would have gone up to 3/4" shafts, but I am betting on this being okay. But I really didn't have any thing to base my assumptions on. If you need me to, I can put 12 additional pounds of rocks in a container and see if it bows the rods. My motor has a 1/2" shaft and it is a 1 1/2 inch pulley. The next pulley on the lower shaft is a 5". Hope this answers your questions.
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Post by fantastic5 on Oct 30, 2014 19:56:01 GMT -5
Ann how many horses are in that motor? 1/4? The motor I went with is a 1/6th hp 1725 old GE motor. My friend had me take home a dual shaft 1/3 hp 1725 motor too. Not sure what I will do with that motor yet. I guess I'll hold on to it incase this motor quits working or it starts getting hot due to load. Right now it is just fine, barely warm, but I am only running about 15#s.
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Deleted
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Post by Deleted on Oct 30, 2014 20:51:54 GMT -5
Ann, is it already running? Need a video!!
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Nov 3, 2014 13:05:41 GMT -5
Last evening I built the base of my two story tumbler. I'll start ordering the hardware this week. I'll be going with the 5/8 rollers and pillow blocks. I'll be checking Amazon and Ebay. Is Home Depot worth checking?
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Post by fantastic5 on Nov 3, 2014 13:26:34 GMT -5
Last evening I built the base of my two story tumbler. I'll start ordering the hardware this week. I'll be going with the 5/8 rollers and pillow blocks. I'll be checking Amazon and Ebay. Is Home Depot worth checking? Several people recommended this site for everything from the motor to the pillow blocks. Surplus Center But being bullheaded I went my own way and found cheaper on eBay, and yes, cheaper cost = cheaper materials. And if I remember Lowes was cheaper on the steel rods than Amazon, but I was able to find a steel outlet store locally.
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Nov 3, 2014 13:40:25 GMT -5
I like shopping local. I hate waiting for things to show up after buying online.
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Nov 10, 2014 16:38:01 GMT -5
The pillow block bearings showed up Friday. Placed the cut garden hose on the rollers. Now on to buying belts and pulleys.
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Nov 12, 2014 17:25:23 GMT -5
OK, I believe that I'm starting to over think this tumbler project. I have the 5/8" (x36") steel rods and 5/8" bore pillow bearings. I even have the garden hose cut and placed on the rods. Base done.
I've searched the archive enough to confuse myself. I'm ready to buy the motor. But the thing that's killing me is the pulleys. In the picture, is that a 1.5" pulley on the motor? And the pulley on the drive "shaft or rod" a 10 inch 5/8" bore? I'm spending too much time on the computer and not enough with the tumbler.
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Deleted
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Post by Deleted on Nov 12, 2014 17:49:20 GMT -5
Rockoonz - jamesp or anyone else, can you offer up a pulley calculator bill - dont forget in the pulley calculations the driven rods and the barrel counts too.
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Post by Drummond Island Rocks on Nov 12, 2014 18:51:32 GMT -5
Rockoonz - jamesp or anyone else, can you offer up a pulley calculator bill - dont forget in the pulley calculations the driven rods and the barrel counts too. I made a custom excel document that figures out the final barrel RPMS by typing in your motor RPM, your pulley diameters, your shaft diameters and your barrel diameters. PM me if you need a copy Chuck
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Deleted
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Member since January 1970
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Post by Deleted on Nov 12, 2014 20:28:03 GMT -5
that is awesome chuck!
i may hit you up for that when i start my project!
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billg22
spending too much on rocks
Member since November 2011
Posts: 451
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Post by billg22 on Nov 13, 2014 12:52:16 GMT -5
By looking at the chart, with the 1.5" motor pulley and 10", my 6 pound barrel should turn around 25 rpm. Right? My top story of the tumbler will be running three pound barrels. If I put a 2" pulley on the drive roller on the lower level and a 3" pulley on the upper level drive roller, the 3 pound barrel should slower than 50 rpm. Right? My brain hurts.
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Post by fantastic5 on Nov 13, 2014 15:39:26 GMT -5
I am running my tumbler FAST. I can always change my pulley sizes to slow things down, but I wanted to push the envelope and see what happens. I have a 1 1/2" pully on the 1/6 th hp motor (it's drive shaft is 1/2"). It goes to a 5" pully on the lower shelf. Math looks like this:
1725 RPM X 1.5/5 X .625/6 = 54 RPM That is with 1.5" motor pulley, 5" pulley, 5/8 inch shaft and 6" PVC barrel
This then runs up to my top level by way of a 2" pulley on the bottom 5/8" rod to the 2/5" pulley on the top 5/8" rod.
323 RPM x 2/2.5 x .625/8" (6# barrel) = 20 RPM
323 RPM x 2/2.5 x .628/4" (3# barrel)= 40 RPM
Now that is the math, but when I actually count the RPM's of the 6# barrel it is running closer to 25. It has done a great job rounding agates and I have finished the first batch and moved it into the vibe. The coral is MUCH slower and really chewing through the grit. I have enough grit to re-charge tonight, then I am out until a shipment comes in.
I actually haven't run anything on the lower shelf as I haven't yet constructed the PVC barrels. I didn't see a reason to do that until I have bulk grit.
Hope this helps.
Ann
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