ChrisNZ Posted November 24, 2010 Posted November 24, 2010 Looking at my designs for a ball mill I'm now wondering what would be the ideal 'seating' of a drum on the mill. Blue dots are the rollers, and the larger circles being the drums. I'm thinking I'll make the non-driven roller adjustable to accomodate larger drums, but how should a drum sit on the rollers? I'm guessing something like #2 perhaps a point between #2 and #3. Looking for advice from people that've made, or who have ball mills. Cheers!
mike_au Posted November 24, 2010 Posted November 24, 2010 The short answer is: it doesn't matter. The spacing doesn't impact on the gear ratios and so it won't affect how the mill works. Having said that, if you put the rollers stupidly close together (I don't think diagram 1 would do it, they would almost need to be touching) then there is a chance your drum might fall off, if you put them too far apart then you can't use a smaller drum in the future. I would probably go for something like 2, but if you have a reason to go with 1 or 3 then they are fine too.
Bonny Posted November 24, 2010 Posted November 24, 2010 Looking at my designs for a ball mill I'm now wondering what would be the ideal 'seating' of a drum on the mill. Blue dots are the rollers, and the larger circles being the drums. I'm thinking I'll make the non-driven roller adjustable to accomodate larger drums, but how should a drum sit on the rollers? I'm guessing something like #2 perhaps a point between #2 and #3. Looking for advice from people that've made, or who have ball mills. Cheers! If you are going to make the idle roller adjustable, then you should be able to set the drum in all 3 positions... or close anyway. You might find the jar slips in one position and works fine in another.My ball mill probably looks closest to #2.
pyrogeorge Posted November 24, 2010 Posted November 24, 2010 Don't use the #3 because my opinion is that the drum will slips with the rollers and it can't make full rotation..My ball mill has the #1 idea.. http://img25.imageshack.us/img25/4537/dsc02425s.jpg http://img37.imageshack.us/img37/5690/dsc02427k.jpg
AdmiralDonSnider Posted November 24, 2010 Posted November 24, 2010 Don't use the #3 because my opinion is that the drum will slips with the rollers and it can't make full rotation..My ball mill has the #1 idea.. I´d second the idea of not using #3. It´s certainly the worst option. You can try turning it by hand- it will be harder than when using #1 or #2. I figure the point of gravity there is needlessly low.
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