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  • #16
    Originally posted by kcstott View Post
    You need a gear box or something because a direct drive chain or belt would be one heck of a large driven gear. if you can get the motor to run @2000 rpm under load then a 10:1 ratio would be 200 rpm I'd say thats a wee bit fast. I would guess about 100 to 150 rpm would be fine.
    here's the formula
    RPM of motor / desired RPM of tumbler = ratio between drive and driven unit.
    2000/150=13.3333...
    So if you have a 3" gear on the motor you would need a gear 13.333 times larger on the tumbler or about 40" This is why I say a gear box. Worm drives start at 10:1 and go up from there.
    Could he take the "final drive ratio" into consideration? If it is a 12 inch drum and it is sitting on 4 inch drive rollers [just to start someplace], then it would appear as though he has 3:1 there. Assuming the overall ratio would need to be 13.333:1 - or greater, then a 5:1 ratio between the motor and the drive roller would seem to get about 15:1 overall. And the 5:1 at the motor might be easier to come by - larger motor pully and smaller driven pully than the 13:1 would require.

    Or am I missing a salient point?

    Arvid
    Last edited by arvidj; 04-13-2008, 07:35 AM.

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    • #17
      Could you use the drum itself as the driven pulley?
      Tim Beeker,
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      • #18
        If you try to turn an unbalanced drum at 150-200 rpm, it better be nailed down real good. I'd expect the media and parts to cling to the outside walls due to outward forces. Not much cleaning action that way.
        Nick
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        • #19
          yes you could use the drum as part of the gearing you know with a belt drive or just dead weight on rollers and yes the difference between the drum and rollers would be your final drive ratio.


          Monte
          150 to 200 rpm is slow it's about as fast as a home clothes dryer. Granted the slower the better in terms of safety but you still want the parts and medial to roll up the wall of the drum and fall over on itself better yet get a VFD and a three phase motor then just dial in the frequency you desire to get the correct speed.
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          • #20
            Originally posted by kcstott View Post
            yes you could use the drum as part of the gearing you know with a belt drive or just dead weight on rollers and yes the difference between the drum and rollers would be your final drive ratio.


            Monte
            150 to 200 rpm is slow it's about as fast as a home clothes dryer. Granted the slower the better in terms of safety but you still want the parts and medial to roll up the wall of the drum and fall over on itself better yet get a VFD and a three phase motor then just dial in the frequency you desire to get the correct speed.
            I don't know what kind of dryer you have but mine travels at 48 rpm. Now if I
            increase the speed times 3-4 times, the clothes would be stuck to the drum walls.
            Nick
            Miller 252 Mig
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            Vist my site: www.nixstuff.com
            and check out some of my ironwork and other stuff

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            • #21
              We made a chain gear driven 24"*36" tumbler for doing angle and flat stock, , the inside had 4 horizontal plates about 3" high the whole width. Gear reduction box gave us a speed of about 60 rpm. The best media I found was slugs from the ironworker, granite and grindstones just did not last more than a few hours and did not works anywhere as well. 5 hours compared to 30 min....Now as far as the noise, you could hear that baby 2 blocks away in an industrial area!!!!!!
              I would line with floor mats screwed to the inside. We often loaded 300 to 500 lbs in that baby, sure made deburring nice. Hope this helps, Paul
              More Spark Today Pleasesigpic

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              • #22
                I have built a few peanut roasters . . . .

                I have built a few commercial peanut roasters, which are basically tumblers with burners underneath. You can avoid the expense of a gear box by using a double reduction. ie . . . motor pulley 1.5" to a 14" pulley on a set of bosses, that shaft has a 1.5" pulley to a second 14" pulley attached to your drum, coming off a standard 120 vac motor turning 1750 rpm would yield 20 rpm on your drum. Adjust pulley sizes as needed. You can buy aluminum cast pulleys at Grainger fairly cheap. In my later nut roasters I used a gear motor. They were nice, but very expensive. Since you really have no space constraints or OSHA requirements to meet, this is the way I would go.

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