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Thread: Trommel Building Supplies

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  1. #1

    Apr 2015
    Arizona
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    2 times
    Prospecting

    Trommel Building Supplies

    Hello everyone...looking into starting my trommel build this summer...Does anyone know a good place or website to purchase chain sprockets, support wheels, or the actual trommel barrel from? I've been looking around but haven't been able to find these supplies yet. Thanks

  2. #2
    us
    Aug 2004
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    Quote Originally Posted by Mooch3597 View Post
    Hello everyone...looking into starting my trommel build this summer...Does anyone know a good place or website to purchase chain sprockets, support wheels, or the actual trommel barrel from? I've been looking around but haven't been able to find these supplies yet. Thanks
    If the local hardware store doesnt have the wheels, sprockets, chain and fasteners then you can try www.grainger.com or www.mcmaster.com or even www.ebay.com

    The trommel barrel may be a bit harder to find as a unit because that would probably need to be fabricated to order, any local welding shop could do this. You could research other trommel manufacturers and try to buy just a barrel.
    russau and 1637 like this.

  3. #3
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
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    I do a lot of fabrication, and the best thing to do is to learn CAD (computer aided drafting). There are several free platforms. Once you can do that, you can draw up your trommel and figure out the dimensions for the wheels, barrel, etc. Once you know what you need, it's fairly easy to locate sellers, or fabricators in the event you need custom parts made. The benefit of CAD is you can see the outcome, and find interferences that you didn't imagine, thus saving on parts that end up not being useful.
    Jim
    Last edited by Jim in Idaho; Jun 10, 2018 at 08:35 PM.
    Clay Diggins and russau like this.

  4. #4
    Charter Member
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    Look at the Historical Gold Mining photo albums on my page

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    Or if you're building a smaller trommel, a couple of standard home water heater tanks welded together can be made into a nice size barrel, then just mount the punch plate or woven wire over the last 12" or so.

  5. #5

    Apr 2015
    Arizona
    7
    2 times
    Prospecting
    CAD is a great tool especially with specifying dimensions. I have a CAD model of the trommel I would like to build. Itís a 2ft diameter trommel driven by a small gas engine with a 6:1 gear reduction. I have the drive chain going around the entire barrelís circumference... Iím thinking I might have to custom order a 2ft diameter sprocket? Iíve heard of some just resting the barrel to drive roller, but I would think this might not be ideal for a small testing trommel?

  6. #6
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
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    I'd bet that sprocket will be really spendy. What tools do you have available to you? That's a big factor in an economic build of your trommel. Knowing that, I might have some suggestions.
    Jim

  7. #7

    Apr 2015
    Arizona
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    2 times
    Prospecting
    I'm thinking it's going to be speedy too...I have plenty of tools for metal working...The only thing I'm not able to do is bend very thick metal. Any other designs ideas/suggestions to avoid this problem?
    Jim in Idaho likes this.

  8. #8
    us
    May 2011
    tujunga ca
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    maybe look for some old junk motorcycle chains and sprockets.also look in the scrap pile at the metal place.
    sound fun, brad
    Last edited by 1637; Jun 11, 2018 at 11:41 PM.

  9. #9
    us
    Jan 2018
    Hudson co
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    All Types Of Treasure Hunting
    It may take longer and be more work, but anything thick that needs bent can always be cut and welded. Make sure that you account for where all your rock is going to go and make it as easy as possible for clean up. I would suggest building your own barrel, eaither find some pipe, or something to repurpose, like an old propane tank (just don't blow it up cutting into it). Once you have it the size you want just cut out sections where you want your screens to be, then just weld your screens over the holes, punch plate would be best. Then in the scrubber section weld in a couple agitators and your good to go. As far as a direct chain driven barrel, as stated above the sprocket will be very expensive. You might have better luck finding someone with a CNC plasma cutter than can cut you one out of a sheet of steel. The right person would do it cheaper than you can buy one and hopefully you could get the steel from somewhere cheap, possibly used. Or you could scrounge around to try to find one used off of something like an old cement mixer. Many parts are expensive new, but with some searching and a little extra work, you can turn old scrap into your new trommel for pretty cheap.
    1637 and N-Lionberger like this.

  10. #10
    Charter Member
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    Jul 2012
    Blackfoot, Idaho
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    Quote Originally Posted by Mooch3597 View Post
    I'm thinking it's going to be speedy too...I have plenty of tools for metal working...The only thing I'm not able to do is bend very thick metal. Any other designs ideas/suggestions to avoid this problem?
    Mooch, you might consider making the sprocket yourself. You could make it in sections. because of the slow speed, it doesn't need to be made perfectly. If you can find a tooth profile on the 'net, you could draw it into your CAD program and make a printed copy of the sprocket you could apply to a sheet of steel or aluminum. Another way to make the drive for your trommel is using automotive serpentine belts. I've used one for years on my Southbend Heavy 10 lathe. They have lots of traction, and you can get by with smooth pulleys rather than having to make sprockets.
    Jim
    N-Lionberger likes this.

  11. #11

    Dec 2015
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    5 times
    All Types Of Treasure Hunting
    the answer I have come up with is on the overs end of the barrel bring the ribs out and into the center where a small shaft and the final gear are placed to turn the barrel. the barrel rests on rollers that hold it in position and the feed hopper goes into the smaller end. the ribs come out beyond and then meet in the center so larger roicks have room to fall out between them. if I build one I plan to use a 4 by 6 foot expanded steel mesh rolled so it is a tube 4 foot long and most of a 55 gallon barrel is toward feed end. the people on this forum have convinced me you don't need all that screen area that tumbling ion the solid barrel section breaks up the gravel and mud and then the fines can go into a sluice from an area smaller than the whole barrel length.

  12. #12
    Charter Member
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    Another option which I am leaning towards on my trommel build is to power the rollers.
    Jim in Idaho likes this.

  13. #13
    Charter Member
    us
    Jul 2012
    Blackfoot, Idaho
    White's GMT, DFX, Coinmaster, TDI-SL, old Garrett Masterhunter BFO 'Way Too Cool' dual 18 Watt UV light
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    Quote Originally Posted by N-Lionberger View Post
    Another option which I am leaning towards on my trommel build is to power the rollers.
    I think that's the best option. Maybe spring-load one roller on each end to allow for some runout in the barrel, but still give firm contact for traction.
    Jim
    N-Lionberger likes this.

  14. #14
    us
    Dec 2016
    Colorado
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    33 times
    Prospecting
    Quote Originally Posted by Mooch3597 View Post
    I’m thinking I might have to custom order a 2ft diameter sprocket?
    Sounds like something from a laser cutter or maybe water jet. It shouldn't be terribly expensive. While they are cutting 1 have them cut 2 so you have a spare if you are worried about uptime/ production.

    McMaster Carr does list an 18" OD sprocket for $175

    You might get lucky at an industrial salvage place but using odd ball parts from a place like that can lead to a cluster down the road.

    I've worked on enough industrial junk to realize if you can find the parts on the shelf somewhere like McMaster Carr or they are a standard bearing on the shelf at the bearing house/ parts store you are better off in the long run.

  15. #15

    Apr 2015
    Arizona
    7
    2 times
    Prospecting
    Where on McMaster Carr do you see an 18" OD sprocket? I only saw 14" OD

 

 
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