Trommel Build
Welcome guest, is this your first visit?
Member
Discoveries
 
Page 1 of 2 12 LastLast
Results 1 to 15 of 26
  1. #1
    us
    Jun 2009
    Springfield Missouri
    35

    Trommel Build

    A while back I had an idea about building a 3' long trommel with 4 to 5 tubes inside each other. This was meant to be a compact classification system, light weight made of aluminum. The center tube was 10in diameter and 3' long and had 1/2" holes in it. The next tube was 14" in diameter and had 3/8 holes in it. The next 2 or 3 tubes followed the same idea with the holes getting smaller. I was going to take material out of each tube and run it through a sluice box. I believed in classification was the key to good recovery percentages. I thought each sluice box could be tailored for a certain size of material. A grizzly at the start of the 9" tube would filter out anything larger than 1".

    My trommel idea is not going well. I have some friends in the design department at the college. We built a computer model of what my plan was. Plan was to run the rocks down the tube and anything smaller than 1/2 inch fall through to the next tubes and so on. Rocks 1 inch to 1/2 inch plus went on out the center tube. This was all straight forward like trommel designs I saw on the web.

    Problem: When the rocks smaller than 1/2 in fell through, most of them were over half way down the center tube. This only gave about half the second tube to sort for the next one. By the third tube almost all the material was exiting with out any further sort. I lost most of the 3 foot distance I wanted the material to travel for a good sort. I varied the speed of rotation and tilt angle with no success. Capacity was not a goal, but I wanted a complete sort (classification). We kicked around a lot of ideas on how to make sure each tube sorted the material for the entire 3 foot. I (we) started looking at a reverse helix that I saw on the web. If we used the helix in every other tube, we could bring the material back up and over the entire tube length. I still like the idea of a compact classification system and not stretching the tubes end over end for 20 feet. This is the current direction that holds the most promise at this time.

    Another problem I have is I have no first hand experience at classifying rock. I need to see the terrain really get out and visit with people prospecting, mainly get my hands dirty. All the books and computer models don’t replace that.

    If anyone has any comments or suggestions they are welcome. This summer I plan some road trips to some claims and get some first hand experience. At the end of the summer I plan to sort through all the ideas and models and maybe get a working prototype.

    If this idea ever works, the idea is freely available to anyone who wants to build one. All the research is public.

  2. #2
    jog
    jog is offline
    us
    jog

    Nov 2008
    Tillamook Oregon
    Whites MXT / GMT
    1,364
    677 times
    All Types Of Treasure Hunting

    Re: Trommel Build

    rwells
    What were you using for screen, and did you have anything in the tubes to help flip the material in the tube?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_1831.JPG 
Views:	4656 
Size:	74.0 KB 
ID:	508702  
    Those Who Say It Can't Be Done Shouldn't Interupt Those That Are Doing It.

  3. #3
    us
    Feb 2011
    59
    1 times

    Re: Trommel Build

    Hi I get my 12 X 36 inch,1/2 inch screen, 3 foot trommel barrel last week.I had the same ideal,but with a 1/2 then a 1/4 inch barrel.I was going to off set the second hopper under the fist trommel bucket chute.When I measure it in height it was around 4 to 4 1/2 foot high.Thats hard to shovel.Having 1/2 inch screen is because I don't want to miss a half inch nugget.Now I have to classify to 1/4 inch right or can I run half inch rock down a sluice?

  4. #4
    us
    Jun 2009
    Springfield Missouri
    35

    Re: Trommel Build

    Jog
    Thanks for the comment. We put 2 of these "diverters" in the model. I consider them necessary or the material can sit in there and just slide as the barrel turns.

    Rick

  5. #5
    us
    Jun 2009
    Springfield Missouri
    35

    Re: Trommel Build

    My understanding is the sluice riffles and design is set for the size of material your running. Guess you could run 2" rocks through if the water flow and riffle height was right. Your way ahead of me however, I still need to get my feet wet this summer. Sounds like you have a nice machine. Does your machine sit 4 feet above the ground. I was making the frame as low as I could to keep it down.

    Rick

  6. #6
    us
    Jun 2009
    Springfield Missouri
    35

    Re: Trommel Build

    Sorry forgot to answer about the screen. Using aluminum 1/8 thick, expanded metal design. More like diamond shapes. The round puch plate type stuff was too expensive.

    Rick

  7. #7
    us
    Feb 2011
    59
    1 times

    Re: Trommel Build

    Hi I'm just getting started building it.I have the round pinch.I will post pic's soon.

  8. #8
    us
    Feb 2010
    Black Hills, South Dakota
    856
    839 times
    All Types Of Treasure Hunting

    Re: Trommel Build

    Hi Rick & Jag,

    To answer you clasifying question Jag, You can sluice 1/2 " rock in most sluices. I have a Keene A52 and have run 1/2 " through it many times. I usually run 1/4" though as the gold here is pretty small. Larger rocks can bounce the small gold right out of the sluice. Rick, I'm finally going to get to run some material through my new drywasher. Had beautiful weather and the snow in gone, except in the mountains. My partner says there is still about a foot up there yet but going fast.
    Good luck with your tommels guys.

    B H Prospector

  9. #9
    jog
    jog is offline
    us
    jog

    Nov 2008
    Tillamook Oregon
    Whites MXT / GMT
    1,364
    677 times
    All Types Of Treasure Hunting

    Re: Trommel Build

    Quote Originally Posted by rwells
    My understanding is the sluice riffles and design is set for the size of material your running. Guess you could run 2" rocks through if the water flow and riffle height was right. Your way ahead of me however, I still need to get my feet wet this summer. Sounds like you have a nice machine. Does your machine sit 4 feet above the ground. I was making the frame as low as I could to keep it down.

    Rick
    Not sure if this was meant for me or not but the trommel I built is just under 40" from the top of the hopper down to the ground.
    Those Who Say It Can't Be Done Shouldn't Interupt Those That Are Doing It.

  10. #10
    jog
    jog is offline
    us
    jog

    Nov 2008
    Tillamook Oregon
    Whites MXT / GMT
    1,364
    677 times
    All Types Of Treasure Hunting

    Re: Trommel Build

    rwells
    Do you have any pics of the prototype screen that you built?
    Those Who Say It Can't Be Done Shouldn't Interupt Those That Are Doing It.

  11. #11
    us
    Feb 2011
    59
    1 times

    Re: Trommel Build

    Hi Rwells where did you get the spocket for a 12 inch barrel,I'm having problems finding one

  12. #12
    jog
    jog is offline
    us
    jog

    Nov 2008
    Tillamook Oregon
    Whites MXT / GMT
    1,364
    677 times
    All Types Of Treasure Hunting

    Re: Trommel Build

    Quote Originally Posted by jaguargene
    Hi Rwells where did you get the spocket for a 12 inch barrel,I'm having problems finding one
    jaguargene
    Hope rwells doesn't mind me awnsering your question. I found a sprocket at www.surpluscenter.com for my 12" trommel build.
    The part # is 1-1980-72 that is a 50 pitch sprocket and the outside diameter is 14.69". I had to cut the center out to the size I needed.
    Those Who Say It Can't Be Done Shouldn't Interupt Those That Are Doing It.

  13. #13
    us
    Gold Dredger 2nd Generation

    Dec 2010
    N. Cal - Born & Raised
    426
    64 times
    Prospecting

    Re: Trommel Build

    Yeah, Jog, I really like the Burden Surplus Center but always shop around, sometimes their prices can be higher, mostly their not.

    jaguargene, you can get the part # of the sprocket you need off the G&G Manufaturing site and then order from any industrial supply, shop around for the best price.
    They do make larger if your in need of one upto 112 Tooth #50.

    http://www.ggmfg.com/products.aspx

  14. #14
    us
    Jun 2009
    Springfield Missouri
    35

    Re: Trommel Build

    That wasn't me with the sprocket. I plan to use a belt around the trommel. In a pipe dream I thought about building a water motor to power the unit. Maybe use the spray water to power the unit and then rinse the gravel.

    Rick

  15. #15
    us
    Jun 2009
    Springfield Missouri
    35

    Re: Trommel Build

    Jog
    No pics yet. My 1/2" screen is still getting rolled. A lot of my info comes from the computer model. Still practicing the TIG welding for aluminum. By the way I'd be happy to weld anything you guys need. Only problem is getting it to me and back. Welding is free. Information is priceless. I'll get some pics up soon. Only have the center tube, not the frame done.

    Rick

    Just added pics 6-1-11
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	All 4 tubes togather sm.jpg 
Views:	6594 
Size:	248.8 KB 
ID:	53112   Click image for larger version. 

Name:	All 4 tubes togather sm.jpg 
Views:	1521 
Size:	248.8 KB 
ID:	535204  
    Attached Images Attached Images   

 

 
Page 1 of 2 12 LastLast

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Search tags for this page

build your own trommel
,
building a gold trommel
,
gold trommel angle
,

gold trommel design

,
gold trommel plans
,
how does a gold trommel work
,

reverse helix trommel plans

,
trommel barrel
,
trommel plans
,
trommel tubing
Click on a term to search for related topics.
Powered by vBadvanced CMPS v4.3.0