large scale dryblower

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Post  garry on Sun Jan 06, 2013 5:27 pm

hi all
in the proccess of building a large scale dryblower. the material will be fed over 1 inch shaker screen inti a hopper which in turn feeds a trommel
with half inch screen dropping onto the airbeds. the two airbeds are four feet by two feet each with inch and quarter riffle bars with one foot
spacings on stainless steel wedge wire.thinking of using geofabric for cloth. also thinking of setting up a half inch jigging action on the airbeds.
was wondering if anybody had any thoughts on airbed angle and wether the geofabric would be suitable for the cloth would apprecciate any
suggestions.

thanks garry.

garry
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Post  someday on Sun Jan 06, 2013 7:31 pm

Wish I could help mate, try Google'ing for other forums! it's a common topic if thats what your into!

My only tip would be "Don't get it wet" when in use cheers

Cheers
Chris
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Post  Nightjar on Sun Jan 06, 2013 8:47 pm

Garry.
Permanently attach two spirit levels east/west, north/south on horizontal section of your blower, level the machine and then adjust the riffle box ideal angle to 21° from horizontal.
Good luck, don't forget to post a few pics when you get it working.
As Chris mentions, dusty dry material only.

Peter
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Post  garry on Sun Jan 06, 2013 9:45 pm

hi peter
thanks for the info not a lot of info on google for large dryblowers. still have the trommel angle to work out but might make it adjustable
could be a matter of trial and error. still have to fit the blower fan and elctric motors. hope to have finished by march to take up to the
lease in the flinders ranges.will post some pictures of the dryblower and hopefully some gold.thanks again peter.

cheers garry

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Post  Nightjar on Mon Jan 07, 2013 12:24 am

Garry, If you are going to use a trommel set it at reverse angle to your riffle and include a spiral feeding the over size uphill, this will give your feed more retention time to break up clay clumps and shake the fines out of the oversize.
Don't forget to detect your oversize heaps before moving on.

Cheers
Peter
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Post  Guest on Fri Jan 11, 2013 7:10 pm

Here's a book that may help i think there is one on E-Bay. cheers

Dry washing for gold / James Klein
Klein, James, 1932-

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Post  rc62burke on Fri Jan 18, 2013 8:27 pm

Hi Garry
Good luck with your project, I too will be building a dry blower this year not large scale like yours but a big enough unit to keep 2 guy's busy.
My advice is to listen to what Nightjar is saying as he has done a fair bit from what I have learned just check out his old post's, also have a look at the American forums like "Arizona outback forum" & also "Nuggethunting forum" they do alot more dryblowing over there it would seem.
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