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Post  god's money on Mon Sep 30, 2019 4:48 pm

Over the last few weeks I have been doing research on building a bellow dry washer. I have decided on building with Aluminium, I am undecided on screens to use, primary and riffle screen, I was wondering about using 125 micron SS mesh under the riffles instead of fabric. What motor to use and what speed the bellows should pump at. Any suggestions would be appreciated.

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Post  Nightjar on Mon Sep 30, 2019 7:48 pm

GM,
I'll get back to you as soon as I'm free.
You must use cloth under the riffles, more later.
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Post  god's money on Thu Oct 03, 2019 7:09 pm

Got a bit done the last few days, this is quite challenging as I have never seen one in the flesh! I guess I will only be wasting one sheet of marine grade alloy, and my time and trust me I have a shed full of failures so want cry.
I was pure guessing at how many riffles and how far apart to fabricate, so I hope I have it about right.
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Post  god's money on Thu Oct 03, 2019 7:10 pm

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Post  flouro on Sun Oct 06, 2019 9:05 pm

Hi GM,

Google images of dry washers or dry blowers and click on the image you want to look at and they usually go into detail of how they look from every angle ....beets going in blind as you seem to be doing

Cheers, Ron

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Post  god's money on Mon Oct 07, 2019 9:30 am

flouro wrote:Hi GM,

Google images of dry washers or dry blowers and click on the image you want to look at and they usually go into detail of how they look from every angle ....beets going in blind as you seem to be doing

Cheers, Ron
Maybe you can help me out by telling me which info is correct?

I don't have time at the minute to verify each, but here is some info I have found! And all is only in reference to puffer style drywashers!

Riffles  height vary between 19mm and 25mm not to mention the difference suggested for their angle or shape.
Then some seem to have dead air space created by covers under the cloth in front of each riffle while others like the Keene appears to have no dead air space baffle.
Riffle tray angle varies between 25mm fall in 300mm or about 19 degrees to 28 degrees
Material under riffles suggested, Cheese cloth, Hessian, Indian head material, 20% poly cotton to 50% poly cotton oh the list goes on and on. And lets leave static electricity to flat earthers.
Pre- screen sizes vary from 5mm to 10mm
Then there is Bellow pulse beats, depending on the source they vary from 90 to 250 pumps per minute.

Confused maybe, or am I just convinced the variables are so great it is likely that it all depends on type of material being processed or it simply does not matter very much as long as you get the basic principle right?

It's fun being in the shed having a go and I am not shy of failure.

I will post some more pics soon.

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Post  Nightjar on Mon Oct 07, 2019 10:17 am

Morning GM,
An old post a engine driven dry blower with a few hints.

http://golddetecting.forumotion.net/t745-dry-blowers-for-gold-recovery?highlight=dry+blower



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Post  Nightjar on Mon Oct 07, 2019 10:41 am

Paid a few $$'s at a wreckers for an old model windscreen motor.
Couple more dollars for a Op Shop skate board, removed the wheels, hack sawed the aluminium housing away from steel wheel shaft.
Flat bar cut to length to give you the amount of stroke required.
Works a treat.




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Post  Nightjar on Mon Oct 07, 2019 10:54 am

This is the under side of riffle box from engine driven dryblower I built, same principal for riffle box.
Trying to find 12V riffle box pics. Basically steel mesh under (eg: Fly wire used here) under riffle cloth.

Dry Washer Riffle10
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Post  god's money on Mon Oct 07, 2019 12:07 pm

Nihgtjar in the pic above are the smaller round hole on the up hill side of the riffles.

I like the idea of the cam wheels on the motor. I have seen that principle and I think that's what I will do with a variation that lessens the leverage, when I have done it I will post some pics as it is difficult to explain in writing.

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Post  Nightjar on Mon Oct 07, 2019 7:16 pm

GM, The above riffle box is facing down so the holes are on the down side of the riffles. They were there to stir up the fines that was spilling over the riffles. To be honest I don't believe they helped separation.
When you cut out the swing base be sure to make the inlet holes large enough so all the air is sucked in through them and not drawing air through your cloth which will also suck fines with it into this chamber.
Using flaps of insertion rubber are ideal for sealing inlet on the up/puff stroke.
Am not sure what you mean by lessening leverage?



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Post  Nightjar on Mon Oct 07, 2019 7:30 pm

My little 12V dryblower.

Dry Washer Dryblo13

Dry Washer Dryblo11

Dry Washer Dryblo12





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Post  god's money on Wed Oct 16, 2019 3:39 pm

I have finally finished all I need is some dirt to try it out, I don't think our local red desert sand is really the stuff to try it out on.
I changed my mind on this job more than any other, I finally went for wheels on the cam. and I settled on calico for the riffle tray. Calico in Australia is the same as what they call muslin in the USA. scratch
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Post  god's money on Wed Oct 16, 2019 3:41 pm

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Post  god's money on Wed Oct 16, 2019 3:43 pm


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Post  moredeep on Wed Oct 16, 2019 6:57 pm

What a great looking rig god'smoney,can't wait to see some gold from it.
Plus love the funky beat it puts out,hopefully you'll put some lyrics to it:lol:  
good luck & thanks for sharing.

cheers  moredeep


Last edited by moredeep on Wed Oct 16, 2019 8:45 pm; edited 1 time in total
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Post  geof_junk on Wed Oct 16, 2019 7:50 pm

What a great post/photos/construction/workmanship and advice given. There should be more posts like this one. I give it 110% for enjoyment I got.
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Post  bicter on Thu Oct 17, 2019 10:37 am

Love the design, well thought out.
One question, do you use an inlet valve for the bellows?
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Post  god's money on Thu Oct 17, 2019 3:05 pm

bicter wrote:Love the design, well thought out.
One question, do you use an inlet valve for the bellows?

In the bottom plate there are four holes 55mm with rubber flaps covering them on the inside.
also note I have riffle supports covered with the same rubber used to seal the riffle tray. the rubber extends forward 5mm past each riffle to provide dead air space.
Dry Washer Bellow10
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Last edited by god's money on Fri Oct 18, 2019 9:16 am; edited 1 time in total

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Post  bicter on Thu Oct 17, 2019 6:35 pm

Thanks, a picture is worth a thousand words Very Happy
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Post  god's money on Sun Oct 27, 2019 8:10 pm

Went off today for a few hours and put about 2 wheelbarrows tailings through the dryblower, not real happy with the motor setup its just a little under powered I think and a tad slow I think, worked pretty good manually but do need to make it a little more ergonomic. I also think the pre-screen is just a little too large as I was also having trouble with the flow onto the riffle tray. But guess what I think I got my first gold specks.
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Post  Nightjar on Sun Oct 27, 2019 11:18 pm

Gm, Just watched your video again and yes you're only getting about 60 puffs/minute, bit slow.
Most older windscreen wiper motors have two speed, the one I use about 100 puffs/minute.

Congrats on your first gold.




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