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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.
Dry Washer Riffle10
Dry Washer Riffle12
Dry Washer Riffle11

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Post  god's money on Thu Oct 03, 2019 7:10 pm

Dry Washer Trough10
Dry Washer Trough11
Dry Washer Combot10

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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.




Dry Washer Windsc10

Dry Washer Windsc11

Dry Washer Windsc12

Dry Washer Windsc13
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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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