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#51

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,624
Member
21 March 2020 11:24 am

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Happy Hunting, Nightjar.

2 users like this post: Dave63, goody2shoes

#52

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,624
Member
21 March 2020 11:43 am

Built this motor driven one years ago, most of the steel work, pulleys and shafts from scrap metal dealer. all up about $500, biggest expense was the brand new motor.
Paid for itself over and over, however when the GPX-4500 came along and my old bones were beginning to creak, sold it for $2,800.00. The fella who bought it was over the moon, think he would have paid twice that much. It was a win, win he was happy and so was I. thumbsup

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Last edited by Nightjar (21 March 2020 11:44 am)


Happy Hunting, Nightjar.

6 users like this post: Jaros, BigWave, Dave63, greyhound, Mackka, goody2shoes

#53

brimotimp
Newbie
Joined: 12 April 2020
Posts: 3
Newbie
12 April 2020 04:27 pm

Fascinating. Very helpful.

#54

brimotimp
Newbie
Joined: 12 April 2020
Posts: 3
Newbie
30 May 2020 04:56 pm

Hey everybody, but especially Dave and Nightjar, I am building a wooden bellows type dry blower, and I am hoping to have it finished shortly so I can take it to WA when the borders eventually reopen. My riffle tray is 830 x 300 and the bellows is the same size. What stroke should I aim for on the bellows. Dave seems to be maybe 200mm, but Nightjar's small aluminium one is perhaps half that. And what speed should I be aiming for on the 12v windscreen wiper motor. Most seem to have a maximum speed of about 75 rpm. I was going to use a lever system similar to Dave's.

Simon

#55

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,624
Member
30 May 2020 05:29 pm

No hard and fast rule for the stroke Simon. With the riffle tray set at 21° it is just a matter of getting the dry material flowing smoothly down and over the riffles. Test the recovery multiple times using match head size pieces of lead. Once you get 10/10 behind top two riffles you wil know you have the ultimate set up. Don't forget to fix the two way spirit level to make it easy to set up out in the field.


Happy Hunting, Nightjar.

#56

brimotimp
Newbie
Joined: 12 April 2020
Posts: 3
Newbie
01 June 2020 05:29 pm

Hey Nightjar, and any one else. What sort of mesh or cloth is on the green plywood board you have under your riffle tray and is this to catch the fine dirt dropping down through the riffle tray into the bellows? On my riffle tray I am using 100 micron stainless steel mesh. Should I expect dirt to get through even that?
What size mesh should I be aiming to use on my hopper? I think the 1/2" steel mesh I had in mind is going to be too big considering that most gold is going to be well below a gram. I am thinking that even 1/4" mesh would still be letting a lot of coarse material through, but would crimsafe mesh be too small.
Sorry for all the questions.
Simon

#57

Nightjar
Member
From: Waikiki, WA
Joined: 26 September 2013
Posts: 1,624
Member
01 June 2020 06:27 pm

Simon, The S/S flywire mesh under the cloth is only there to support the top cloth. There should only be a minimum amount of dust entering the bellows chamber. If you're getting a lot of fine dirt the weave of the cloth is too open.
The 1/2" mesh should be ideal for the hopper.


Happy Hunting, Nightjar.

2 users like this post: Jaros, thedigger

#58

Highway1
Member
From: Just out of Bendigo
Joined: 18 August 2013
Posts: 137
Member
08 August 2020 05:28 pm

Hi Dave,
During this coronavirus lock down I thought I might build a Bellows Dry Washer. I am impressed with your build and the comments from others such as Nightjar. I will include hand operation and a windscreen wiper motor drive of some description, that will keep me legal anywhere I would like go.
Have you taken your Dry Washer for run to see how it operates and if so do you have any comments on your build or modifications, battery life on the windcreen motor?
It would be great to hear from you. Cheers


Minelab GPZ7000 (14" coil), Walbanker, old faithful steel pan, Garrett Sluice pan, blood sweat and tears, never say die.

1 user likes this post: Jackpot

#59

Dave63
Member
Joined: 23 October 2019
Posts: 123
Member
09 August 2020 09:03 am

Havent used it yet Ground here to damp and corona keeps me from traveling west to places like Tibooburra. I will post once I give it a Puff

2 users like this post: Jackpot, goody2shoes

#60

Highway1
Member
From: Just out of Bendigo
Joined: 18 August 2013
Posts: 137
Member
09 August 2020 12:48 pm

Great Dave, thumbs up.
Cheers Max


Minelab GPZ7000 (14" coil), Walbanker, old faithful steel pan, Garrett Sluice pan, blood sweat and tears, never say die.


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