DIY 3 tray dry blower

[Custard]

Evening
Got to do a bit over last two days.
Had back of bellows sheet metal rolled and installed them and then installed bellows wood. Is a nice fit so not much air should escape, should be good. Installed riffle tray deck and have finished parts for riffle trays, 196 x 25mm holes (needed a beer after that) so will soon put them all together.
Also installed feed slides so ready to work out hopper.

 

[Stingray]

Great work mate, looks the part. But I can't work out what you are doing with all the holes in the riffle tray? If the wooden square sections are your riffles then there should be a dead air space on the up side of the riffle and the rest open. Mine is about 10mm but kit is a smaller dry blower. Looks like you have it around the other way with air coming through the holes and the rest dead air. Or am I reading it wrong?

 

[Custard]

Great work mate, looks the part. But I can't work out what you are doing with all the holes in the riffle tray? If the wooden square sections are your riffles then there should be a dead air space on the up side of the riffle and the rest open. Mine is about 10mm but kit is a smaller dry blower. Looks like you have it around the other way with air coming through the holes and the rest dead air. Or am I reading it wrong?

Thats for constant air. I was told 25mm holes approx 3 - 5 mm apart kissing the upside edge of your riffle.
For anyone doing it i found the best was to use a spade bit, go half way through all holes, then turn over and come from the other side. No blow outs and beats hole saw for nicer hole and no spending ages getting plugs out of bit.

also see Nightjar's comments
Post in thread 'Bellows Dry Washer Build' https://www.prospectingaustralia.com/threads/bellows-dry-washer-build.33330/post-536277

 

[Stingray]

Ok, thanks I'm not familiar with that setup, keen to see how it pans out.

FYI I use an old Gold Wizard dry blower. It's over 40 years old I guess and it has the riffle tray set up as I described. There's a photo and description of it at post 49 of the thread you mention in your reply above. There are also photos of a little manual bellows dry blower I made. It has dead air on the up-side of the riffles and also works well. I've since converted it to constant air and it still works well with the same riffle tray.

 

[Custard]

Morning,
Not much time spent in dry blower.
Rocker arm for bellows installed and working out hopper and screen.

 

[Custard]

Got a bit done on the hopper today. I estimate 0.55 m3 capacity. Will work on removable front panel tomorrow then time for the screen.

 

[Custard]

Only a little bit of time on dry blower over the last couple of days, life keeps getting in the way.
Riffle trays are done and ready for a coat of paint. Last wall on hopper. Now working out the screen.

 

[Custard]

Little bit of progress recently.
Removable hopper wall done

 

[Custard]

Screen mount

 

[Custard]

Rollers for conveyor. Bought rollers and one frame to copy.

 

[Custard]

Mount for vibrating screen assembly

 

[Custard]

 

[Custard]

Roller frames done.
Smarter to buy i reckon

 

[Custard]

Riffle trays done, working on clamps now

 

[Custard]

Shafts have been machined now working out screen vibrating

 

[Moneybox]

View attachment 13230

Nice work but I'm a bit concerned about that rubber insulator. I started out with my screen sitting on very flexible rubber mounts about 90mm high. I changed them later and inserted coil springs, same as under a trailer camper. It improved the free movement of the shaker screen allowing it to more easily vibrate.

 

[Custard]

Nice work but I'm a bit concerned about that rubber insulator. I started out with my screen sitting on very flexible rubber mounts about 90mm high. I changed them later and inserted coil springs, same as under a trailer camper. It improved the free movement of the shaker screen allowing it to more easily vibrate.

Evening Moneybox,
My ones are boat motor engine mounts. Hopefully will work out, but will certainly look into the springs as an option if all goes to sh#t with current set up.

 

[Custard]

Clamps done

 

[Custard]

Making parts for screen vibrator

 

[Custard]

Screen fabbed and ready for welding, when I get back from work.