Aussie Lapidary Forum

Fossicking and Rockhounding => Tips, Gadgets & Brag Board. => Topic started by: Jimnyjerry on April 22, 2016, 04:30:41 PM

Title: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 22, 2016, 04:30:41 PM
The metal mark II version of my throw screen is sitting in the shed sulking.

Finally put a new screen together for FN Qld and the sapphire fields.


(http://aussielapidaryforum.com/forum/gallery/8/medium_9-210416170116.jpeg) (http://aussielapidaryforum.com/forum/index.php?action=gallery;sa=view;id=8069)
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jamo on April 22, 2016, 09:25:56 PM
Jerry (or others), do you reckon something like this might work ok 'in stream' to speed up processing gravel?
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Lapis Lupinus on April 22, 2016, 10:50:13 PM
Yeah, good question Jamo. I'd like to know too
Title: Re: New throw screen for 2016 season fianlly finished
Post by: nuggethill on April 22, 2016, 11:28:34 PM
Have you tried to load it up Jerry,
the only way to test it is to try it in
a creek and see if it does the job
I also would be interested to know how well it works
regards Harry
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 23, 2016, 09:28:56 AM
Jerry (or others), do you reckon something like this might work ok 'in stream' to speed up processing gravel?

Not really would clag up with wet gravel.

Only work in a stream if it was changed and set up horizontal and below water level. Really looking at a table with two or more removable sieves with at least a 4 inch gap between them all set up below water level.
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Findem on April 23, 2016, 01:39:36 PM
In most creeks it's the sand you want to remove to get at the gems. The gravel is the easy part.
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 23, 2016, 02:55:37 PM
In most creeks it's the sand you want to remove to get at the gems. The gravel is the easy part.

True John.  :)

A throw screen only works well with dry material. Sand goes through and the nice gravels slide into the appropriate bucket for sorting or washing depending if I am chasing topaz or sapphires.  :)
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Tripz on April 24, 2016, 01:16:13 PM
Looking good Jerry, what size fine mesh did you use?
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 24, 2016, 03:37:15 PM
Tripz got a 4 mm gap between the wires for the screen by overlaying two 10 mm gap screens. Also did some wire tying.  :)

Will try to chase up a 3.5 mm gap one up Rubyvale / Sapphire / Emerald area to replace it. Just need a piece 14 inches by 33 inches to replace it if the original does not work out.
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Lefty on April 26, 2016, 12:29:42 PM
Looks good Jerry.

I've made two and their best use is definitely with dry, friable material. Mine has worked well at Lowmead (amethyst) where the ground is mostly just decomposed granite sand and also at Mount Gibson (topaz) where the ground is very rocky but the soil between the rocks is fine, powdery and ashy - both types go straight through without difficulty but if the ground is clayey it would have difficulty.
Title: Re: New throw screen for 2016 season fianlly finished
Post by: mangomick on April 26, 2016, 01:18:24 PM
Hi Jerry
Your hinges on the front legs have got me stumped. It looks like  they allow the legs to  hinge back against the screen which means you have to put the  gutter or channel for the larger rocks on later and the way the hinges look like they are hung, won't they, if you throw a large shovel full of rock and dirt at the screen, open and collapse the sieve ? Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do in which case if you are pouring it in gently it probably wouldn't collapse . .
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 26, 2016, 01:35:47 PM
The hinges on the front legs a have a catch on the back that locks them onto the frame of the screen.  ;D

I did not give away all my secrets in the photo.  ;)

 ;D
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 26, 2016, 01:39:09 PM
Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do ...
Have been known to throw gravel at the screen like a madman.  ;D

Sometimes I even miss with some of it.  :o
Title: Re: New throw screen for 2016 season fianlly finished
Post by: mangomick on April 26, 2016, 01:48:38 PM
Cheers Jerry  beers
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Tripz on April 26, 2016, 04:08:59 PM
Maybe you don't stand back and shovel your wash like a madman into the throw up sieve from a  distance like I do ...
Have been known to throw gravel at the screen like a madman.  ;D

Sometimes I even miss with some of it.  :o

I`m lucky to get 2 out of 3 always miss ;D so had to design(er, copy from club)one that I run a full bucket through in one go. Put 4mm in bottom couldn't get 3.25 so not for sapphires. Works great everywhere else though. Forgot how to put picci in here but it is in Gallery under my little helper.
 beers
 
(http://aussielapidaryforum.com/forum/gallery/8/medium_2249-260416154231.jpeg) (http://aussielapidaryforum.com/forum/index.php?action=gallery;sa=view;id=8077)


(Edited by admin to add the photo)

Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on April 26, 2016, 04:40:11 PM
Interesting looking unit you have Tripz.  beers
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Tripz on April 26, 2016, 06:22:29 PM
Interesting looking unit you have Tripz.  beers
Thanks mate, just chuck in a bucket uptop and comes out the bottom, bloody big majo buckets are getting heavier though, mmmm maybe mark 2 coming up? Happy huntin up north, looks like we will get there in July this year, can`t wait. beers
Title: Re: New throw screen for 2016 season fianlly finished
Post by: pc bowe on January 08, 2017, 08:49:25 AM
So Jerry how did the throw screen go?
(http://aussielapidaryforum.com/forum/gallery/8/medium_9982-080117082811.jpeg) (http://aussielapidaryforum.com/forum/index.php?action=gallery;sa=view;id=8445)
Here's a Pic of our card table.
Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on January 08, 2017, 09:38:30 AM
Impressive screen you have there pc bowe.  :)

Had to change the locking mechanism for the front legs on mine as originals gave way under weight. Now OK as mark IV.  :)
Title: Re: New throw screen for 2016 season fianlly finished
Post by: pc bowe on January 08, 2017, 04:13:34 PM
The card table folds flat,can be carried under one arm and the most people we've had on it was 6 sorting and two shoveling.
The fall on all parts of it are adjustable to compensate for what ever material is going trough as
large a rock as can be picked up on the shovel just bounces off.
When it comes to material in loam the top screen gets lay flat and a bucket is worked over the material to bust it up.

Title: Re: New throw screen for 2016 season fianlly finished
Post by: Jimnyjerry on January 08, 2017, 08:49:35 PM
Impressive and lighter than mine  beers
Title: Re: New throw screen for 2016 season fianlly finished
Post by: pc bowe on January 08, 2017, 09:01:36 PM
In truth I only use it for it's social aspect and when I'm with a bunch of new chums.
I rarely dig and screen.
Preferring to spec and rake. 
Title: Re: New throw screen for 2016 season fianlly finished
Post by: pc bowe on January 08, 2017, 09:52:14 PM
On a related topic.
This reminds me of a story about one of our local old coytes.
While boiling the Billy for some visitors to his bush hut one day,it was noted that his bed consisted of two layers of boards some blankets and a pillow.
(Sandwiched in between the boards was his Sunday best,an old school bush iron.)
Upon their return visit, an old wire mess steel frame bed was presented as a gift.
Which was excepted with great enthusiasm.

Apparently they make an excellent Throw screen.