Aussie Lapidary Forum

Fossicking and Rockhounding => Tips, Gadgets & Brag Board. => Topic started by: Exswede on January 17, 2010, 12:48:52 PM

Title: Throw Screen - design ideas...
Post by: Exswede on January 17, 2010, 12:48:52 PM
Hi Guys,
I have been thinking of making myself a "throw screen' to get rid of more undersized material quickly, when working in such areas...

What I would like to ask for, is your input on, as you build yours ( or one you have seen / used ) what  "worked well for you" and also "what didn't work so well", that way I might be able to avoid those 'traps for young players' that I otherwise would be stepping into...

If you have pic's or sketches that would be great, and as I get mine done to I will share what it all became to be

Thanks in advance

Anders
Title: Re: Throw Screen - design ideas...
Post by: Bluey Zarzoff on January 18, 2010, 01:35:24 PM
The way we usually make one out here is to build a frame about 1m x 50cm out of some light c channel that you use to build sheds with.

Then use 2 different meshes., 1"on top and 1/8" on the bottom. At the bottom bit of the frame, cut a hole about 6-8" for the concentrate to come out.

Get an old bit of guttering and put it on the top of everything to help get rid of the oversize.

Put legs on each corner so the screen sits at about 45o

Then all you have to do is get a bucket of wash, invert it onto the 1" screen and rub it up and down to break up any clay clumps.


Sorry, camera not working at the moment so cannot give you a photo.
Title: Re: Throw Screen - design ideas...
Post by: Aussie Sapphire on January 19, 2010, 07:06:24 AM
Good descriptions - thanks Bluey.

If anyone has got one of these, why not take a video of it.  Enter the video competition and maybe win a PRIZE !!

cheers
Leah
Title: Re: Throw Screen - design ideas...
Post by: Bluey Zarzoff on January 19, 2010, 07:58:36 AM
There is a dvd out at the moment that was done by a couple of Dutch guys last year. It is called 'The Call of the Sapphire".

Don't know if it is available anywhere else but up here.

It shows them using a throw screen.

I will try to have a look at who is distributing the dvd today at report back.
Title: Re: Throw Screen - design ideas...
Post by: Jimnyjerry on January 19, 2010, 09:31:35 AM
Hi Anders,

Have a throw screen design I downloaded of a web page years ago.  Cannot find original site anymore.  Has sketch and pictures.
It will not email on this message system.

Will need your email address so I can attach and send you the word doc.


Jerry
Title: Re: Throw Screen - design ideas...
Post by: Aussie Sapphire on January 19, 2010, 09:41:29 AM
And/Or you can email it to us at Aussie Sapphire (info@) and I'll convert it into a compatible format and post on the gallery somewhere.

cheers Leah
Title: Re: Throw Screen - design ideas...
Post by: Exswede on January 19, 2010, 10:59:12 AM

Thanks Bluey and Jerry ( sent you a PM back ) for your input

Anders
Title: Re: Throw Screen - design ideas...
Post by: Jimnyjerry on January 19, 2010, 11:11:53 AM
Word doc now sent to Anders and Leah.  Enjoy beers
Title: Re: Throw Screen - design ideas...
Post by: Aussie Sapphire on January 20, 2010, 07:55:42 AM
Document has now been converted to a pdf file and uploaded to the Media Gallery here:

[smg id=836 type=av]

Not sure why the picture here is squashed but if you click on it, the file will DOWNLOAD for you - if you click on the "More Details" link, it will take you to the Gallery item to see a non-squashed photograph and a little more information about what is inside the file.

Only a small file (147kb) but has all the necessary info to help you build your own.

cheers
Leah
Title: Re: Throw Screen - design ideas...
Post by: Cainozoic on June 01, 2010, 02:10:00 PM
These screens look incredible, I have been looking for an alternative to rigorous hand seiving, I have found a sediment that contains about one small topaz per bucket of wash if you are lucky (Hey Queensland is just too far to go for a weekend trip). Thankyou for posting the design, my next project will be to build one. Do these work if the wash is moist or wet?

Cheers, Cain
Title: Re: Throw Screen - design ideas...
Post by: Bluey Zarzoff on June 01, 2010, 03:21:28 PM
With damp wash, you will be able to break down the large clumps by rubbing the inverted bucket up and down the large mesh on the top, but you will have trouble with the fines as they will be clinging together.
Title: Re: Throw Screen - design ideas...
Post by: Stix on June 01, 2010, 07:02:21 PM
I'm still undecided as to what sort of throw screen to use, thinking of a big shaker box instead.
Title: Re: Throw Screen - design ideas...
Post by: snappa on June 01, 2010, 09:47:34 PM
hi

here is a pic of my throw down


Title: Re: Throw Screen - design ideas...
Post by: Cainozoic on June 01, 2010, 10:20:48 PM
I love the signage! So what do shaker box's look like? Are they better for more consolidated material? I'd like something that I could use for wet sediment as well, such as a granitic sand when I'm digging for smokey quartz. At the moment I just shovel through and occasionally seive. Maybe that is why I have found so little topaz?

 :-\,

Cheers Cain
Title: Re: Throw Screen - design ideas...
Post by: Exswede on June 05, 2010, 02:12:34 PM

Thanks Snappa, that looks sturdy and good... For myself  haven't made much headway, maybe this cold weather will allow me to avoid a few other things and I can get stuck into this instead :-D

Anders
Title: Re: Throw Screen - design ideas...
Post by: dinrocks on August 16, 2010, 01:22:52 PM
There is a dvd out at the moment that was done by a couple of Dutch guys last year. It is called 'The Call of the Sapphire".

Don't know if it is available anywhere else but up here.

It shows them using a throw screen.

I will try to have a look at who is distributing the dvd today at report back.

I saw that DVD at Clermont Gold Detectors.