hi Miker thanks for your advice, hope there i'll find the solution.

i am unble to open the posts of the forum related my problem as well to post my own.so tell me how can i?

Shahid

Place your computer cursor over the archives button on the upper right side of the ArtMetal home page. A drop down menu will appear. Move your cursor down to "Bramblebush" and click on it. A page titled "The Artisan's Workplace and Learning Center" will appear. Move your cursor to "TechTalk Forums (archived)" and click on it. A list of Forums will appear, the top one is "Casting Forum". Place your cursor on "Casting Forum" and click it. The first thread in the list is "Investment Formulas". Click on that title and you will be able to read the dialogue between Darrell Chapnick and Bruce Fink on plaster based investments for casting.

There is additional information in the archive about plaster based investment. Another way to look for that information is to place your computer cursor over "Bramblebush" and a menu to the right of "Bramblebush" will appear. Move your cursor to "casting forum" and click there. A List of all the threads (questions) in the archive will appear. Scroll down to the 1999 period and you will find more information on plaster based investment.

Remember, these archives are closed so you can't post a new question there. You will have to post them on the new ArtMetal website. If you haven't done so you might join the ArtMetal "Casting Group". Hope this helps. MikeR

Hi Miker
you've really solved my problem ,now i'll just start experimenting in my work hope it will better .As thers's no policy of this site site to give your link but i'll like to share my work with you.
"www.sculptor.notlong.com" .
Regards
Shahid:)

Shahid,

You have been very, very busy . . .

That is a lot of work, and some very nice pieces.

Gene Olson
Sculptor
Elk River, MN

hi Gene olson thanks for stopping in and comments. i am pleased you like my work .you mighht'nt believe its half of my work, most i've no record and most to take photographs for upload.as soon it'll complete i 'll share with you.
Regards
Shahid:)

Hello Sahid Actually Plaster of Paris is same as #1 Molding Plaster and is fine for Investment casting. I use a standard mix of about 50% sand to 50% plaster and vary the proportions only for exceptions. The sand used is a general blend called Brick Sand here and is commonly used to mix with Portland Cement for concrete and mortar. Nothing fancy at all. The varying sizes of the grain in it are a plus with the coarsest grains being slightly smaller than grape seeds. The mix used next to the body of the wax or surface to be cast are often smaller and would fit through a window screen.

To be more precise, put the words Investment Casting in the artmetal search engine and you will get quite a bit of information on this already written. In addition here are a few other related comments:
On investment casting
http://www.artmetal.com/brambush/forum/bramyak1/messages/125.html

On Casting waxes
http://www.artmetal.com/village/chat/main/transcrp/980423MN.htm

On comparing Plaster / Sand Investments vs. Ceramic Shell
http://www.artmetal.com/brambush/forum/bramyak1/messages/177.html

On Ancient Casting Methods
http://www.artmetal.com/brambush/forum/bramyak1/messages/125.html
www.artmetal.com/bpfink Bruce P Fink

bpfink

Miker,
thanx again for help and comments .its true that you 've brief me each detail of the process that its not a problem for me now. i always get problems with the functions of computer , mobile, digital cameras etc....but my work .... you are right i take it as a challenge just like mountaineer. i could'nt reply you last day because my net was not working.
Regards
Shahid