Lapidaryforum.net

Please login or register.

Login with username, password and session length
Advanced search  

News:

Welcome new members & old from the Lapidary/Gemstone Community Forum. Please join up. You will be approved after spam check & you must manually activate your acct with the link in your email

Congratulations to auscarver and his Rhodonite Cab!

 www.lapidaryforum.net

Another cabochon contest coming soon!

Pages: 1 [2]  All   Go Down

Author Topic: Investment Casting a Tarantula  (Read 4352 times)

0 Members and 1 Guest are viewing this topic.

PhilNM

  • Global Moderator
  • Sr. Member
  • *****
  • Offline Offline
  • Posts: 334
Re: Investment Casting a Tarantula
« Reply #15 on: March 15, 2015, 11:30:44 AM »

Another question, if I may.... when you did the burn out, did you have to do it upside down so all the ashes and etc fall out or just leave them in there to be encased in the metal?  Are you using silver or german silver? White bronze maybe? Silver is getting so darn expensive, but white bronze is only $13/lb approx. I want to do some bees..... and maybe a beetle or two...
Thanks!
Phil
Logged

MrsWTownsend

  • Guest
Re: Investment Casting a Tarantula
« Reply #16 on: March 15, 2015, 08:33:25 PM »

I use sterling silver casting grain metal and once in a while silver scraps get mixed in.  Here are a couple of sources for casting grain metal:

http://www.hauserandmiller.com/fab/grain.html
http://www.gsgold.com/casting-grain/casting-grain.html

I did buy brass to cast with, but that was for the stick bugs that turned out to be too big for my flask.  :(

Here are some more pics to help explain the flask orientation a little bit:

The items being cast get fused onto a sprue, which is then mounted into a rubber base


The flask is then seated over the sprued items on the rubber base, which closes one end of the flask.  The flask is basically a metal pipe cut to length.



The item is encased in investement, which is basically super fine material very similar to plaster.   After the investment has sat for 24 hours and had plenty of time to cure, you remove the rubber base.  The button is placed on the bottom side in the kiln.  I should mention here that we use a vacuum shaker table to pull all of the air out of the investment immediately after pouring.



Heated to temperature


Husband using borax to clean the crucible before we melt the metal.  We also use the borax to burn out impurities in the silver while we melt it




Place the heated flask directly from the kiln to the cradle, keeping the metal heated


Then using centrifugal force it is spun into the flask cavity


Our highly technical set up


Give the metal time to set in


Then quench the flask



And fish your item out of the bottom of the bucket to see if it turned out good



On this one, they didn't all fill in.  I put A LOT of items on one sprue though. LOL  To ensure a good cast, make sure each sprue is constructed to each item in such a way to allow the metal to flow without much obstruction, make multiple if need be, and don't overload it.

Logged

iceopals

  • Sr. Member
  • ****
  • Offline Offline
  • Posts: 281
  • Ice
    • Iceopals Jewelry
Re: Investment Casting a Tarantula
« Reply #17 on: March 16, 2015, 06:53:48 AM »

Ha!  You forgot the most important part!!   That centrifugal caster is scarier than hell!!!   :LOLOL:
Logged

RxScram

  • I love rocks!
  • Jr. Member
  • **
  • Offline Offline
  • Posts: 57
    • Barnhouse Lapidary
Re: Investment Casting a Tarantula
« Reply #18 on: March 16, 2015, 07:25:42 AM »

Wow... just... wow.  I have a long way to go!
Logged
Jeff Barnhouse

Pietersite, Malachite, Mtorolite, Lapis, Stichtite, etc.
stores.ebay.com/Barnhouse-Lapidary
barnhouselapidary.com

Helene Fielder

  • Administrator
  • Sr. Member
  • *****
  • Offline Offline
  • Posts: 333
    • Helene Fielder Sculptures
Re: Investment Casting a Tarantula
« Reply #19 on: March 16, 2015, 09:14:41 AM »

This could go under tutorials.  Its a great one thanks.
Logged
Helene

Enchantra

  • Head Bead Nut
  • Administrator
  • Hero Member
  • *****
  • Offline Offline
  • Posts: 2627
  • Insane Bead Woman
    • Enchanted Regalia
Re: Investment Casting a Tarantula
« Reply #20 on: March 16, 2015, 11:15:05 AM »

This could go under tutorials.  Its a great one thanks.

Done.
Logged
-Amanda
http://www.artfire.com/ext/shop/studio/EnchantedRegalia
http://www.pinterest.com/amandabielski/
https://www.facebook.com/enchantedregalia/

Coincidence is G-d's way of staying anonymous.  -Rabbi David Abrahams

Sometimes when we are generous in small, barely detectable ways, it can change someone else's life forever. - Comedian Margaret Cho.

A man wearing a helmet defending his country should make more money than a man with a helmet defending a football!!!  (From an email message I received - so true!)

PhilNM

  • Global Moderator
  • Sr. Member
  • *****
  • Offline Offline
  • Posts: 334
Re: Investment Casting a Tarantula
« Reply #21 on: March 16, 2015, 04:34:17 PM »

Thanks!
Logged
Pages: 1 [2]  All   Go Up
 

Page created in 0.201 seconds with 37 queries.