Category:Casting Shop: Difference between revisions
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Revision as of 16:31, 9 March 2024
| Casting Shop | |
|---|---|
| Casting Shop | |
| Building | {{{building}}} |
| Lead | Tess Faraci |
| User email list | members@artisansasylum.com |
| Tool Testers | |
| Hours | Same as membership hours |
Shop Description
The Artisans Asylum Casting Shop offers equipment and training for two main processes: Sand Casting and Investment Casting.
The Sand Casting program at the Artisans Asylum allows the reproduction of objects in metal with a level of detail suitable for small sculpture, jewelry, and select engineering applications.
— This method is suitable for beginners as well as experienced shop users who are interested in producing a cast piece within the time period of a few hours.
The Investment Casting program at the Artisans Asylum involves a two to three day process that allows the reproduction of complex shapes in a way that preserves a high level of fine detail.
— This method is suitable for intermediate to advanced shop users interested in achieving exceptionally high quality and precision in their cast objects.
The Casting Shop encourages experimentation and knowledge-sharing for the production of jewelry and artwork achievable using equipment appropriate to our shop. Our facilities are oriented toward hand crafted pieces the size of jewelry and slightly larger — we do not have the resources to support larger foundry work.
Casting Techniques
| |
|---|---|
| Bronze at 2000 F |
Investment Casting at the Artisans Asylum, sometimes referred to as Lost Wax Casting, starts with the creation of a jewelry-sized object, or “pattern,” often made with wax.
— The pattern is encased in investment, a silica and gypsum based substance that resembles plaster.
—Once the investment has set, the wax is then “burnt out” using an overnight kiln program, producing a cavity into which the molten metal can be poured. The kiln program also further hardens the investment.
— At a pre-arranged time the next day, the flask containing the investment is pulled out of the kiln and immediately put on a Vacuum Table, where the molten metal is then poured.
— Once metal has cooled enough to solidify, the hot flask is then “quenched,” or submerged in a bucket of water that quickly liquifies the investment, allowing the finished casting to be easily retrieved.
Sand Casting at the Artisans Asylum involves the use of casting sand, an oil-based sand that significantly reduces the water vapor-produced concerns that come with water-based casting sands. The shop supplies Petrobond as the shop's most commonly used casting sand, and we also supply Delft Clay. Note that use of Delft Clay requires that extra vent holes be constructed in the sand mold, to allow displaced air to escape during the pour.
— Sand casting allows the reproduction of the pattern in a matter of hours, without the destruction of the original pattern.
A detailed overview of the Investment Casting process at the Artisans Asylum is available here:
https://drive.google.com/file/d/1qid-hoZIWx5stFZQGZ09LY4L7qxmhOA8/view?usp=sharing
Details on mold construction with Petrobond Sand are available here:
https://drive.google.com/file/d/1mP0Iwi35cRk-C8SCcghau3G-CnKU2bwY/view?usp=sharing
A YouTube video on the use of Delft Clay can be found here:
https://www.youtube.com/watch?v=p6D9gM1o5Ig&t=2s
List of Primary Tools
For Melting Metal:
— Electro-melt(s). Link to: Electromelt Tool Resource Page
— Oxy-Propane Torch. Link to: Casting Shop Oxy-Propane Torch Resource Page
— The shop provides appropriate graphite and clay-silica crucibles.
For Investment Casting
— Investment Hood
— Kiln. Link to: Sentry Kiln Tool Resource Page
— Vacuum Table. Link to: Vacuum Table Tool Resource Page
— The shop provides Ransom & Randolph Ultra-Vest investment and casting flasks in select sizes.
The product sheet for Ultra-Vest investment can be found here:
https://drive.google.com/file/d/1IVs3M5fmvPaCoeO9CmTQ55ZyzfqehWEH/view?usp=sharing
For Sand Casting
— The shop provides Petrobond sand, metal mold-making flasks in select sizes, and mold-making tools.
Tool Documentation
| Tool Info | Class | |
|---|---|---|
| Vacuum Table Tool Resource Page | RED | |
| Sentry Kiln Tool Resource Page | RED | |
| Electromelt Tool Resource Page | RED | |
| Casting Shop Oxy-Propane Tool Resource Page | RED |
For a YouTube video on how to use the shop's vulcanizer:
https://www.youtube.com/watch?v=XasXISlbQoI
Shop Safety
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|---|---|
| Buddy Up! |
For safety purposes, the Casting Shop requires that shop users work in pairs when pouring molten metal.
— Experienced Casting Buddies can be found through the shop’s Google groups email listserv.
To subscribe, send a request email directly to the list: castingshop-users+subscribe@artisansasylum.com
OR
Send and email to the Casting Shop Lead requesting to be manually added: castingshop@artisansasylum.com
Proper attire and PPE are required, especially when pouring molten metal:
— Proper Attire: Long Sleeves and Long Pants in Natural Fibers (cotton works well), Closed-toe Shoes (preferably leather). No loose hair or jewelry.
Remember: Cotton will not prevent burns. Natural fibers are a way of ensuring that melted synthetics like polyester do not complicate a burn.
— PPE: Safety Glasses (shade 3 when torch melting metal or looking into a hot kiln), Leather Apron, Heat Resistant Gloves. Dusk mask or respirator when mixing or cleaning dry investment.
At minimum, dust masks are required when mixing investment and when cleaning dry investment spills. Respirators may provide additional protection. The shop maintains a supply of dust masks. For better fit and protection, frequent shop users may want to supply their own respiratory protection.
Approved Materials
Pattern Materials approved for use in the Artisans Asylum Casting Shop
— Wax (injection or carving)
— Organics - generally approved, especially for plant materials, but ask first.
— PLA
— Ask first on Castable 3D printing resins.
— To add materials to the Approved Pattern Materials List, discuss with a shop steward and propose a workable, clean melt‐out/burnout profile.
Metals approved for use in the Artisans Asylum Casting Shop
— Brass, Bronze, Copper, Silver, Argentium, Gold, Aluminum, Pewter, Bismuth
— Metals we cannot do, given high melting points: Titanium, Steel / Iron, Platinum
— Disallowed Metals: Lead, Magnesium, Anything else with flammability / toxicity issues.
No random scrap and no unknowns
Tool Testing in the Casting Shop
Tool Testing in the Casting Shop ensures shop users are aware of and understand shop safety protocols, and are able to operate the shop’s “red” tools without:
1) hurting themselves
and
2) without creating excessive wear and tear and/or damage to the tool.
The Casting Shop has four “Red” Tools that require training and testing prior to use:
- The Electro-Melts
- The Sentry Kiln
- The Vacuum Table
- The Oxy Propane Torch
Note: Given the small size of the Oxy Propane Torch crucibles, and the time it takes to melt larger quantities of metal with this tool, it is recommended that the torch be used for small patterns and in situations where it is important to tightly control the temperature of the molten metal. Small silver castings typically benefit from a torch melt.
Testing and training on the Oxy Propane Torch is available upon request to those who have been trained and have successfully tested out on the tools required for either Sand Casting or Investment Casting.
To schedule a tool test, you can either:
1. Attend one of the Casting Shop’s monthly Tool Testing Events. This is the preferred method of tool testing for the Electro-melts.
2. Schedule a test with a Tool Tester. Visit the Tool Testing page of the Artisans Asylum website for more information: https://www.artisansasylum.com/tool-testing
3. Connect with either the Shop Lead or the Assistant Shop Lead by sending a message to the Shop Lead email address at castingshop@artisansasylum.com
Bismuth and Pewter
Our tools for melting bismuth and Pewter are privately owned and therefor require a light training session. This is to review safety protocols and to ensure familiarity with shop procedures.
Since the temperatures involved are equivalent to that of a hot kitchen oven, no casting buddy is required as long as the shop user knows where first aid supplies can be found, should a burn occur. THIS IS THE SHOP'S ONLY EXCEPTION TO THE SHOP'S RULE OF CASTING WITH A BUDDY WHEN POURING MOLTEN METAL.
When pouring molten bismuth and pewter alone, it is suggested that someone else in the building be made aware that metal is being poured, as a safety backup.
To receive training and testing, contact a tool tester, the Assistant Casting Shop Lead, or the Casting Shop Lead. Training for bismuth and pewter can take place during the Casting Shop’s monthly Drop-by Hours.
For more information:
https://drive.google.com/file/d/11BUyXPz6xNDHGcTSYjh7JpLnMkvn-KYE/view?usp=sharing
Contact Us
— Send an email to the Casting Shop Lead at: castingshop@artisansasylum.com
— To stay informed, subscribe to the CastingShop-Users Google groups email list.
1. Send a request email directly to the list: castingshop-users+subscribe@artisansasylum.com
OR
2. Send an email to the casting Shop Lead requesting to be manually added: castingshop@artisansasylum.com
Shop Calendar
Click below to find the Casting Shop's Class and Special Event Calendar:
Pages in category "Casting Shop"
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