Metal casting

Foundry
http://www.practicalmachinist.com/vb/general/anyone-have-homemade-aluminum-foundry-r-cast-s-machinable-strength-237445/ The crucible material is important too- cannot use steel/iron pipe anywhere in the process, it will dramatically contaminate the aluminum, which is effectively a pretty good solvent for it when molten. Also consider how you're going to evaluate the alloy in your castings, which means probably you'll need to pour several molds per melt so you can cut up and test some, then repeat the process until the final alloy more or less conforms to some kind of spec adequate for the application.

For openers, use a metal of known alloy. One that has worked well is 713 (Tenzaloy™). After that are good foundry practices, degassing, keep iron away from the melt, good mold practices such as gating, risers and venting.

http://web.archive.org/web/20060214123826/http://www.aomevents.com/conferences/afi/papers/Taylor.pdf The Effect of Iron in Al-Si Casting Alloys

If you want to make a casting then you need a cast alloy. thus you melt castings, transmission cases, cylinder heads, etc. As previously stated it must be in a refractory lined vessel. DO NOT ADD OTHER CRAP. Cans and chips will burn up and create a lot of dross to be skimmed off. Sheet items, wire, etc will alter your alloy and likey prevent it from flowing and filling the mold. A layer of common table salt will reduce oxide formation. I'm sure it can be done but is it worth while? Is this an irreplaceable part?


 * http://alloyavenue.com/vb/forum.php Casting foundry discussion forum.
 * https://www.reddit.com/r/Metalfoundry/comments/37k7bb/aluminiumzinc_alloys_what_composition_gives_the/

Oxidation of melting metals
http://www.rsalloys.eu/cmsMateriali/produzioni/13/aluminium%20beriyllium%20master%20alloy.pdf Small quantities of beryllium, when introduced to magnesium and aluminum melts, provide substantial manufacturing benefits in terms of direct cost savings and pro- duct quality. When beryllium is added to the melt in small quantities much of it forms beryllium oxide. As a surface film, beryllium oxide creates a superior barrier to further oxidation. The improved barrier inhibits dross formation, limits magnesium ignition and improves metal yield. By preventing oxygen migration into the melt, the beryllium addition enhances metal cleanliness leading to improved mechanical properties and visual characteristics of the casting.

http://www.backyardmetalcasting.com/faq.html Can I use soda and/or beer cans as an aluminum source? Yes you can but there is a "trick" to using them successfully. Since the cans are so thin they easily burn and oxidize rather than melt. For this reason many people say they should not be used. But if you already have a good pool of molton aluminum in the crucible then the can can be melted efficiently by crushing them (top to bottom) and dropping them into the pool. If the dry cans are pushed below the pool's surface they will melt and be less likely to oxidise. This aluminum is almost pure (unlike car cyclinder heads which are alloys). So the metal will usually shrink more when cast. but it is extream;ly shiny making it good for small decorative castings.

http://www.substech.com/dokuwiki/doku.php?id=degassing_treatment_of_molten_aluminum_alloys

http://www.hkramer.com/4KramerGoodFoundryPractices.pdf good foundry practice

Burner

 * http://metalcast.boorman.us/reil_1.html  Ron Reil burner.
 * http://www.anvilfire.com/article.php?bodyName=/FAQs/gas_forges.htm
 * https://www.youtube.com/watch?v=qPnSb3yzytE 24min old vacuum carpet clearner, used motor oil and propane mixture for melting cast iron. (see Sand casting)

Foundary

 * http://www.youtube.com/watch?v=GXSCx50LlNo&feature=related
 * http://www.gknsintermetals.co.za
 * http://www.amazon.com/Charcoal-Foundry-Build-Metal-Working/dp/1878087002/ref=pd_sim_b_5
 * http://www.amazon.com/Milling-Machine-Build-Metalworking-Series/dp/1878087037/ref=pd_sim_b_6 build own machine shop. Author David Gingery many other books on building furnaces, gas , electrical.
 * http://www.youtube.com/watch?feature=endscreen&NR=1&v=HHk-zvJ_jr4 make own greensand for foundary. Can be re-used thousands of times, CNC isn't as economical as casting the Stirling cnc
 * http://www.foundry101.com
 * http://www.amazon.com/Metal-Casting-Manual-Small-Foundry/dp/0970220324/ref=pd_sim_b_3
 * http://www.artfulbodgermetalcasting.com/
 * http://www.amazon.com/Small-Metal-Rubber-Parts-Edition/dp/0830604146/ref=pd_sim_b_1 How to cast small metal parts.
 * https://www.youtube.com/watch?v=5Itw1iAbaoE Cast Aluminum Dominoes | Corian Matchplates and Snap Flask (Part 1) . Parts milled with router for casting. https://www.youtube.com/watch?v=4DwuSpmhMKs Cast aluminium dominoes, multiple parts per cast. sprue, riser. prt.2

Foundary with coal
http://www.homebase.co.uk/en/homebaseuk/kos-fire-cement-1kg-005621  fire cement 5 pound
 * https://www.youtube.com/watch?v=lSoWxG30rb0, https://www.youtube.com/watch?v=hHD10DjxM1g Mini metal foundary by Grant Thompson, Preferred solution
 * https://www.youtube.com/watch?v=tH-PaNugz9w Lost styrofoam by Thompson, using only play sand. Attach foam riser to plastic part and pour metal. Not as accurate as lost pla(Plaster of paris sand mix), but will work for gears, hammers or any type of functional tool.


 * https://www.youtube.com/watch?v=UXeCYmAQg6U Iron barrel forge. http://shop.clay-planet.com/kast-o-lite-30-li-plus.aspx, barbeque paint
 * https://www.youtube.com/watch?v=tH-PaNugz9w

https://www.youtube.com/watch?v=qPnSb3yzytE casting with sodium silicate sand.

https://www.youtube.com/watch?v=jtvOkI_pvMI weld aluminum with aluminum brazing rod, no welder used.

Break drum foundary
lawnmower, provides large cavity for coal. Plumbers nozzle at bottom periodically removed to extract ashes.
 * https://www.youtube.com/watch?v=bjnXPYryoJQ by uploader modernblacksmith. Sells in kit form. Die grinder with carbide bit enlarges center of break drum. Any steel bits on the eye is removed with a magnet(wear glasses and have a magnet nearby) out of the eye and don't blink the eye, the metal will scratch the cornea. Wear swimming goggles for complete eye coverage. Fumes from galvanized steel are fatally toxic. Clamp pieces to bench,don't hold down with hands and don't wear gloves, it gets caught in the drill bit twisting fingers.
 * https://www.youtube.com/watch?v=kfQHOGDHp4Y break drum forge attached to old
 * https://www.youtube.com/watch?v=kfQHOGDHp4Y break drum forge attached to old

Electric arc furnace
https://www.youtube.com/watch?v=VTzKIs19eZE Battery electrodes, small diy furnace out of fire brick.

Attachments
Use https://en.wikipedia.org/wiki/Gaffer_tape for attaching pipes to blowers. It is stronger than duct tape.

cast iron
https://www.youtube.com/watch?v=1DyeESQpac0 Fireclay at base of 20l oil drum. Sodium silicate glues Kaowool to steel drum. Zircon paint protects wool

https://www.youtube.com/watch?v=gFOq88iQg60 Make foundary from discarded propane tank. concrete form tube from building supply for blanket.

Foundary lesser
Interesting but not priority.
 * https://www.youtube.com/watch?v=71s6HpuG_hQ Swallow forge
 * https://www.youtube.com/watch?v=ClULe1DfsRM soup can forge

Suppliers
http://www.budgetcastingsupply.com/

http://www.haywardrefractories.co.za/products.php crucibles, refractory cement

Foundaries
http://www.foundries.org.za/wp-content/uploads/2015/06/FERROUS-DIS-LIST-39-OF-03-JUNE-2015.pdf Iron casting foundaries in SA have first choice to purchase bulk scrap before a scrap yard is allowed to export.

http://www.itac.org.za/upload/gg37992_nn714.pdf Price preference calculations for scrap metal will be done by ITAC for all the different types of scrap metal listed in paragraph 3 (and the various grades thereof) using, in general but not exclusively, Scrap Index.com, http://africa.recycle.net/exchange/ as an international benchmark price. From the average price achieved during the previous month, or quarter, where applicable, for the different types and grades of scrap metal, an amount of 20% will be deducted to reflect the price at which scrap metal must be offered for sale to the domestic consuming industry in accordance with ITAC's Report 441. Such a price will be ex-works the yard of the applicant. cans are talab/tale

Glues
http://www.fiero.nl/forum/Archives/Archive-000002/HTML/20050818-1-049767.html ABS plastic to metal bonding by versachem, plastic welder

Links

 * 3d_printers Lost PLA or ABS method. Uses ronreil burner
 * https://www.youtube.com/watch?v=8fpzNK3d0rs Degassing with sodium carbonate sold as soda crystels. Insert into alum foil and place inside of molten alum. Degassing removes hydrogen, hydrogen creates pin holes on casting. add exf326 drossing powder, Potassium aluminum floride. \\\
 * Sand casting
 * https://www.youtube.com/watch?v=20iYekoQUUA lost pla method. Metal grid over plastic parts, tape rapped around the grid. sucks airbubbles out of plaster with vacuum pump. Uses wax for riser and runner.
 * https://www.youtube.com/watch?v=WXFRRg8YMT0 Titanium hammer production. A wax casting is made first. Process is Patentsed. Hammer is lighter prevents carpenters elbow or RSI.
 * https://www.youtube.com/watch?v=W1VF_iVQmM0 copper melting, brick foundary https://www.youtube.com/watch?v=RsobLmrOfxo , burner construction https://www.youtube.com/watch?v=uA4yI_twYRI
 * https://www.youtube.com/watch?v=2bTesd75Wic home made propane furnace