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looking to advance from sand casting to lost wax general chat

by winterk

iv been playing with the sand casting but to get more range I need to go to lost wax casting but I don't have a kiln to burn out my wax or if it works pla I know people have been doing it with mixed success but how is the best way to burn out my pla if its possible

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by uziblaster392

hi i am new to 3d print design i have found a stl file on thingiverse and would like to turn it into a cast can some here help me

please see attached files

i have tried to the best of my knowledge but still can not get a mold/cast made from the files

any help appreciated

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by sculpt3

Hello, I am new to the 3_-d modeling and printing but have a lot of knowledge in lost wax casting.

I recently invested a pla print, burned it out and poured in bronze. This casting was small but poured well.

Is anyone else doing this and what kind of pieces are being created.

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Greensand formula

by _sOnGoKu_
  • Silica sand fine.
  • 10% bentonite.
  • 5% water (approx).
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FOUNDRY IN PLASTER CAST - guide for beginners (like me)

by _sOnGoKu_

Casting plaster mold

  2. I found this info on internet , and really help me lots "like a beginer im"
  3. To begin ...  casting with plaster molds is similar to sand casting except that the mold is made of plaster (2CaSO4 - H20) instead of sand.
  4. To improve ...  additives such as talc and silica sand is mixed with gypsum to control shrinkage and curing time, reduce cracking and increase endurance.
  5. Process ...  To produce the mold, a mixture of plaster and water is made, it is emptied into a plastic or metal model in a molding box and allowed to set. In this method, wood models are generally unsatisfactory, due to extensive contact with water plaster. Set. hardening process of gypsum plaster or lime mortar
  6. Part of the process ...  The mold should be left to cure about 20 minutes before removing the mold and then be cooked for several hours to remove moisture. Even cooked, gypsum is not clear from the content of moisture.
  7.  Consistency allows the plaster mixture easily flow around the pattern, capturing detail and surface finish. This is the reason that foundries made plaster molds are notable for their fidelity to the pattern.
  8. Scope ...  Its scope includes metal molds for plastics and rubber, impellers for pumps and turbines, and other parts whose forms are relatively intricate
  9. Advantages ... Castings have fine details with a good surface finish. Dimensional accuracy   Ability to smelters thin cross section.  Low cost.  Mass production.  Speed ​​of creation. 
  10. Disadvantages ...  plaster molds can not withstand temperatures as high as the sand molds. Therefore, they are limited to smelters low melting point such as aluminum, magnesium, and copper alloys.
  11. Part of the disadvantages ... Cured plaster mold is one of the disadvantages of this process, at least for high-volume production.  The plaster mold is not permeable limiting the escape of gases from the mold cavity. << Solution  evacuate air from the mold cavity before pouring
  12. Part of the disadvantages ...  The problem facing smelters is that the strength of the mold is lost when the gypsum is dewatered and, in the opposite case, the remaining moisture can cause defects in the cast product, therefore it is necessary find a balance between these undesirable alternatives.
  13. Conclusion ...  The plaster mold is ideal for rapid tests where you want to create pieces with fine surface finishes but do not forget to miss the gas well. If it is intended to continually use the mold should not forget to add the additives to the mixture for better resistance.


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