I've been reading through the forums on investment castings but i'd like to ask a few questions on how to do it.
I work for an aluminum foundry and CNC shop and im actually a pattern maker, we do greensand, airset, shell core, permanent and die casting so i'v been around and worked with them all aside from investment. If you're interested in seeing some of my company's work and setup you can check out my youtube channel, i've posted some videos over the basics so far. Im the third generation of a family owned Aluminum foundry and pattern shop.
dzuari's Channel - YouTube
Im currently designing the pattern and corebox for a fairly complex part, and im afraid their is just to much negative draft to get the mold and boxes to pull and the next variation of the part i know will not be able to be molded so im starting to look towards lost wax.
So, what im looking to do specifically is take the part and dip it in a slurry and get a hardened shell around it.
Now we buy in bulk shellcore silica sand which has a heat activated resin in it(500°F) and we also buy reclaimed straight silica sand for airset then mix it with an air activator. Would i be able to mix either of these sands with a investment plaster to get what im looking for?
Ive also been looking on some jewelry supply sites and have ran across these products
Gold,Silver, or Brass Casting Investment
If im reading those products correctly, they are sand already mixed with the plaster, just add water?