Stone in Place Investment Casting 

The surrounding investment holds them in place.

@@craigdabler-thediycastings7511 I've been thinking the same. So from your answer it sounds, to me, as if there has to be cavities around the stone, so it "grabs"baround it. Is that correct, because I wouldn't think, that the investment would "stick" to the stone?

Of course, as well as helping to prevent the investment from hitting the wax in a drop down pour and breaking it off.

Water boils at 212* F so wax will steam out if its melting point is below this.

This is a system I created that uses a 60 minute burnout.

They have cooled overnight.

The investment is contacting the stones on both the front and the back so once the wax is gone they are still completely secure

jewelry makers use a crock pot or other warming non metal container with water and some sort of pickling solution to take the surface oxidation off the castings. It's very common. I use PH Down, the jewelry tool companies sell it as Sparex plus there are other more environmentally friendly options as well.

There is no heat cycle. You just set the flask in place, turn it on for an hour and cast. Actually, I run it at level 5 for 30 minutes and max the last 30 minutes.

Thank you!

no

No because this setup doesn’t get hot enough to harden the investment to a hardness needed for the centrifugal force. Vacuum is gentle enough that it works.

60 minutes. I use the silicone pad from Rio Grande.

Injection wax melts at about 160* F.

@@craigdabler-thediycastings7511 I just looked up carving wax melting points. They are approx 220-240. Do you think they’d still work with your steamer/burn out unit?

Steam is only 212* F so anything above this won’t melt.

This is just a 3 CFM 1 stage but the vacuum chamber is so small it doesn't need anything bigger.