I perform both centrifugal and vacuum casting. I follow the
directions on the investment and get great results. I primarily use
Kerr Satin Cast II. I have a paper I will share on how to properly
mix you investment and get the proportions exactly right if you would
like for free. There was a great difference in how I do it now and
how I was taught in a class. I have it in MS Word, so you will need
Word to print it out.
Another thing I do is using a drill about 1/8 inch in dia, I drill
holes in the raw investment once it has set up. I drill the holes
right next to the flask and about half way up the flask on the vacuum
side of the flask. I think it helps pull gases out faster. I drill
them about 1/2 inch apart all around the inside parameter of the
I have only had one blowout since I have had the ability to vacuum
cast and I think that time I had a brain burp on the controller and
it got too hot. Okay it may have been operator error. I think it went
in excess of 1300 deg maybe in the 1600 to 1700 deg range.
Let me know if I can help.
2901 Pleasant Acres Drive