Casting from model to finished casting by Vacuum Assist and Centrifugal methods. View more of my projects at www.granthams.com/Projects
Centrifugal & Vacuum Assist Casting
25 Responses for “Centrifugal & Vacuum Assist Casting”
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Thanx so much. You answer a few questions in your demo. Now out to the barn to giver a try. Peace.
which do you reckon gives better fills ? I find centrifuge does despite a pretty hi power vac pump …
Back in Russia , I had seen machine which used a centrfuge and vacuum prinipals with induction melting , Argon ( or Ammonia gas ) atmosfere and water cooling
)) it was an Italian made machine , fully computerized with speach commands ….she was nice and huge !!! we cast 2-3 kg per flask and never had porosity problems 
))))
so the vacuum is sucking through the flask from through bottom?
Thankyou =)
The burnout cycles vaporize any remaining material and drive off all moisture and vitrify the investment. Investment is porous so metal is pulled into the details of the mold by vacuum. The mold is held at 900 degrees and is not cooled.
3 questions if please…
1
Why do you need to perform a burnout in the oven when you’ve just melted the wax out of the mould using the steamer – does it cure the mould or something.
2
How does the vacuum table work when pouring the hot metal as i thought you would of needed the jar on top again to form the vacuum…
3
Is the mould left to cool afetr coming out the oven before being placed on the vacuum table ready for the pour.
Thanks in advance.
Vacuum assist takes up less space and allows a varity of different size flasks during each casting session. A centrifugal caster has to be balanced for the flask size, so it’s not practical to cast different size flasks during each casting session.
Mr. Grantham, If you had to choose just one process would you choose spin casting or vacuum assist casting? Thanks!
Thanks for providing insight into processes normally hidden to non-insiders!
Very appreciated
Rio Grande sells electric melting furnaces. Also Kerr Automatic electro-melt. These nice little melters are sold by most jewelty suppliers.
Where can I find a little melter like that? is it also Neycraft brand?
I believe these new hydrogen on demand welding torches will work good in this application because the fumes from acetylenes looks nasty when we’re working indoor.
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I bought two of your DVDs. Where have you been all my life, Grantham?
Never mind, you stated what it was in the video.
Great video. What kind of foundry are you using to melt the casting grain?
Very good video for basic information …I am working exclusively “hand made ” jewelry, but I’m planning to achieve a good vacuum casting kit from Gesswein & Rio Grande , for high quality prodution …However, your studio is very clean and nice , with good light ..I give 4 stars …If were more “zoom” details , I could give 5 …I will go to see your website ..
Giacomo
hi grantham,
it was a really nice movie you posted about casting…i put a little movie about a design project of mine involving casting on the web lately…check it on my youtube profile if you like….i have a little question….do you know where to get these handy vacuum machines to get air bubbles out of your ‘investment’ or plastic resin in my case?
greets and thanks!
great!
Thanks for nice compliment. However, the video was done in my shop. It wouldn’t be wise to do it in a kitchen. For production casting the wax models are grouped together on a common sprue. The assembly is called a tree. The oversize flask and is the smallest I have. Investment used is just part of the cost of lost wax casting.
Pouring molten silver like a cup of joe must be dangerous. I think the wallpaper makes this look like a safe thing to do in your kitchen.
But seriously… thanks for posting this.
Is there any reason that the sprue base and flask are so large for such a small object? Do you use any tricks to save investment material?
what other forms of casting could be used?
Nice Video, educational!