Centrifugal & Vacuum Assist Casting

[mannullll]

vacuum 3 CFM ?????

[10000Monkeys]

Interesting stuff.

At about 2:50 you use a 'vacuum table' - I've been looking for a cheap commercial kit - what's their proper name and where could I get one in the UK? Thanks.

[deaftodd]

Nicely done.

[grantham418]

We show a controller which we programed for a 12 hour burnout. During the first two hours the oven was held at 300 degrees F. The next two hours the temperature was ramped up to 600 degrees. Next it was ramped up to 900 degrees for another 2 hours and finally brought to 1350 degrees for 5 hours. The controller then slowly lowered the temperature to 900 degrees which is the casting temperature for sterling silver. The controller will hold the burnout oven to 900 degrees until we're ready to pour.

[lakenewell]

I posted earlier and our class has now done a centrifugal cast. I noticed you said the investment was held at 900 degrees. IN the class and in the practical casting book by McCreight. There is a set heating schedule 300 degrees for a certain number of minutes and then to 700, 900 and 1300 The teacher said the burnout schedule was important to getting a good casting.. Do you just go to 900 and keep it there? Thank you so much for this post,

[dijkers]

Dear sir.

Where did you buy the mold clamps you use around 0.46sec?

Thank you for your video!

[lakenewell]

Thanks, I am just going to cast by the centrifugal method in my jewelry class in a couple of weeks but I want to get a vacuum casting system for my own use.

[kwikkeys3]

Thanks for the fine video Rod!

[ooplik]

Thanx so much. You answer a few questions in your demo. Now out to the barn to giver a try. Peace.

[MrKeithElliott]

which do you reckon gives better fills ? I find centrifuge does despite a pretty hi power vac pump ...

[midasmith]

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 :)))))

[stefanmckinley]

so the vacuum is sucking through the flask from through bottom?

[grantham418]

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.

[grantham418]

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.

[heydanno777]

Mr. Grantham, If you had to choose just one process would you choose spin casting or vacuum assist casting? Thanks!

[aethrr]

Thanks for providing insight into processes normally hidden to non-insiders!

Very appreciated

[ficote72]

Where can I find a little melter like that? is it also Neycraft brand?

[grantham418]

Rio Grande sells electric melting furnaces. Also Kerr Automatic electro-melt. These nice little melters are sold by most jewelty suppliers.

[JustMakingComments]

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.

[lvfa81]

bravissssssssimi

[nickjm007]

I bought two of your DVDs. Where have you been all my life, Grantham?

[deyes1drktsf]

Never mind, you stated what it was in the video.

[deyes1drktsf]

Great video. What kind of foundry are you using to melt the casting grain?

[milkytinaben]

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

[YTUsing]

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!

[tknosani]

great!

[lVlagneto]

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?

[grantham418]

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.

[aaron0c123]

what other forms of casting could be used?

[lbush1880]

Nice Video, educational!