Talk:Spin casting

Not hollow

I'm not really sure what the creator was talking about but I currently work running a spin casting machine. My company makes pewter gaming minitures used in war gaming (like Warhammer or Iron Kingdoms) I assure you the parts are not hollow. Nor does gravity really fill the mold. I'm not sure what they mean by tummbled but left it in since it wasn't too bad. Also, I removed the thing about not filling the cavity since that made no sence to me. True, it only takes a small amount of material, but that's because only small parts can resonably be made with this technology. The cavity is filled all the way though or what's the point? I really have no idea who would go through all that kind of effort to make chocolate but I can't directly dispute it. (Maybe that's why some of it's so expensive) - (by Antitrades May 2006)

This needs a whole new article

I agree, what the page says right now is all over the place and pretty misleading and I've only ever heard spin casting refer to either a fishing technique or the silicone mold cast procedure for metal or thermoset plastic parts. Chocolate is news to me. I'm going to try to draft a whole new article on this topic, but I'm not really sure how to link it with related articles and series such as the metal casting series. If anyone is interested in offering some help there, i'd appreciate it.

I'm working for TEKCAST Industries, Inc. a Spin casting equipment manufacturer in the US, so I should be able to provide something accurate and informative.

Pushlatency 22:13, 21 December 2006 (UTC)

Slush Casting

It seems two different methods of casting is being talked about as one here. Spin casting does fill the mold cavity completely by centrifugal force. However, slush casting (cermaic slip, chocolate, etc) the mold is only partically filled and is rotated on all axis (slushed) so the entire wall cavity is coated thus producing a hollow object.

72.151.10.89 17:45, 22 March 2007 (UTC)Stacy Garner

New Article

Okay, so I just posted a new, much more expanded and informative article then that which covered this subject previously. As I had said before, i work for TEKCAST Industries, a manufacturer of commercial spin-casting equipment. I don't intend to use this article a veiled advertisement for our business, but as I add photos and additional details(external links and citations) I feel its difficult to provide a useful context without referring to the equipment manufacturer or source of information.

My impression is that Wikipedia doesn't necessarily encourage vendors to write articles about their markets, but the previous article lacked a lot of important information. If anyone has any suggestions on how to go about contributing appropriately in this situation, please let me know or just comment as I continue to add more about spin casting.

Thanks

Pushlatency 00:10, 31 May 2007 (UTC)

Back to Basics

I hope a bit of reader feedback is welcome. As someone who came to this article with no prior knowledge of the subject (but a general layman's understanding of casting), the thing I would first like to know is why one would want to spin the mold. 74.229.8.169 (talk) 05:09, 2 February 2008 (UTC)

Of course, reader feedback is most welcome, and I especially appreciate your indication that the article is lacking in this way.

I'm not 100% sure I understand your question, but I think you're asking why one would want to spin the mold as opposed to pouring while stationary.

Spinning the mold during the casting cycle applies centrifugal force to the casting material as it is introduced to the mold cavity. Compared to gravity casting, your metal or plastic is pushed into the mold with substantially greater force - this results in the cavity filling much easier, as well as a smoother, more uniform finish with greater replication of detail.

I will try to place a more detailed, better written explanation in the article. But the basic idea is that forcing the material into the mold a great pressures provides better results, hence the populatiry of injection molding / die casting. —Preceding unsigned comment added by Pushlatency (talk • contribs) 19:11, 12 February 2008 (UTC)

Broken Link

The Yahoo group links to:

Group Not Found There is no group called spincasting. Please make sure you typed the web address correctly. If you have done so, the group may no longer exist.

Can anyone confirm if the group has closed or if it has changed it's name? Ghost 9 (talk) 17:36, 14 April 2008 (UTC)

It does appear that the group is gone. I removed the dead link --Wizard191 (talk) 17:54, 14 April 2008 (UTC)

Thanks for bringing this up, the group actually changed it's name, It's now "Freshwater Models Spincasting". I'll add the new link now. Pushlatency (talk) 22:22, 16 April 2008 (UTC)

Proposed merge with Centrifugal casting

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.

The result was do not merge. -- Wizard191 (talk) 17:33, 24 March 2009 (UTC)

---

I noticed there is also an article called Centrifugal casting -what's the difference, if any? Shouldn't that just be a redirect to here? --Satrughna02 (talk) 22:59, 14 November 2008 (UTC)

I've added the merge template. I'm not very familiar with the processes, but from the gist of the descriptions they seem to be the same or similar. Wizard191 (talk) 19:00, 29 January 2009 (UTC)

Both forms of casting use centrifugal force to send metal into the pattern, obviously. Spin casting makes a circular silicone mold with many cavities (from the original models) and spins the mold. Then molten, relatively low temperature metal is poured into the center, and the forces drive it outwards into the mold cavities. IE, the metal is cast directly into "rubber". Standard centrifugal casting generally uses lost wax/investment casting. A flask is placed into the machine and the metal is cast into a plaster or ceramic flask, which is them de-invested to remove the product. This process can use almost any metal - titanium and platinum are commonly cast this way - highly refractory stuff. The two methods are certainly related, but at the same time they are quite different in detail and in their place in manufacturing. Spin cast is for metals under about 700F (something like that, or less)all of which are, incidentally, dirt cheap. Standard centrifuge is used for metals over 1600F commonly. I sincerely don't care if the two are merged, but it must be sensitive to the fact that they both have their place - they are not the same articles under different names, IOW. Jjdon (talk) 00:16, 21 February 2009 (UTC)

It sounds to me that they are two different processes that just share spinning as their common link, so I'm going to have to say they shouldn't be merged. Thanks for the explanation. Wizard191 (talk) 14:54, 21 February 2009 (UTC)

The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

What about the parabolic mirror making technique?

Pioneered by Roger Angel at the Steward Observatory's mirror lab, this makes large (8.4 metres or 28 feet) thin parabolic mirrors by spinning the oven as the glass is melted and cooled. I've generally heard it called "spin casting". References:

• Advantages of Spin-Casting
• Mirror Lab history
• An investigation into the spin casting process
• A Telescope Made of Moondust including a citation to 1966!

Evidence that the term is widespread:

• Optical Fabrication in the Large, p. 6
• Spin-casting a mirror
• Spin-casting of parabolic mirrors using alloys
• Wonderings On Spin Casting Parabolic Mirrors
• Spin-cast Zerodur mirror substrates of the 8-m class and lightweighted substrates for secondary mirrors

71.41.210.146 (talk) 15:21, 8 March 2011 (UTC)

Sounds like a separate article as Spin casting (mirrors). We already have three articles, so there should be a Spin casting (disambiguation) page too. Or would Centrifugal casting (disambiguation) be preferred? Andy Dingley (talk) 19:14, 8 March 2011 (UTC)

The former, but now we have the latter. I've taken the liberty to start Spin casting (mirrors) based on the above suggestions, and to link it to rotating furnace. - Rod57 (talk) 00:15, 17 September 2012 (UTC)

I would also suggest making Spin casting a disambiguation page and changing the title of this article to Centrifugal rubber mold casting. --KaiKemmann (talk) 22:19, 18 September 2018 (UTC)

Mold

Are the molds split into top and bottom or are the parts removed by stretching the mold ? What is the typical number of parts made in each mold in one casting operation ? - Rod57 (talk) 00:23, 17 September 2012 (UTC)