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Vacuform pressure question

 
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PostPosted: Mon May 23, 2005 7:13 pm    Post subject: Vacuform pressure question Reply with quote

Hi am begging a storm/clone troopers project and I was curious how much force does the process of the plastic being sucked onto the mold apply, because I know yours were wood molds but I am planning on using either oven hardened clay molds or gypsum cement molds. And mainly I am wondering if in your opinion would either of these hold up in the vacuform machine.
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jegner
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Joined: 30 May 2003
Posts: 2134
Location: Texas, USA

PostPosted: Tue May 31, 2005 4:24 pm    Post subject: Reply with quote

The 'vacuum pressure' is not an accurate term, but I know what you mean. In technical terms, it the amount of vacuum your vacuum source can draw. Almost all your shop vac setups will draw about 3-4 inches of mercury. [in/hg] and that is all. Pull one shop-vac through a second one, and you get 5-6 in/hg. Thats about as good as this gets unless you go with a hi-vac pumo and a storage tank. Then you can get 24 to 28 in/hg. The tank is used as a vacuum resivoir. The larger the tank, the longer the vacuum cycle.

I've tested the gypsum cement, molds, plaster of paris, and they survive my vac-former at least a few times. Plaster of Paris is brittle and break easily.

The oven clay must be able to withstand 350 degree heat without softening or breaking, otherwise it should be fine for a few pulls.

JIm
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PostPosted: Tue Jun 07, 2005 2:30 pm    Post subject: Reply with quote

what
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