Re: re vacuum forming

rtr@...
Brian Robbins builds clear aircraft canopies for his Bright Star Millenium
and the Swift foot launched sailplanes by radiant and convection heating as
have been suggested on the list. He often uses a small sandwitch oven if
the part is small enough. He uses a bigger oven when the part blank needs
to be bigger. I hope to build him a radient heat source when time permits.
The little sandwich oven has a window so he can see when the blank is
sagging enough to conform to the mold properly.

When his shop vacuum didn't produce enough vacuum he put another
centrifical vacuum in series with it to get enough. This vacuum was
provided by Ron Wickersham, but almost any vacuum will work. His vacuum
forming machine for small parts consists of a five gallon plastic bucket
with the four inch shop vacuum line taped to its side. The form is
undrilled for air flow, but it is fastened to a piece of plywood which has
holes surrounding it, and in depressions in the mold if such are necessary.
These holes port to the 5 gallon bucket. He doesn't find it necessary to
provide a sealant along the lip of the plastic bucket. It seals adaquately
to the plywood board which holds the form.
Ted----------

> From: MIADsgns@...
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] re vacuum forming
> Date: Tuesday, June 15, 1999 2:44 PM
>
> From: MIADsgns@...
>
> In a message dated 6/15/99 5:39:57 PM SA Eastern Standard Time,
> footman@... writes:
>
> <<
> I run a small company that manufactures foot orthotics (supports) -

these

> are vacuum formed over plaster casts of peoples' feet - sounds like you

want

> something that ends up with a flawlessly clear finish - with my equipment

> (home made), my plastic (or carbon graphite & plastic) ends up with an

opaque

> finish that is fine for orthotics, but would likely be lacking for your
> purposes - let me know if you want more info . . .
>
> Christopher Ellacott, D.Ch.
> Chiropodist >>
>
>
> Interested in your home equipment. I made a desktop vac former that works

> well with thin plastic and uses a shop vac. but I need more succion to

form

> with heavier plastic and finer detail. Any clues as to how to modify such

?

>
> Mario
>
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