You can do iris portals yourself.
The easy way is with card and a compass, just mark it
out as if you are drawing a rose - it is easy to do
but hard to explain. Place the compass anywhere on the circumference and draw
another circle, repeat where the second circle intersects the first and
repeat. You will have six circles around the circumference.
You can do the same with plasticard and a compass cutter.
I have explained it very poorly but if you play around with a compass you will
soon get it.
Add a few more layers of card or styrene and you will have something useable.
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http://lists.csua.berkeley.edu/mailman/listinfo/gzg-lThat should work
very well. Easier than casting them.
Roger Books
> On 10/26/05, Michael Robert Blair <pellinoire@yahoo.com> wrote:
I used the iris valve trick a few years ago building a repair dock for Full
Thrust. I discovered it more or less by accident. The dock is like many other
projects sitting nearly finished. The closer something comes to completion the
more I loose interest in it. The part of model making I hate is adding the
details, I know this is maybe the most important, make or break, stage and
that most people love it but I hate it, give me a blank sheet of foamcore or
plasticard any day.
You could cast the portal for the Iris valve and then add the plasticard disc
separately for closed or leave out the disc for open.