I need to design an Iris diaphragm, preferably like the ones in the following
pictures:

http://www.microscopy-uk.org.uk/mag/imgmar06/dismantle6.jpg
http://www.microscopy-uk.org.uk/mag/imgmar06/dismantle7.jpg
http://www.microscopy-uk.org.uk/mag/imgmar06/dismantle8.jpg
http://www.microscopy-uk.org.uk/mag/imgmar06/dismantle9.jpg

or something similar.  I need to be able to re-size it to fit my project, and I
would like to be able to control the aperture size.

I would like to be able to do all of these things, without using a mechanics
simulator, which is difficult because the shutter blades are interleaved.

Any suggestions would be greatly appreciated.

A.D.B.

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