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In Pic #13, you can see one Nautilus half resting on its frustum and the other half showing off its frustum above it.
No, you cannot make a straight-walled frustum that you could use for both halves, the udea of the 45 degree wall is to give the
plastic "somewhere to go." when forming around shapes that are close to vertical where they meet the vac-forming table. Otherwise, it seems to bunch up and form big creases.
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Picture #14 Mr. Merriman refers to this as a 'vent verification.' And it did show me that everything would work out just fine.
Except in white styrene, the 'eye' was a question. White sty doesn't behave the same way as acetate. I find that acetate will capture more detail and settle into creases and cracks a little better.
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So there was nothing for it but to go straight to acetate. In #15, I took a close up pic of the acetate vac-form shot to try to
show how everything was captured. But I didn't think I could see it well enough. The confusion of seeing through and taking in the other side was bewildering
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So, in pic #16, I gave a tentative hit of primer for an over-all lighting test. In reality I just tilted the shape to a nearby
light source for a raking angle. For photographic purposes, I have a detachable strobe that allows for all sorts of improved lighting tricks. Thus, I found the eye to be just awfull.
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So, I pried them off to be cast in resin. And that's where I halted as other projects called me away. Those other projects I did finish and
should post them as I think I learned some valuable lessons doing them. I had to learn casting eurethane resins and the mold making. I also realised that I could not cast the "arms" of the Nautilus in
resin-- too fragile and will have to wait till I learn white metal casting (!).
But the resin casting process, when it works, is as much fun as vacuum forming!
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