-----Original
Message-----
From: Brian Cox
<ojaivalleybeefarm@dslextreme.com>
To:
personal_submersibles@psubs.org
Sent: Mon, Sep 20, 2010 6:58 pm
Subject:
RE: [PSUBS-MAILIST] Sub as panoramic film platform
Hi
Jon,
The plexiglass is definately going to be a fraction of the cost of the cast
acrylic. The reason for this is that I have a few thousandths of an inch
differences between the eight viewport frames and I'm concerned that they will
each have to be custom machined to fit. I'm hoping that the variation
will be small enough so I would be able to just have one lens fit all the
viewport frames.
Brian
Hi Brian,
Acrylic and Plexiglas are
one in the same. Given the thickness of 1.5 inches I can't see any
financial benefit to prototyping with a low grade Plexiglas which no doubt
is going to be very expensive regardless of the lower grade. If it is
machining that you want to play with, you might try calling around to see if
you can get a small remnant. If it is fit-up that you want to play
with, how about using a 1.5 inch Styrofoam panel from Home Depot or
Lowes?
Jon
On 9/20/2010 11:20 AM, Brian Cox wrote:
Greg, I have already machined my viewports
and they are just waiting for me to get the acrylic lenses to fit
in. I was thinking that I could purchase some regular plexieglass (1
1/2" thick) and machine those so I could play around with how
everything is going to fit together. Can you tell me if the
machining properties are much different between the cast acrylic and
regular "low grade" plexieglass? I imagine that the cast
acrylic would be a denser material so it may machine and polish much
differently. Thanks,