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Re: [PSUBS-MAILIST] Sub as panoramic film platform



Why not remachine the viewport frames? A little expense up front will save you loads of grief on down the road.
Vance



-----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
-----Original Message-----
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Jon Wallace
Sent: Monday, September 20, 2010 11:28 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Sub as panoramic film platform


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,