[PSUBS-MAILIST] Pre-machined Acrylic Prep

[Alec Smyth via Personal_Submersibles]

Greg Cottrell did too. It was the size of a small room, so you could walk
into it. As I recall constructed of plywood with insulation inside. There
were lots of fans to ensure that temperature was evenly distributed. We
could ask Greg for more details, as this was many years ago.

Best.
Alec

On Fri, Sep 2, 2022 at 2:43 PM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Jon, yes I did and it was no problem, especially for you.
> Hank
>
> Sent from my iPhone
>
> On Sep 2, 2022, at 8:55 AM, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 
> Anyone out there normalizing their acrylic?
>
> Section 15 of Stachiw's Handbook of Acrylic is dedicated to stress
> relieving processes for acrylic viewports.  Stachiw states that such stress
> relief is required to reduce the premature crazing and failure of acrylic
> surfaces.  Section 15.2.1 discusses "normalization" of the material and how
> it both relieves stress and changes the physical properties of it.  The
> amount of time required to heat, bake, and cool the acrylic material
> depends upon thickness, but is lengthy in all cases.  I have reached out to
> numerous acrylic molders in New England and found that none of them have
> ovens that meet the technical requirements for proper normalization or
> annealing as described by Stachiw.  That leads me to the conclusion that
> I'm probably/definitely going to have to build my own oven for such
> purposes.  I think Hank did build such an oven but I haven't heard of
> anyone else doing so.
>
>
> Jon
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