[PSUBS-MAILIST] annealing fixture

[hank pronk via Personal_Submersibles]

Brian, yes it’s polished but only mildly. I still have to finish to 2000 grit, then polish. I only had 1500 grit on hand
Hank

Sent from my iPhone

> On Oct 16, 2019, at 10:16 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hank,         I was checking out your photos from your machining,  it was kind of hard for me to figure out exactly how you are doing it but i noticed how clear everything is, you must have had to do some polishing correct?    When I was machining my viewports ( the sides) I had to polish to get a clear finish.  
> 
> Did you check into the glass?
> 
> Brian
> 
> 
> 
> --- personal_submersibles at psubs.org wrote:
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Subject: [PSUBS-MAILIST] annealing fixture
> Date: Wed, 16 Oct 2019 11:15:37 +0000 (UTC)
> 
> Hi All,
> I am trying to determine the best way to support my new dome when I anneal it.  I am concerned it will deform because when I did the first heat treatment required prior to machining, the block bent.  I deliberately  supported the 4 inch thick block at each corner to see how it would react.  The bent block is not a problem, in fact it helps me.  I need some guidance with this so I don't ruin 50 hours of machining.
> If I can't find the information, I plan to test different ideas with old ports the same thickness in the oven.
> Hank
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