[PSUBS-MAILIST] Clearances

[hank pronk via Personal_Submersibles]

 Rick, insitu machining means the whole sub sits in the milling machine.  Or it is a bolt on tool like a flange facing machine.  I just asked CHAT GBT if a secon annealing can be done and it says it is not recomended, becuse it can cause micro fractures.   The hand book of acrylics will tell the story either way.Hank
    On Tuesday, December 10, 2024 at 03:34:54 PM MST, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 I am not familiar with what you call "in-siku" machining? 
Rick
On Tue, Dec 10, 2024 at 11:56 AM Daniel Lance via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Rick,Sean's suggestion of finding a machine shop that can do the in-situ machining to enlarge your viewport frame would probably produce the least amount of hassle. That's assuming there will be enough metal left on the perimeter flange after the machining process.If you have access to Jerry Stachiw's book "Handbook of Acrylics" it would certainly be worth the read . It goes into great detail outlining the recommended procedures for fabricating, machining and then annealing. A second annealing isn't out of the question ...it just must be done at carefully controlled lower temperatures.If you decide to go with reducing the diameter of the acrylic viewport , one possible company that might be able to help you is " www.hydrospacegroup.com" . If not they might be able to recommend someone that can ?Dan 
On Mon, Dec 9, 2024 at 10:18 PM Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Sent from my iPhone
I got a real surprise yesterday, I went to fit my large viewport in front on my K-350 and it wouldn’t slide inside the receiver that I had machined for it. They made it about 1/4” too small!
I should have double checked it before welding it into the front head but didn’t. 
I had the viewports cut in California and is to speck, 15”.  Kitteredge called out using gasket but a lot of you I believe used Silaflex that comes out of a tube.
I found someone who can chuck up something that is 16” in diameter so will have him turn it down 1/4” or so, so it will fit in the receptacle but I need enough of a gap on the edges for the Sikaflex to ooze out. 
Your thoughts? 
Rick
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