[PSUBS-MAILIST] bolt on rings

[hank pronk via Personal_Submersibles]

Thanks' guys!Emile, I was thinking that I can not bolt to the curved surface, but ! was thinking I can machine the curve  flat.  Carsten,  Good point, all the welding of brackets etc would have to be done first, then machining last.
I have a crazy idea to build a purpose built lathe for the hemispheres.  Hank
 

    On Friday, November 11, 2016 3:59 AM, "MerlinSub at t-online.de via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
 

 All Hatches on Euronaut are made this way. 
Surfaces has to be machined - both sides. Welding of equipment, seams, holder bracket  etc - closed to the machined  surface is something to prevent.  vbr Carsten 
   -----Original-Nachricht----- Betreff: Re: [PSUBS-MAILIST] bolt on ringsDatum: 2016-11-11T10:21:52+0100Von: "emile via Personal_Submersibles" <personal_submersibles at psubs.org>An: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>   Hank, Bolting somethin on a spher without welded reinforcing is normally no-go.   Connecting 2 hemi’s with a 0-ring should be possible with that thickness. Centring ring would be useful..Some hatch seals are made by just machine a 0-ring groove in a thick elliptical head.The sphere segments of one version of the Trieste were glued! The thick CrMo steel was impossible to weld. Emile Van: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens hank pronk via Personal_Submersibles
Verzonden: vrijdag 11 november 2016 2:52
Aan: Personal Submersibles General Discussion
Onderwerp: [PSUBS-MAILIST] bolt on rings Sean, I know we talked a bit about this idea before but I need a refresher.  Can I machine a hole in a heavy sphere and insert a hatch land\reinforcing ring assembly that bolts to the sphere.  It looks like Karl Stanley may have done that with his front dome.  This idea if feasible makes building a deep diver more realistic.  I am thinking  of trying this on my current sphere just to see if I can do it.  Better to screw up a cheap sphere first.  ;-) Next question, when I look at the Deep Rover sub, it has two hemispherical domes coming together on a two sided land.  I am sure the land also gives the domes side support.  Why would this design not work with two heavy steel hemispherical domes.  I am talking 3 to 4 inches thick.   The  steel domes can easily be machined with a flat land and o-ring grooves.  The idea is to eliminate a very costly weld and it would be pretty darn nice to build with the top half of the hull removed.  Hank
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