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[hank pronk via Personal_Submersibles]

Sean,This is a new project,  and I am exploring this option because of the imperfection in the pressed heads I got for my pod.  EE told  me they can not press a smooth head without this imperfection.   The imperfection does not go away until a thickness of 2 inches.  The problem stems from changing the die's.  My plan is to have the pieces cut and pressed and will fit over a head that I already have, the head I have will be cut to act as a jig.  My preference is to use two semi heads of coarse, but I am concerned over this wrinkle in the heads.  I could overlay weld and grind smooth as the imperfection is    quite shallow, maybe 1\16 in.  other than this wrinkle, the heads are deadly accurate.I will post a picture of the imperfection,  


     On Thursday, October 22, 2015 5:11 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
   

 For segmented construction, instead of full hemispheres, you only need dished heads of the same radius as your sphere and sufficient diameter to encompass all of the vertices in the segment.I would refer to this as a "dished-only" head, and am unaware of other industry terms. Of course, you only really get the benefits out of segmented construction when you have good control over thinning, and pressing is preferable to spinning for that reason, if your press can accommodate your required diameter.Sean


On October 22, 2015 5:02:45 PM MDT, "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:
What are you making?As I mentioned, the DW hulls are segmented according to a cube projection, so a complete sphere would have six segments / sides and eight vertices, and three times the welding (and subsequent 100% NDT inspection) that two hemispheres would require.You need a template for cutting, and an accurate jig for welding them together.Did you get hemispheres supplied out of spec? Or is this a new project?Sean

On October 22, 2015 4:15:08 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Sean,Do you know how many sections a DW hull has and what is the technical name for what I want to do.  I will ask EE if they will make the pieces. I think Dr Nuytten calls them woks?  I want to sound like I know what I am talking about :-)Hank 


    On Thursday, October 22, 2015 12:27 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
   

 That's just a construction. Any regular polydehron that fits in your sphere can be used as a guide. Nuytco uses a cubic projection, so if you imagine a cube where all of the vertices touch the sphere, the weld lines are the great circle routes between vertices.If two hemispheres don't work for you, the next lowest part count you can go to is four, corresponding to the tetrahedron projection.Sean


On October 22, 2015 11:49:51 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

| Sean, do you have a program that will disect a sphere into equal sections like the DW. I am looking for a way to cut hemis into equal sections to create a new sphere. When we buy heads they have full cerumference dent caused from changing the dies. I am thinking about buying three heads to make one perfect sphere. |


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