[PSUBS-MAILIST] Program

[Sean T. Stevenson via Personal_Submersibles]

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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