[PSUBS-MAILIST] Program

Fri Oct 23 06:22:49 EDT 2015

Hank can you send me the pic as well?  Im just interested.

Thanks
James

On 23 October 2015 at 11:17, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Sean,
> The heads were supplied as perfect hemis, with the edge beveled.  The
> defect is about 5 inches from the weld.  I will send another photo.
> Hank
>
>
>
> On Thursday, October 22, 2015 9:30 PM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Were your heads supplied as perfect hemis, or with a length of flange?
> Weld prep? How close to the rim is the defect? A photo would help.
> Sean
>
>
> On October 22, 2015 6:05:19 PM MDT, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 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 concer! ned
> 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 hemisphe! res, 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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