[PSUBS-MAILIST] Depth rating for 3D prints

[hank pronk via Personal_Submersibles]

Alec,No problem, just mail them to me.Hank 

    On Tuesday, June 14, 2016 6:16 AM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Thanks Hank, I think the small one would work fine. I suppose we should just print wafers that would fit the small one, with different fill percentages, and see if they crack. 
On Tue, Jun 14, 2016 at 7:02 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alec, It is clear you had a poor experience with a low CT and have ensured it will never happen again ;-)  very nice work.  It is a triumph to build such a sub in a confined space.  I have a couple of options for pressure testing.  the quickest for testing small samples is my tiny chamber.  That one 1.5 in ID by 4 in long,   If you need bigger I have 3.5 in ID by 24 Long.    If you need bigger, I can put something together.As I mentioned, I can weigh and measure the part before and after, also I can measure in time increments.  Just make a test procedure for me.Hank
 

    On Monday, June 13, 2016 8:27 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Alec,You can send me small samples for pressure testing to 3,000 psi.  I can weigh the part before and after.
Hank 

    On Monday, June 13, 2016 7:01 PM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hi all,
I'm going to test using 3D printed Kort nozzles on Shackleton, and I have an interesting unknown. It would be nice to print them solid, but it would just take too long and probably create shrinkage issues. So the question is, what fill percent suffices (in 3D printing you get to specify the percentage of material fill, the rest being air). I called Greg Cottrell and he didn't have any data on prints, but he did have some on the depth rating of different types of buoyancy foam.I did a napkin calculation and it would appear that, at least if the print behaves like foam of similar density, I'm fine. But does anyone have any data on this? Or does anyone have a small pressure test chamber for which we might print some test samples? I would need to test to about 500 psi.
BTW I've updated Shackleton's project page: http://www.psubs.org/projects/1234567810/shackleton/


Thanks,
Alec
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