[PSUBS-MAILIST] ROV build video

[hank pronk via Personal_Submersibles]

 Rick, I am amazed also, but it is a small diameter and quite short.  Also the 0-ring seat is substantial compared to the thickness.Hank
    On Sunday, November 1, 2020, 11:20:55 AM MST, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 HankI am amazed that a 1/8" wall was able to take that pressure without deforming enough to allow the seals on the ends to not fail! Rick
On Sun, Nov 1, 2020 at 6:12 AM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Sean, I may do an anneal cycle because I have to machine the interior of the cylinder to accept the o-ring.  Also I machine the 1 inch thick port for the housing.  The tube will be cut shorter unless I need buoyancy.Hank
    On Sunday, November 1, 2020, 4:40:31 AM MST, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 
The failure pressure is governed by the wall thickness to diameter ratio, plus the end conditions (bulkheads) for buckling modes. Longer tubes will be less stable, so you want it just long enough to accommodate your camera.

I don't know what sort of condition your acrylic tubing comes in, but if you're cutting / machining it, I'd be inclined to anneal it if you can do so easily. Even if there is no issue with the hydrostatic pressure performance, annealing will give you a better chance of surviving an accidental impact when the tube is already stressed.

Sean

-------- Original Message --------
On Nov. 1, 2020, 04:25, hank pronk via Personal_Submersibles < personal_submersibles at psubs.org> wrote:


 David, I am just amazed how strong that acrylic is.  Of coarse the small diameter is critical.  The tube is 1\8 wall.Hank
    On Saturday, October 31, 2020, 11:51:32 PM MDT, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank, that's impressive.  How thick was the wall of the acrylic tube?David
On Sat, Oct 31, 2020, 4:25 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



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Pressure Testing Camera Housing For New ROV Project


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My new fly out ROV project.

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