[PSUBS-MAILIST] conical port angle

[hank pronk via Personal_Submersibles]

With a conical window with a tD ratio of .5 or less it is important to  have the gap at the high pressure side of the window.  My window is tD .5  so the gap I have at the outer edge is allowed .  I had the window seated (cast in place) as suggested by Karl Stanley, but I have since decided to go with acrylic on steel.  I plan to have an ideal fit but that may prove too difficult.  That is why I need to confirm my calculation, just to be sure I end up within the .25 degrees.Hank 

    On Thursday, July 14, 2016 6:17 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Given those tolerances, the window will seat at the outer diameter / face first, so zero conical clearance there, with the gap at the inner diameter. This will depend on the window thickness.Sean


On July 14, 2016 6:01:40 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi Sean,Yes that is what I am talking about, I realize that, and thought is was to big.  I want to know if I am calculating the gap correctly.  I have a .005in  gap at the moment but have not polished the seat or lapped it in.   By my calculations .25 degrees is .03in and that seems large also.  That is why I askHank 

    On Thursday, July 14, 2016 5:33 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hank - are you talking about a conical frustum viewport / seat combination? If so, two degrees is too loose.  Major diameter of the window should be machined to +0.000/-0.002 *Do (nominal outer diameter), and the included conical angle within +0.25/-0.000 degrees of the nominal value. The included conical angle of the window seat should be within +0.000/-0.25 degrees of the nominal angle.Sean


On July 14, 2016 5:01:48 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi All, Help!I am allowed up to 2 degrees angular mismatch between the port and the seat.  The conical bearing surface is 4.875 inches and I want to know how large the gap can be at the outer circumference of the port with a 2 degree mismatch.    Hank
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