[PSUBS-MAILIST] conical port angle

[Sean T. Stevenson via Personal_Submersibles]

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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