[PSUBS-MAILIST] measuring an angle issue

[Alan via Personal_Submersibles]

Hank,
I would clamp 2 straight edges on to the face of the seat & measure off
the point they intersect, but a 1/4 of a degree might be tricky.
Can you bed the view port seats in with abrasive paste or anything like that
just in case you are a tiny bit out?
Wonder how good this is if you placed it top dead centre. Then double checked
It at bottom dead centre.


Alan

> On 27/06/2019, at 5:22 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Cliff,
> Thanks' probably the best idea.
> Hank
> 
> On Wednesday, June 26, 2019, 10:47:09 AM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> If it were me I would just calculate based on trig.  Before you bore out to 12" measure the depth difference between the inside and out side edges of the seat and call this a.  Measure the inside and outside diameters before boring and designate b as the difference in diameters /2.  Angle would be arctan (a/b).
> 
> Cliff
> 
> On Wednesday, June 26, 2019, 10:57:18 AM CDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi All,  I am planing to remove my original conical port and instal a dome on the original conical seat and bore the centre out of the original seat to get 12 inches of open view.  Will Cohen is making the dome for me.  My problem is, I have to measure the seat angle to within 1\4 of 1 degree.  How can I measure this angle without buying an expensive digital protractor?  I thought about just measuring the distances of the angles and just do the math, but it is pretty tricky to measure.
> Hank
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