[PSUBS-MAILIST] measuring an angle issue

[hank pronk via Personal_Submersibles]

 Alan,I know the local machine shop owner pretty good, so I will ask him first.Hank
    On Wednesday, June 26, 2019, 6:04:26 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,It says resolution to .1 of a degree but accuracy to .3 of a degree.You need accuracy to .25. That model was made in North America.You will need to find out how long the tool needs to be & then lookat the advertised accuracy within the available items.Alternatively you could find out how long the tool needs to be & seeif any local machine shops have an instrument for measuring anglesof that length. Then you would have to tow your sub there causethey won't lend you their tool! ( unwritten law)Alan
On 27/06/2019, at 9:20 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


 Alan,I was looking at a digital protractor like the one you posted.  I wonder how accurate they are, I guess I could test against a known angle.Karl Stanley bed his ports in epoxy paint.  I prefer it to fit against the seat so it can creep properly.  Seating it might be possible also.Hank
    On Wednesday, June 26, 2019, 2:28:27 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,there are a lot of this style of digital angle finders at a reasonable price.but how long would it need to be to get the angle of your seat.Again put two straight edges on the seat & measure from the point theyintersect to find the length of the digital angle gauge required.Alan<image1.PNG>

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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