Advice on how to figure out a dimension

[nukecad]

14 hours ago, steven-g said:

Have you tried???

No I hadn't.

Quote

(don't have CAD here but it's 1.625" if my triganometry brain is still working)

 

Obviously my trigonometry brain wasn't working properly, and I admit that I got the calculation wrong.

 

My apologies to all.

 

Not sure just where I went wrong (cotan instead or arctan on the calculator maybe?), I was expecting the dimension at the centreline to come out at a 'round' number and when I got 1.625 I thought 'bingo' and didn't double check it.

 

I agree that it should be 1.7321 as in eldons drawing.

The correct calculation is simple; 2.8146 - (0.625 * tan60) = 1.73206

(Now for my own curiosity/satisfaction I'm going to have to spend an hour or so trying to replicate just how I calculated it wrong).

 

It still seems strange to have the tube/pipe length dimensioned to 4 DPs when it isn't even positioned that accurately.

 

And PS. Now that I'm on my laptop I can also now see that second lug/hole in hidden detail on the sketch, must have been the resolution on the other device that wasn't showing it.