Thread: What gives with this angle calc???
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Doug Miller[_2_] Doug Miller[_2_] is offline
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Default What gives with this angle calc???
In article , wrote:
The standard taper 3/4 inch per foot is listed in Machinery's Handbook
as 3, 34, 47. When I calculate it I get 3,34,34. I get this answer
using my TI calculator and my computer. Looking on the web I find the
3,34,47 answer. It's the angle I've always used. So how come I get
something different? On my TI-30X calculator I divide .75 by 12 which
equals .0625. This is the tangent. I then use the inverse tangent
function to get the answer: 3.576334375. Then I use the DDDMS
function which returns the answer: 3,34,34 80. So what's going
on??????

Book's wrong. Calculator's right.

You can verify this yourself:
3.576334375 degrees = 3 deg 0.576334375*60 min
= 3 deg 34.5800625 min
= 3 deg 34 min 0.5800625*60 sec
= 3 deg 34 min 34.8 sec
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