How do you figure this??? - Page 3 - Router Forums
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post #21 of 22 (permalink) Old 04-04-2018, 05:32 PM
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Cherryville Chuck's Avatar
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Any angle is just a product of the rise and run. The sine function is the height of the rise/ the length of the hypotenuse. It really isn't hard and a calculator will do the work for you. You can calculate the sine using the lengths and then use the inverse sine function to find the angle. (Divide height by length of the hypotenuse; click the "INV" button then the "sin to the -1" button).

This can be handy to know. When you are building a roof you should work in rise and run, typically a 4' rise for every 12' of run or a 4 in 12 pitch. But if you are angling the ends with a chop saw you need to know the angle. The hypotenuse (the length of the slope) is the square root of (4 squared + 12 squared) which = 12.65 . 4/12.65= .316 which is the sine value. The angle, the inverse sine, is approximately 18.4 degrees.

The unfortunate part of the way our schools teach math is that they don't show you how to apply it to everyday problems because if they had I think way more of us would have learned it and remembered it.
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Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.

Last edited by Cherryville Chuck; 04-04-2018 at 05:34 PM.
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post #22 of 22 (permalink) Old 04-04-2018, 07:36 PM
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Or you could learn how to use a framing square. Itís amazing the things people have made without the use of trigonometry or graph paper. A framing square was a carpenterís calculator and could be used for calculating many things.

In woodworking there is always more then one way to accomplish something.
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