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Old 11-27-2015, 07:34 PM   #1
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(Easy) Finding the correct angle ...?


So ... I'm making a huge chair for my parents pool room and I want to make the front of the chair wider than the back (by a little bit). I just forgot hot to find the angle that I need to cut all diagonal pieces at so they would be flat on the back/front legs. (I am making it out of 4 by 4s ... its going to be beefy.)

Measurements:
(Excluding the legs)
Back=18"
Front=21"
The other measurements don't have to due with the angle.

I know this is simple but i seemed to have forgot how to figure out the angle I need. Thanks!

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Old 11-28-2015, 04:11 AM   #2
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There is another measurement that affects the angle: the depth. Drawing is exaggerated to illustrate the point.
(Easy) Finding the correct angle ...?-angles.png

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Last edited by GrayHair; 11-28-2015 at 04:13 AM.
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Old 11-28-2015, 07:57 AM   #3
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And the really old way is to lay it out on a the floor or a table and scribe the lines, cut a piece of scrap and see if it fits.
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Old 11-28-2015, 10:01 AM   #4
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No reply yet, so I'll just post a formula.
(Easy) Finding the correct angle ...?-calcangle.png
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Old 11-28-2015, 11:38 AM   #5
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Thanks Mithrandir !

Sorry for leaving out the other measurement, so with

Back=18"
Front=21"
Depth=18"

Following your formula this is what I get.

4.76= tan^(-1) (1.5/18)

So basically its 4.8 degrees ?
So I line that up in an angle square and I should be good to go right ?

Thanks again!
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Old 11-28-2015, 12:15 PM   #6
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I also get 4.76.

OBTW: That 18 between the front and back should be the inside-to-inside measurement as shown by X below. If you don't add some length to the front, you'll loose it off the back (see blue line).
Name:  aNGLES.png
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Any mention of codes is based on NFPA 70 and/or 72, as applicable, because they are the most widely adopted codes in the US. Local amendments may modify the code adopted in your area, so consult your local codes official.

Last edited by GrayHair; 11-28-2015 at 12:22 PM.
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Old 11-28-2015, 11:10 PM   #7
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That's a good point I never thought of that. Thanks again for everything !!!
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Old 11-29-2015, 09:01 AM   #8
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I didn't think of it either, until after I had posted. The Oh By The Way and graphic was an Edit. I saw no way to add the graphic in the basic Edit screen and had to Go Advanced; where there was no Reason for Edit box. Anyway, you saw it and that's what counts.

Don't forget pictures of, at least, your completed project.

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