1. ## Wooden Octagons

How do I cut out wooden octagons?

I have a chop saw and table saw to work with.

I want each octagon side equal. I want the octagon cut out of a piece of 3 3/4"W x 3 3/4"H wood.

Do I cut the diagonal sides at 45 degrees or something else?

How do I map it out?

If I can get the octagon cut, can't I use that to make more? As in, using it for a template for later use.

2. you need to make 67.5 degrees cuts with the tablesaw in both sides of the wood when you assemble them you get an octagon.

3. Originally Posted by rriveraz_mty
you need to make 67.5 degrees cuts with the tablesaw in both sides of the wood when you assemble them you get an octagon.
I don't want to assemble them, I want a one piece octagon and then use that piece as a template for subsequent octagons. So do I set the saw at 67.5 anyway? I would assume that using a miter saw is better suited for cutting them out?

I have 3 3/4" squares to work with here, just trying to figure out how to make the squares into octagons.

4. Oh and just for an example of what I'm talking about, the following picture will illustrate what I'll be using them for. The octagon is not equal on all sides however. I want to get them that way...these were cut at 45 degrees (er...the diagonal cut). I have 4 sides equal and 4 sides that are too long.

5. test

6. see file

7. I can draw the octagon smaller if you want

8. On a 3.75 inch square, mark 1.1 inches from each corner and clip the corners to the marks. That will cut the original sides to 3.75-1.1-1.1=1.55 and the clipped corner sides will be of length 1.1*1.414...=1.555.. (If you really care, you could cut to 1.098 inches instead to get closer to equilateral, but wood usually can't hold that kind of precision.)

9. I guess maybe I'm not making myself clear enough, I apologize.

I don't need to know how to make an octagon. I need to know how to cut an octagon out of wood. What degree angle do I need, what dimensions, etc.

What is 1.1 inches? There is no "point" anything on any rule I have.

10. Originally Posted by Skullcrafts
I guess maybe I'm not making myself clear enough, I apologize.

I don't need to know how to make an octagon. I need to know how to cut an octagon out of wood. What degree angle do I need, what dimensions, etc.

What is 1.1 inches? There is no "point" anything on any rule I have.
1.1 is between 1 1/8 and 1 3/32 you'll probably be ok using either of those depending on your tolerances.

The side length of the octagon will be 1 9/16, so if you have a combination square (or other similar tool) that you can slide along the corner till a 45 degree line has that length, then mark and cut.

11. .1 = ~13/128"

Page 1 of 2 12 Last