how to..... make an octagon - Woodworking Talk - Woodworkers Forum
 
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post #1 of 14 Old 03-22-2009, 08:59 PM Thread Starter
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how to..... make an octagon

I need an easy way to make an octagon that is symmetrical. I once had a copy of WOOD magazine that had an excellent way of making one with a compass. Does anyone happen to have this copy and share how to make an octagon? This copy of WOOD magazine is probably somewhere around the Aug. 08 issue. It also has a Walnut gun cabinet plans in the same issue. Any suggestions would be greatly appreciated.
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post #2 of 14 Old 03-22-2009, 09:12 PM
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Here's a quick tutorial:
A regular octagon is constructible with compass and straightedge. To do so, follow steps 1 through 18 of the animation, noting that the compass radius is not altered during steps 7 through 10.
.

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post #3 of 14 Old 03-22-2009, 09:27 PM Thread Starter
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Thanks Cabinetman. That is close to the way they talked about doing it, except they used a square to start off with rather than a circle. I also found out the the issue was from September of 08'.
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post #4 of 14 Old 03-23-2009, 03:15 AM
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Er, uh, you mean this
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post #5 of 14 Old 03-23-2009, 06:29 AM
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Quote:
Originally Posted by Garibaldi View Post
Er, uh, you mean this
Now that is really simple.

George
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post #6 of 14 Old 03-23-2009, 06:42 PM Thread Starter
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Quote:
Originally Posted by Garibaldi View Post
Er, uh, you mean this
That would be it..Thanks Garibaldi.
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post #7 of 14 Old 03-23-2009, 09:14 PM
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Use a compass to draw your circle. A circle is measured in 360 degrees.
Draw a straight line across true center. Measure and mark 40 degrees from your first line on the circle, then 40 degrees from that line and so on. Now draw a straight line from each intersection point around the circle. You should end out with what you want.
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post #8 of 14 Old 03-24-2009, 08:53 AM
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lol, i always do stuff the hard way. I would've just cut a rectangle template out of construction paper to the width that I wanted the hex to be, then trace it three times - each time rotated once.

...or four times for an octogon. :)
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post #9 of 14 Old 07-30-2011, 01:14 PM
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Octagon Layout

I know this is an old post, but if anyone else needs it you might also try:

http://www.htmliseasy.com/octagon_layout/
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post #10 of 14 Old 07-31-2011, 06:35 AM
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Theres a neat octagon "scale" on a framing square.BW

Those who say it cannot be done shouldn't interrupt the people doing it.
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post #11 of 14 Old 07-31-2011, 07:38 AM
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When I saw the thread title I was expecting to see discussion of a fight cages... Disappointments...

~tom ...it's better to remain silent and be thought a fool than to open one's mouth and remove all doubt...
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post #12 of 14 Old 09-25-2012, 09:27 PM
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Revisiting this old thread and thought I'd throw in one method for reference.

This is very simple but requires starting with precision.

  • Cut 2 perfect squares out of wood the size of your octagon. They have to be exactly square.
  • Mark the exact center of one of the boards and clamp them together flush along all of the edges.
  • Drive a screw through both boards at the center as a pivot point.
  • Turn one of the boards 45 degrees, using a combination square or other angle gauge.
  • Clamp the boards or drive another screw through them to keep them in the exact position.
Now you can draw your 45 degree cut lines or rough cut them off proud of the line and use a router with a flush trim bit.

A similar method is found here:

http://www.thomasjmacdonald.com/medi...?vid=4f93f8446
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post #13 of 14 Old 09-26-2012, 01:16 AM
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Quote:
Originally Posted by Garibaldi View Post
Er, uh, you mean this
This is the way I layed out a table, it worked great.
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post #14 of 14 Old 09-26-2012, 06:11 AM
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Or draw it in CAD.

"wood does not do well outside.....well....except for trees"
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