120 angle needed

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Forum topic by JennaHammy posted 11-07-2013 06:06 PM 958 views 0 times favorited 5 replies Add to Favorites Watch
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1 post in 1701 days

11-07-2013 06:06 PM

Topic tags/keywords: angle joint shelf


I am making hexagon shelves in my carpentry class. Since the hexagon is being formed by butt joints my instructor wants me to add stability to the shelf by adding a piece at the angle (120) for each corner angle. I have access to all of the tools in the shop, however, we cannot figure out how to achieve a 120 degree angle that fits and is flat on the outer edge. Please let me know what you think. The picture is an example, not my project. Thanks.


5 replies so far

View HorizontalMike's profile


7758 posts in 2937 days

#1 posted 11-07-2013 06:14 PM

Take the radius of a desired circle, and using a compass start at the outside diameter and trace the intersecting points that the compass touches along the diameter. Then move the point of the compass to the next adjoining mark and do the same thing. You only use just the one radius for all marks. This will give you 120-degree marks, and more than you need elsewhere, but you get the idea. Then all you do is trace that angle through the center point for a template.

This is how I got my hex sign design on my 6-board chest.

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-- HorizontalMike -- "Woodpeckers understand..."

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418 posts in 1751 days

#2 posted 11-07-2013 07:32 PM

I don’t see a picture.
How long does your pc have to be? Also, how Big?

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418 posts in 1751 days

#3 posted 11-07-2013 07:41 PM

Anything like this??

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Fred Hargis

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#4 posted 11-07-2013 07:44 PM

Kevin’s approach is how I would do it.

-- Our village hasn't lost it's idiot, he was elected to congress.

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7992 posts in 2821 days

#5 posted 11-07-2013 08:05 PM

I’d do it with a birds mouth. It’s more elegant but unfortunately, not what the teacher asked for.

You set the table saw at 60 degrees and run one side through first on edge, then on flat and you’re done.
It makes a great hexagon, can be clamped with a bungee cord and can even be tapered.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

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