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Forum topic by cassady posted 720 days ago 609 views 0 times favorited 8 replies Add to Favorites Watch
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cassady

16 posts in 1035 days


720 days ago

I am trying to plan a project that will eventually be an octagonally-shaped cart for my air compressor. I have the plan in my head but I apparently lack the brainpower necessary to figure out how to join the pieces of wood AND also figure out the angle I will need to cut the wood at to form the octagon. Picture an octogon about 2 feet across. If anyone has a tip for figuring angles and then also knows a good way to clamp angled joints, feel free to school me!

Thank you!

-- Cassady in Denver, CO


8 replies so far

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DIYaholic

13271 posts in 1302 days


#1 posted 720 days ago

Doing the math for the angles wood hurt my brain right now…...
Clamping could be accomplished with a band clamp. Like this one on sale at Rockler.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procratination a bad thing?

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Ryan Haasen

362 posts in 1028 days


#2 posted 720 days ago

Matthias Wandel has a video about how to calculate the angles for a polygon (10 sides). While that part may not be such a great help, he also shows how he glues the angles joints together. Here’s the link, hope it helps: http://www.youtube.com/watch?v=_CRJsn_pQ7Q&feature=relmfu

-- Ryan

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casual1carpenter

353 posts in 1102 days


#3 posted 720 days ago

cassady, this might help if I have the tolerances set right lol.

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tomd

1738 posts in 2397 days


#4 posted 720 days ago

Just do a Google search for a segmented angle chart. An 8 sided ring will need and angle of 22.5 degrees on the end of every piece. To clamp them, form the ring with all sides in their place, glue then rap a band aroung it making sure its flat an in an even octogon shape, I use a large rubber band or belt clamp. After it dries screws or splines can reinforce the joints.

-- Tom D

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Howie

2656 posts in 1550 days


#5 posted 720 days ago

360 degree circle-divide by 8 = 45-divide by 2 = 22.5 like tomd said. Key is dividing the circle by the number of sides.
I would use bisquits for alignment and a good glue along with a strap clamp or some type of rubber band. I buy surgical tubing at Lowes and it works great for rubber banding odd shapes.

-- Life is good.

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helluvawreck

15582 posts in 1493 days


#6 posted 720 days ago

A really good program for a woodworker to have is a CAD program. It makes anything like this easy. A really good affordable CAD program is Turbocad.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

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cassady

16 posts in 1035 days


#7 posted 719 days ago

Thanks for the info everyone! Appreciate the sharing

-- Cassady in Denver, CO

View Monte Pittman's profile

Monte Pittman

13741 posts in 965 days


#8 posted 719 days ago

8 pieces (obviously). Diameter X π (3.14) divided by 8 that’s the length of the pieces. All angles are 22.5 degrees. I build a lot of octogons.

-- Mother Nature created it, I just assemble it. - It's not ability that we often lack, but the patience to use our ability

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