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Trying to pre-plan a project and having mental problems

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1.8K views 8 replies 8 participants last post by  mojapitt  
#1 · (Edited by Moderator)
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!
 
#2 ·
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.
 
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#3 ·
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:
 
#5 ·
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.
 
#6 ·
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.
 
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