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I'm constructing an open octagon shape in which 5 sections of the octagon are being used. I have 22 1/2 degree angles so that my boards form the correct shape. Think of rectangles standing vertically and the long edges have the 22 1/2 degree angles.


Is there a way to make the joining surfaces mechanically secure by using a glue joint bit or a spline or biscuit? I can't figure out how to position the boards to achieve this.


Is there a way to make the joining surfaces mechanically secure by using a glue joint bit or a spline or biscuit? I can't figure out how to position the boards to achieve this.


- Mayo

South Elgin, IL111

Our Expert


Keeping 22.5 degree joints in alignment during gluing used to require a spline. And even with a spline the job was challenging because the splines added parts to the entire assembly.


A much easier solution is to use a bird's mouth joint. One half of the joint is square and the mating half is a "V" shape. The joint is very strong and, best of all, it is self-aligning. 


Amana Tool makes several router bits for bird's mouth joints including tool number 54270 which creates a 22.5.

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