Reply by EricTwice

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Posted on Need some math help

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248 posts in 1410 days

#1 posted 05-19-2017 11:08 AM

The interior angles of a pentagon are 108 degrees and they are mitered at 54 degrees.

A problem arises with the the angle of the faces to each other I believe this is called the dihedral angle and is 116.56 degrees. (check me on this) It is critical. You don’t have to miter it, you just have to have it in the exact middle at the top of your stock for your frames to line up properly. You will miter stock upside down. This way when you cut the miters right and left, the space for the third side automatically happens.

(this keeps you from having to figure out the compound miter.)

You should be able set up a jig and get all your pieces right and the same. Make lots of extra stock you will burn through it getting your angles correct.

once you have the angles solved, you will need to have some kind of joinery in the miter so they will stay together.

Looks like a fun project

-- nice recovery, They should pay extra for that mistake, Eric E.

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