How To Cut An Octagon Roof

How to build an octagon on a miter saw.

How to cut an octagon roof.

Lay out your octagon on a flat surface. Very simple to use. The center piece is ripped at 3 3 4 in. Well the owner cut the octagon hips as if it were a normal hip rafter and of course the hip rafters didn t fit.

Chances are it will need adjustment as there likely will be miters that will not fit tightly together either on the short end or the long end of the. The download contains both a html version and a stand alone htmlhelp version. Subtract the 22 5 degrees from 90 and you get 67 5 degrees. The angle between the adjacent roof sections is then the angle between the vectors n 1 and n 2 and thus the angle of the cut will be half this angle.

For an octagon the calculated angle is 45 degrees and 22 5 degrees will be added or subtracted from each side of the stock. The sides are ripped at 3 3 4 in. It s written in html and javascript. Octagon gazebo roof scaled down model for rafter joint style illustration purposes.

To find the vectors i am going to impose a coordinate system with the origin at the initial point of v 1 and v 2 with v 1 along the x axis the y axis pointing into the page and the z axis vertical. Your table saw normally is set at 90 degrees or perpendicular to the top. I nail a pair of opposing common rafters to the ridge then swing the ridge up and fasten it into position. By 1 1 8 in then beveled at a 45 angle.

Htmlhelp version requires that internet explorer v4 or greater be present. Set your blade tilt to 67 5.