Long Angle Cutting on a Miter Saw

A nice illustration in this thread shows how you can cut a 140-degree angle (for instance) on a chopsaw. June 17, 2010

Question
I need to cut a 140 degree bevel on my table saw but the saw only goes up to 45 degrees. I know itís possible to cut any degree on both table and miter saw, but how? Is there a mathematical conversion involved?

Forum Responses
(Cabinetmaking Forum)
From contributor K:
Try cutting 40 degrees from the other direction. Your table saw probably only tilts one direction. Make sense?



From contributor V:
Remember that with the scale on a saw, when the scale is set to zero the blade is at 90 degrees.


Click here for higher quality, full size image



From contributor V:
I forgot to add that although in the above illustration the angle between the saw table and the blade is 50 degrees, the saw scale would read 40 degrees. The reason is that when the saw is set normally, the blade has already traveled 90 degrees from the horizontal line of the saw top. That line can be seen as 180 degrees. 180 is said to be the number of degrees in a straight line. The saw blade cannot of course be set to completely horizontal or 180 degrees but is a point of reference with the blade. Since the blade is really 90 degrees but the scale reads zero to get to the 50 degrees you have to move the blade the difference of those two angles (90-50=40) so you let the saw scale move 40 degrees from its zero setting. To use the same logic on a chop saw, just consider the fence of the chop saw the same as the table saw top.

Also, if you consider the straight line of the face of the part shown to be 180 degrees, to arrive at the complimentary angle of 40 degrees in the first place just subtract your full angle (140 degrees) from the angle of the face of the part (180 degrees).