As a beginner, and gathering all info on different angles and degrees and having to subtract from 180 and dividing I came across a simple approach, works for me.
put your front rotation guide at exact zero.
now on the left side of rotation wheel scribe, paint, a line at the 90 degree mark.
take note the numbers in degrees to the top and bottom of the 90 mark, 75,60,45, this is your new scale, so if you want a 120 angle cut take 120 divide by 2 and your cut will be 60 and 60, a 110 will be 55 and 55, etc etc.
put your front rotation guide at exact zero.
now on the left side of rotation wheel scribe, paint, a line at the 90 degree mark.
take note the numbers in degrees to the top and bottom of the 90 mark, 75,60,45, this is your new scale, so if you want a 120 angle cut take 120 divide by 2 and your cut will be 60 and 60, a 110 will be 55 and 55, etc etc.
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