Coping and 120 degree angle

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Old 04-12-16, 05:39 AM
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Coping and 120 degree angle

New to coping. I read that you first cut with a power saw after measuring an angle.What angle do you use if the measured angle is over 90 degrees. The angle is about 120-130 degrees. This will be crown molding for ceiling.Don't remember my math and angles.
 
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Old 04-12-16, 06:42 AM
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You can start with a 45. Follow the front edge of the cut as you cope. You just need to back cut it more for a 120. Same as coping a 90 but you back cut it an add'l 30 degrees. A grinder with a flap sanding disk is practically a must have for coping crown.
 
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Old 04-12-16, 07:03 AM
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Angle

120 / 2 = 60. Use half the obtuse angle.
 
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Old 04-12-16, 07:14 AM
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I highly doubt he has a miter saw that can make a 60 degree miter. As I mentioned, its not the miter you make that matters... its the amount of wood you remove when coping. Cutting a miter just gives you a line to follow on the front of the profile.
 
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Old 04-12-16, 10:07 AM
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Profile

Would not the profile change as the angle changes?
 
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