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I'm trying to install crown molding to hide a light I'm using for uplighting to provide indirect lighting in a stair well. A picture is attached. The longer side I envision against the wall, the shorter side out. The angle to get back to the wall is cut at a 45.



I'd like to attach crown molding around the outside to block the view of the light, and I need it to make the 45 degree angle as a corner. I've tried watching video's on youtube and I've tried to read the site installcrown.com but whenever I think I understand it I make some cuts and I'm left with nothing that works.

Using the calculator on the above site, I assume my wall angle is 112.5 (outside corner is 225 (180+45) and divide by 2)

spring angle of 52 (using it upside down to get a more favorable nailing edge and it still looks good

gives miter of 27.77 (28 for my sake)
bevel of 20 degrees.

I've made that cut and used up about 4 feet of cheap molding trying to figure it out and I can't.

Can someone please help me figure out what I'm doing wrong?

Thank you!
 

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if I am reading this correctly, try placing the crown upside down on the miter saw, with the fence acting like the wall. and make a cut that is 22.5 degrees. cut one end one direction, the mating board the other direction.

you will need to make sure the small flat of the crown is flat against the fence for a good cut.
 
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