Hi
I want to put crown molding up in a room that has a bay window and also has odd angles to deal with I have done coping joints and inside and outside 90 degree angles but just as an example how do you do a 38 or 42 degree angle for an inside angle. Hope someone can help
Thanks
Replies
Same way. If for a 90 you cut the 45 and back cut it, for a 42 you cut the angle at 21 and back cut - but you have to back cut farther for the mating piece to slip in behind. Your first attempt probably wont, but set the pieces upside down on the work table and look at where its hitting. You can rasp / file bumps out of the back pretty easily.
Just think in terms of the angle cut and the back cut having to equal or exceed 90. a 45 and a 45 back makes 90. For a 21, thats a steep back cut. (70 deg) Some would recommend, and you might want to try mitering them. I don't prefer to do that, but it is another option if you're careful with the fit.
"Sometimes when I consider what tremendous consequences come from little things, I am tempted to think -- there are no little things" - Bruce Barton
http://www.dewalt.com/us/articles/article.asp?ID=2
about two thirds down the page there is a sheet that breaks down the cut angle for odd wall angles
heres an easy way and you don't need to know/mess with the exact angle. tale your good 'ol adjustable angle square and stick it in or around (inside or outside corner) the angle. put the handle side against the edge of a board I usually use my mitre saw bench, (but it can get crowded)/scribe the angle on the board. with a scrap, scribe a line parallel to the edge of the board, then with the same scrap, scribe a line parallel to your scribed angle line. see how you have a parallelogram? (the edge of the board is one side). re-set your angle sq. to connect either the short diagonal or the long points(for inside or outside corners). upside down and backwards. set saw angle to that angle and go for it. Jim Devier
This is where your high school geometry is going to be applied....FINALLY!!!
If you already know the exact angles of the intersecting walls, great.....just bisect to determine angle cuts. If you're unsure of the angles, a bevel square comes in quite handy. (Inexpensive and readily available at your local hardware store or big box.) Use this tool to determine the wall angles, and then bisect to determine your miters.
I prefer to cope joints for crown mouldings, but on occasion when peices are short enough to handle, I'll miter them and preassemle prior to installing. Helps to keep them tight, as often just nailing individual pieces can open the joint.
Best of luck....feel free to stop in for more pointers.
J. D. Reynolds
Home Improvements