what are the angles to cut crown molding on a 120 degree inside and outside corners?

Answer 1

First off, look around at this web page and learn as much about the task at hand as you can.

http://www.josephfusco.org/Articles/Crown_Moulding/cuttingcrownpg1.htm

This is a tricky situation because most miter saws either do not go to 60 degrees at all, or if they do they only do it on the right side. Also, in most instances, the angle is not exactly what it appears to be because of deviations caused by checking lumber, drywall mud build up or just plain house settling.

It is always helpful to tackle this kind of trim project with a 10 inch slide compound miter saw or a 14 inch compound miter saw. The main reason why you want a compound miter saw is because you can tilt the blade as well as change the miter angle. It is always hepful to use a block plane too so you can tweek the pieces to tighten up that seam.

For the inside angle, you will probably get far better results if you cut a 60 degree angle on the first piece and butt it to the perpindicular wall and then cope the second piece over the top of the first piece. When done correctly, it will appear to be an inside miter. Additional tools required for this will be a coping saw and perhaps some sandpaper.

For the outside angle, you may be better off perfecting this by starting with some scrap pieces and using the trial and error method of experiamentation. Becuse the miter saw is usually not designed for cutting a 60 degree miter, you might find that you will have to cut one side with the miter angle and the other side with a tilted blade.

Another alternative might be to use a third piece of trim and wrap that corner by breaking the saw cuts down to 30 degrees and step the trim half way on one wall and half way on the other wall and fill in the gap with a narrow piece. I am visualizing this in my mind, but without actually trying this out, I am not sure if this will even work.

Hang in there. It is possible to do this.

Answer 2

Cutting Crown Molding Outside Corners

Answer 3

A 90 degree corner is going to be 32 degrees angle and 32 degrees bevel take a couple of short pieces and start there. Hold them up on the corner and if they dont work start to increase the angle (the turntable) by one degree at a time. Its allot of up and down on a ladder but it will work

Answer 4

It depends on the molding. If the angles between the walls are 120 and your molding is 52/38 degree the miter would be 19.57 and bevel at 23.20. If your molding is 45/45 degree the miter would be 22.21 and bevel at 20.70. Try scraps first and tune it because your walls determine the true angles. If it is paint grade you always have caulk.

Answer 5

chicagogirl and woodtick gave you the right answers,,, the video is also of some benefit,,, perhaps you should consider using the two sources keep in mind though, what you are doing will always look wrong and completely backwards for mitering crown moulding corners it's also beneficial to allow an extra 1/8th of an inch for trimming and re-cutting until you get the hang of the process

Answer 6

It's not as simple as "A,B,C." most carpenters can't do this without checking prior knowledge. Do you have the proper tools? You can buy these premade angles at Home Depot to make the job easier.
These are one of the hardest angle cuts to make, if all your wall angles and ceiling angles are correct, most aren't and throw the job off.

Answer 7

If you are putting two pieces of trim together on a seam, then the cut is merely half of the angle.

90 degrees = 45

45 degrees = 22.5

120 = 60

Answer 8

Try this chart, you will need to know what angle your moulding sits at.(Eg. 38, 45)
http://www.josephfusco.org/Articles/Crown_Moulding/CrownChart.html

Answer 9

a 33?