Saw ceiling moldings more than 90-degree corners, how do you do it?

[sereman]

Hi! Now I have cut almost all the ceiling moldings that are 90-degree angles (45 on the saw), and I have the most difficult wall left in the living room, which has corners greater than 90 degrees, maybe 120 degrees. How do you do it? Grateful for all responses so the wife will be satisfied when the moldings are finally done

 

[Stefan N]

Sneak angle? Do you have a baseboard in the ceiling?

 

[hantverkare1]

Looks like a skirting board.

 

[pelpet]

If you place the plank on its edge in the saw, you can cut angles greater than 45 degrees.

I would have left the baseboards in the ceiling and kept quiet about it, no one will notice.

 

[mattiasp]

If it is 120 degrees, you should set the saw to 30 degrees. The formula is 90-angle/2.
And I can't see that crown molding as a baseboard would be wrong. If it looks nice, then it's fine, right? Baseboards are usually easier to make look nice in corners than, for example, traditional moldings.

 

[M.Kristensen]

120/2 = 60 degrees

 

[Hedenhö]

120/2 = 60 degrees

Old thread... but.
120/2=60
90-60=30
That is the formula for miters over 90°
Everything below is divided by 2

 

[mattiasp]

Old thread... but.
120/2=60
90-60=30
That is the formula for angles over 90°
Everything below is divided by 2

No. I already wrote the correct formula in post #5, November 2014. It applies to all angles, as long as the angle is defined as the angle made in the space outside the wall. Assume it's an outside corner, then the angle is 270°. 90-270/2= -45°. I see no good reason to revive a 5-year-old thread to provide confusing information.

 

[Andreas Kneg]

Hello

I have the same problem but don't understand the formula. It's an inner corner that is maybe 120-130 degrees "open." How should I cut the two pieces on the miter saw to get them to fit together? The setting goes up to just over 45 if I remember correctly.

 

[Utsliten och utdömd]

Hello

I have the same problem but don't understand the formula. It's an inner corner that is maybe 120-130 degrees "open." How should I cut the two pieces with the miter saw to fit them together? The setting goes up to just over 45 if I remember correctly.

(180-130)/2=25 degrees cut per strip

It's how much the angle is closed from straight (180-corner's angle) that you need to cut off. You then distribute that value on both pieces (/2)

 

[Andreas Kneg]

Aha, in my case the open angle in the inner corner is larger than 90, about 130. So then it will be about 25 per list since more wood needs to remain...

 

[Utsliten och utdömd]

Aha, in my case, the open angle in the inner corner is larger than 90, about 130. So then it will be about 25 per list since more wood needs to remain…

The same formula also works for a closed inner corner, e.g., 70 degrees

(180-70)/2 = 55

 

[Andreas Kneg]

Thank you