Installing crown molding at odd angles

[jspenn]

I have 2 inside joints and 1 outside joint at angles other than 45 deg. I have have tried cutting upside down and backward,with a stop installed to ho :twisted: ld the molding in place. This has not produced satisfactory results.
I would appreciate any advice on how to do this.

Jim
:?:
jspenn170@aol.com

[Rich]

Use the Crown Molding Calculator (http://www.construction-resource.com/crown_molding.php) on the site. Input the angle of the wall and the spring angle of the crown and then you can cut it on the flat. You will need to know the actual included angle between the walls - not the bisecting angle.

[grumpydasmurf]

Holy crap you have a crown modling calc also. Is it available in excell format? Last I looked that calculator wasn't there.

[Rich]

haha.. it's been there for quite awhile now. I may be able to put it into excel - it'll be about a 3 page formula.. haha. just kidding. I'll see what I can do.

[Rich]

Here you go Grumpy. It wasn't quite as difficult as I thought. It doesn't give you much but it works alright.
http://www.construction-resource.com/projects/CM-calc.xls

[jspenn]

Use the Crown Molding Calculator (http://www.construction-resource.com/crown_molding.php) on the site. Input the angle of the wall and the spring angle of the crown and then you can cut it on the flat. You will need to know the actual included angle between the walls - not the bisecting angle.

I attempted to use the calculator, but get an error message. Is it my computer that is the problem?

jspenn170@aul.com :roll:

[Rich]

Try and use the Excel file. The online version is made from javascript so you'll need to check the settings on your browser and see if it's enabled.

[jspenn]

I have tried to use the excel file, and checked that javascript is enabled. but still unable to get the calculator to work. could you send me the calculations for a 40 degree inside joint and 35 degree outside joint with 45/45 spring angle?

jspenn170@aol.com

[Rich]

For the 40 degree wall angle you will have -
62.76 Miter
41.64 Bevel
For 35 degree - either
65.97 Miter
42.41 Bevel
or
12.57 Miter
12.28 Bevel
I have either in there because I wasn't sure where you measured the angle from - if it was included or not included. You'll be able to tell which one fairly quickly as you are right there.
Hope that helps.

[nick62]

I have rounded corners in every room of my new house. It might add a nice look, but it has been a bear crowning 2 rooms to date.

I still have not figured out a way to determine what the hell those corner angles are .
It's been kinda of trial and error, which is not fun at all.

I checked some inside corners today with a protractor and they ran from 22 degrees to 44 degrees.

Does anyone have any thoughts.

i'm using 38/52, 7 3/8" wide.

[Rich]

So you're trying to figure just the angles for the corbels right? Not to miter the crown for the corners. Your crown will butt into the corbels.
Anyway... unless you can find a wide angle slide protractor that doesn't have the center pin.. then it probably will be trial and error. Anybody else seen any quick tricks for this?

[nick62]

Sorry to confuse you Rich.
It's really 2 different things, I'm trying to do better.
1. Figure out the miter angles of degrees to cut my molding on these rounded corners I have all over.
2. Is to be able to install some of these boxes (corbels) in corners other than 90 degree corners.
I have few corners that are anywhere near 90's

[Rich]

So the main thing is finding the angles first. By rounded I'm thinking of something like a 1" radius.
I would take 2 pieces of 2x4 or something like that. Lay against the walls to essentially fir them out to where you can get a square corner.. then take the measurement from that.
For the crown - setup just like you would a 90 degree cut (i.e. 45 miter) .. divide your angle in 2 and use that angle instead of the 45. That will take care of the crown molding other than scribing the bottom side to fit the rounded corners.
For the corbels I would do the same thing to figure out the angles - then lay the bottom of the corbel out just as if it was perfectly square. Divide the angle you have by 2 and mark that off the centerline (corner to corner) of the square piece. And then scribe the bottom of the corbel into the wall to account for the rounded part. Then build the sides to the bottom. I'll see if I can put together a couple drawings to show what I mean.

[Rich]

I was going to post this too
http://www.leevalley.com/wood/page.asp?page=32583&category=1,43513,43552&ccurrency=2&SID=

[nick62]

Here is a picture of those rounded corners.

[Rich]

Here's what I'm picturing.
Start is the wall as it stands right now. Finding angle is done by putting 2x4's on each side to get a point - use a angle finder, protractor, or as posted above.
Option 1 is if you want to have one side square to the wall and Option 2 is if both walls are out so you center half the angle. Finished would be after scribing to the wall. From there you apply your 2 sides for the corbel and install.
For the crown angles use the 2-2x4's to find the angle.
I'm probably being redundant here.. but it may benefit someone else :)

[russeller]

Hey Rich ... here is a slightly improved version of your spread sheet ...

[Rich]

Right on.. Did you have to put that Dewalt on there? Just kidding.

[Dragon]

I have 2 inside joints and 1 outside joint at angles other than 45 deg. I have have tried cutting upside down and backward,with a stop installed to ho :twisted: ld the molding in place. This has not produced satisfactory results.
I would appreciate any advice on how to do this.

Jim
:?:
jspenn170@aol.com

Buy a Bosch Miterfinder. It is a crown installers best friend and the best $120 you will ever spend.