Bay Windows And Crown Molding

brwvabellNovember 1, 2008

I Know that this subject, (crown molding) is a Horrible, scrape your fingernails on a blackboard, tear your hair out kind of subject and .. I am sorry for bringing it up but, "I need help"!

I have installed crown in my master bedroom and in my dining room.

Believe me, I learned the hard and expensive way of doing it. (Lots of scrap and Lots of money to replace that scrap)

I actually did those rooms using one of those old fashioned miter boxes that uses one of those .. backsaws .. powered By Hand!

After all of that, I just went out and purchased a Dewalt, double bevel, compound miter saw!! (YES!!)

Here is my problem: I can do inside and outside corners but, in the room that I want to tackle now, I have a bay window.

The Dewalt does a great job with the inside/outside corners but I Have No Idea and can't find the info anywhere about miters for bay windows.

I know the angle in degrees of the actual wall, (44 and 46 degrees per inside angles) but I don't know how to translate that to the saw as to bevel and miter?

Just spent hours and as you know .. Lots of money on wasted material trying to solve this problem on my own.

Well, Here I am, asking for your help. LOL

I am So Upset!

You'd think that once you have succeeded in doing two whole rooms .. a little thing like a bay window would be a snap .. It Ain't!

Yes, I am a lady but that doesn't mean that I can't learn to do this.

My other rooms look fantastic but .. alas .. No bay windows there. 8-)

Thank You All,


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When I do crown, I do "upside down and backwards." This way, you don't need a compound setting. Just set your saw to the angle you need.

Pretend the base is the ceiling and the fence is the wall.

In addition to being simpler, it means you only have one setting per cut, not two, thus dramatically decreasing the chance for error.

    Bookmark   November 1, 2008 at 9:09PM
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Try the link below... if your spring angle is 45 degrees, then the miter setting will be around 16.5 degrees and the bevel about 15.5 degrees.

Here is a link that might be useful: Crown molding table

    Bookmark   November 1, 2008 at 9:10PM
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Your a Dear Man but ..
I have to disagree with your assesment of easy and hard.

I went through the upside down and backwards stuff and .. I did it all on a manual miter box.

Today, right after I bought the compound miter saw .. I cut .. Oh, let me think, Oh yes, I cut Twelve inside and outside crown moldings that will fit perfectly in two other rooms that I want to do.
THAT .. Even though I now know how to do those easy cuts would have taken me .. at least 8 to 9 hours to do ..
I did them on the Dewalt in less than 30 minutes.
Oh yes .. I did the cuts without all of that .. Upside Down and Backwards .. Bog The Mind, Into Insanity stuff.

    Bookmark   November 1, 2008 at 10:18PM
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If you scroll down the page linked below, you will find a table of compound angles to cut for any corner; If it's a 45* bay, the angles are 135* instead of 90*. This is a page from the DeWalt website, BTW.

Here is a link that might be useful: Crown Mold. Miter spreadsheet

    Bookmark   November 2, 2008 at 12:39PM
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Just saying it works best for me. I set up for spring angle and only have to move the saw between L & R 45 degrees, rather than get two angles right (even though my saw has stops for the common spring angles and I used to teach college trig and calculus).

If you have no problem doing it your way (and I presume you are not alone because there are compound miter saws), that's fine.

Here is a link that might be useful:

    Bookmark   November 2, 2008 at 3:34PM
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