How to install Crown
How to install Crown
A web site for understanding and cutting the compound angles for Crown Molding and cornice mouldings
Cutting Crown on flat
Solution: Cut the crown molding on flat!
Problem : Crown is too large position cutting.

"On flat"  you use the miter and bevel settings on your saw with the crown laying flat you then cut using those compound angles. 
Example: If it's an 80 degree corner and you have a 45 spring angle, you then set the miter at 40.12 deg. and the bevel at 32.80 deg.
Tip: Real world angles don't match miter saw angles so get a chart or a protractor that will convert those angles for you like the Bosch digital protractor.

hich way, in position or on flat , you ask?

If you shop online please use our links to amazon sometime in the future, (it helps me keep this tutorial free). Thank-you -Gordon-


Refer to the BASICS page to determine your spring angle we will use a 45 ° spring angle for this tutorial.


For outside left and the inside right miters you place the botttom of the crown to the fence and swing the miter to the left


45° Sprung crown needs a BEVEL setting of 30 degrees
and a Miter setting of 35.26 degrees.


Determine your corner angle, here we are going to use inside 90 degree and outside 270 degree wall corners.


For outside right and the inside left miters you place the top of the crown to the fence and swing the miter to the right

Crown Moulding "on flat" bevel and miter table
go here for our printable charts or here for our angle generator 

it in action [Flash]


For the left side
Bottom to the fence

For the right side
Top to the fence


For the right side
Bottom to the fence

For the left side
Top to the fence

This is a  NEW  protractor by Starret for crown.  It incudes tables! (Review coming soon)

The Good: Cutting crown on flat is a more precise, since it can be held straight on the miter saw easier. Large crown may have to be cut on flat. If you are a beginner start out with in position cutting.
The Bad: You will use crown tables, or the Bosch digital protractor that will calculate the compound angles for you.  Sometimes the measure mark is against the fence and harder to see. 

The ugly: You either have to flip the crown, or move the bevel (flip if you can that keeps the bevel constant) and remembering which way to the fence the top or bottom then which side to cut and keep can get mind boggling when you have all of the angles and lengths going on too.  Even if you are a pro you'll need visual references nearby for the first few times cutting this way.

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Thanks for helping!



This page last modified on Sunday, March 09, 2008

The most common spring angles in the U.S. are 45/45 and 52/38.

Two options that will calculate the compound miters from the spring angle for on-site work when cutting flat.

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