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A design / build residential and light commercial construction company.
CL # 769640 General B / HIC
Using the charts
The compound angle when cutting crown on flat varies with the spring angle of the molding that you are going to be using, ( Finding the spring angle was explained on the basics page). Not only will you have to keep track of the bevel and miter on the saw you'll need to know which side of the crown to put against the fence when you cut the corner. Also have a look at the step by step crown mantel example page, for more images when cutting crown on flat
Type of crown
Owner Tutorials - How to install crown moulding
Owner Tutorials cutting crown flat
Figuring out the angles on the miter saw's table
Click on the image to the right for a larger picture with the explanation and the settings, this simplifies reading the table on the miter saw for compound cuts when cutting in crown moulding in the flat position.
A protractor to find the angles, click on image for full size then right click and print or a PDF right
How do I determine the angles?
Enlarge Image for an alternative explanation
Above is a link to our 2 pages of crown molding charts with a "word" download you can print out for on the job.
The most common spring angles in the U.S. are 45/45 and 52/38
For Example you have a cabinets that meet on a 45 degree joint, half of that for the "in position cutting" method is simple.
That would be a little different when looking it up on the chart, look at the protractor here:
How do I Cut crown molding on flat?
to download a file for you to print out.
You see how 135 is the actual 45 degree on a miter saw?
Now you always miter half of the angle, so the 45 or 22.5 is actually a 67.5 look at the miter table above. Since you've used your protractor to determine the full angle as 135 you divide that in half to get 67.5 degrees... now open this chart:
This is a 52/38 spring angle chart, now look down for 135 degrees. The BEVEL is 17.6 and the MITER 14.3 so for the crown on top of your cabinet where they meet typically that would be the cut on flat.
That is why you'll won't find crown molding charts that go below 60 degrees, the crown can't be cut to that angle it's too sharp for an inside corner, the compund angles meet before the full length of the miter/bevel.
The best protractor for cutting in position if you are just starting out, the angle is in black and it gives you the miter in red.
First you need to determine if you have true corners in your building.
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That is what makes the
The best protractor for cutting on flat. If you decide to go that route it will pay for itself by saving you time with the automatic digital compound angle finder
< Click on these three images for larger pictures >
Just put in your wall and spring angles and press "calculate"
Bevel & Miter Calculator for Cutting on Flat
The Trojan MS-2000 Miter Saw Stand