Cutting Crown Molding on the Flat

Forget about inverted and backwards, just lay it on the board and cut it

New spare carpenters frequently ask how to cut crown molding with a miter go steady .
There is a set more to cutting and installing crown mold than there is to cutting and installing baseboard or any other mold that sits two-dimensional against the wall. Those cuts are planar .
Because crown determine bridges the ceiling/wall planes, the face of the model is not in plane with either surface .
And the cuts are even weirder.

Two ways to cut crown molding:

One way to cut crown molding it to use the 90 degree intersection of the table and fence on a miter joint see to play the contribution of wall and ceiling. When doing this, the fence plays the contribution of the wall and the mesa plays the partially of the ceiling .
So the crown molding sits top down on the understand. The see blade can be swing 45 degrees, and the blade will slice a perfect compound miter in the crown .
The other way to cut the crown molding it to lay it flat on the table and use the bevel adjustments of the blade to dial in the decline compound miter angles. To cut this direction, you need to know the spring angle of the crown shape and the bevel .

Critical crown molding definitions

give an·gle | leap ˈaNGɡəl ( noun )
“ The fish between the back of the molding and the wall, when the mold is installed. ”
—Gary Katz in Spring Angles and Angle Finders​

The main spring angles are 45/45 and 52/38, corresponding with the lead and bed angles on the crown molding, respectively .
To find out what the leap slant is, set the crown mold into the fork of a frame square and check where the ends align. if both numbers are the same, it is 45/45 crown. If the numbers are different, such as three inches on the wall and two inches on the ceiling, it is 52/38 crown .

bev·el |ˈbevəl (noun)

“ The angle which one surface of a soundbox makes with another surface when they are not at right angles. ”
—Dictionary of Architecture and Construction, McGraw Hill

Tilt the blade to cut the bevel .

mi·ter |ˈmīdər (noun)

“ A joint made between two pieces of woodwind or early material at an slant of 90 degrees such that the line of junction bisects this angle. ”

—The New Oxford American Dictionary

Swing the table to cut the miter .
To find the right bevel and miter angles use a big chart, like the one here, at GaryKatz.com, or use a smaller chart, such as this one, which was laminated for jobsite function by a carpenter named Bruce Abernathy :
Chart of bevel and miter angles for how to cut crown molding flat

Some miter proverb besides have charts built right in to them, such as the chart on this Bosch miter saw showing how to cut crown molding on the flat vitamin a well as “ inverted, and backwards ” :
Crown molding angle chart from Bosch miter saw

 

A few tips for cutting crown molding with a miter saw:

Make a match of sample pieces—a pair of at heart and a pair of outside corners. Use these samples to check the angles against reality, and to help you visualize the modeling in seat, when you are standing at the meet trying to remember which manner is up .
When cutting from an at heart to outside corner, Paul recommends cutting the inside corner first because it is easy to hook the end of the cut with a record standard to mark the future cut .
When measuring short point to short point, such as for outside to outside corners, you can do one of two things :

  • Burn an inch and subtract from your measurement, which works well for short pieces.
  • Clamp a speed square to the crown molding aligned with the short point and hook the speed square with your tape.

Man with tape measure and speed square describing how to cut crown molding flat
Align the sword with the edge of the line and cut. Do not cut the note, leave it .
Test drive the piece to make certain it fits, with the lineage left, you should be able to trim it into placement if needed .
There is a distribute more to hanging crown molding than this short introduction, but we will leave it there for immediately.

—Paul Ricalde is a home improvement contractor and fireman in New Orleans, LA. His YouTube channel is rich with construction/remodeling videos .

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