Setting Up the Jig
1. Before you pick up the jig, make a simple crosscut on your
saw to create a 2 foot long piece of your molding to be used as a
template throughout the job.
2. To begin setting up the jig, place your template
piece in the jig with the bottom edge up. This orientation is very
important. Every single cut you make is done with the bottom of the
molding closest to the blade. In English pubs, people drink toasts by
saying "Bottoms up!", which means they tilt they glasses until
the bottom is above the rim, and they drain their beer in one gulp. (Now
that you've read that, it will be a lot easier to remember
"Bottom's up!" every time you place a piece of crown molding
in the jig.)
 3.
Adjust the fence so that the top and bottom edges of the molding are
flush, as shown in the photo at right.. That is, the top of the molding
(which meets the bottom of the jig) should form a 90 degree angle where
it meets the sliding fence.
4. Tighten the two knobs on the jig to lock in your
setting. That's it! You are now all set to make every compound cut
required in a standard crown molding installation.
Making the Cuts
There are only five different cuts required in almost any crown molding
job. You are either cutting a left or right inside or outside corner, or
you are making a splice to join two lengths of molding on a long wall.
As you stand in the center of a rectangular room and look into one of
the four corners, the piece of molding which will be attached to the
wall on the left of the corner is an "inside left". If your
room has alcoves, or is L-shaped, you will have at least one outside
corner.
Not all corners are exactly 90 degrees. By using the TRUE
ANGLE protractor, you can check each angle. Divide the
number by 2 (the result will invariably be within a degree or two of
45), and set your saw accordingly for a tight fitting joint every time.
Let's make some cuts...
Take the 2 foot long template piece you cut earlier and write
"Inside" on it. Now you need to cut an inside right on one end
of the template, and an inside left on the other. Let's begin with the
inside right.
Looking at the saw, swing the blade 45 degrees to your left. Place the
molding in the jig ("Bottom's UP!) and place the jig on the bed of
the saw. The bulk of the workpiece should be to the left of the blade.
Slide the jig so that the cut will remove a minimum of waste. Make sure
the jig is NOT IN THE PATH OF THE BLADE. Without turning on the saw,
drop the blade to make sure it misses the jig. Adjust if required. Keep
your left hand on the molding inside the confines of the jig (where it
is safe), and make the cut.
To summarize: On a right inside corner, the blade is 45 degrees
to the left, and the bulk of the workpiece is to the left of the blade.
What's really nice is that you don't have to remember that -
it's printed right on the jig (along with the orientations for left
inside corners and both outside corners).
Now, let's cut a left inside corner on the other end of the template.
Looking at the saw, swing the blade 45 degrees to your right. Place the
molding in the jig ("Bottom's UP!) and place the jig on the bed of
the saw. The bulk of the workpiece should be to the right of the blade.
Slide the jig so that the cut will remove a minimum of waste. Make sure
the jig is NOT IN THE PATH OF THE BLADE. Without turning on the saw,
drop the blade to make sure it misses the jig. Adjust if required. Keep
your right hand on the molding inside the confines of the jig (where it
is safe), and make the cut.
To summarize: On a left inside corner, the blade is 45 degrees
to the right, and the bulk of the workpiece is to the right of the
blade.
When you are cutting actual pieces (as opposed to the template), you may
have to make a very slight adjustment to the 45 degrees, depending on
how close to 90 degrees your room's corners are. But you'll be
pleasantly surprised that almost all cuts will end up working quite well
with the saw set to 45 degrees. You now know how to make all your inside
and outside corner cuts. The only thing left to cover is splicing. In
that case, you place the workpiece in the jig ("Bottom's
up!"), set the blade at 45 degrees in either direction, and make a
cut at one end of one piece of molding. Then, leave the setup exactly
the same and make your second cut on the end of a second piece of
molding. As long as the angle of the miter saw blade remains the same,
you'll have a perfect splice every time.
Installation
In one hand, hold the end of the workpiece that fits in the
corner. In the other hand, hold your template. With the bottoms down,
slide them both into the corner and make minor adjustments until you
have a perfect fit (no gaps). Nail the workpiece in place - a finish
nailgun works wonderfully, and they're cheap to rent.
If the workpiece is more than a couple of feet long, you'll need a
helper. If a live body isn't available, take a look at Rockler's
Multi-Quick support. It's very inexpensive and it will hold a length of
molding in position while you make minor adjustments and/or nail the
piece in place.
Notes
You'll need to make up three templates - one for inside corners, one for
outside corners, and one for splices. They are used as visual checks so
you always make the right cut, and also to line up the molding on the
wall during installation.
Note that the jig doesn't slide on the bed of your saw once you're set
up, or that the molding doesn't slip in the jig. This is in part due to
a non-slip material applied to both faces of the back (fixed) fence - a
small detail but one you'll be delighted with in the course of the job.
The jig can handle moldings up to 4-7/8" wide (depending on the
angles of the top and bottom edges).
Choosing a Crown Molding
To see pictures of various crown molding which can be used in
applications such as walls, cabinets and furniture, visit the following
links:
 Shown:
Rockler item #53530
Suggested Tools and Supplies
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