Cutting Crown Molding - Ryobi TS1143L Manuel D'utilisation

CUTTING CROWN MOLDING

This compound miter saw does an excellent job of cutting
crown molding. In general, compound miter saws do a better
job of cutting crown molding than any other tool made.
In order to fit properly, crown molding must be compound
mitered with extreme accuracy.
The two contact surfaces on a piece of crown molding that
fit flat against the ceiling and the wall of a room are at angles
that, when added together, equal exactly 90°. Most crown
molding has a top rear angle (the section that fits flat against
the ceiling) of 52° and a bottom rear angle (the section that
fits flat against the wall) of 38°.
LAYING MOLDING FLAT ON THE MITER
TABLE
See Figure 30.
To use this method for accurately cutting crown molding for
a 90° inside or outside corner, lay the molding with its broad
back surface flat on the miter table and against the fence.
52
°
CEILING
38
°
W
A
L
L FENCE
TOP EDGE AGAINST FENCE =
LEFT SIDE, INSIDE CORNER
RIGHT SIDE, OUTSIDE CORNER
MITER TABLE
CROWN MOLDING FLAT ON MITER TABLE
OPERATION
When setting the bevel and miter angles for compound miters,
remember that the settings are interdependent; changing
one angle changes the other angle as well.
Keep in mind that the angles for crown molding are very
precise and difficult to set. Since it is very easy for these
angles to shift, all settings should first be tested on scrap
molding. Also most walls do not have angles of exactly 90°,
therefore, you will need to fine tune your settings.
When cutting crown molding by this method the bevel angle
should be set at 33.85°
31.62° either right or left, depending on the desired cut for
the application. See the chart for correct angle settings and
correct positioning of crown molding on miter table.
The settings in the chart can be used for cutting. All Standard
(U.S.) crown molding with 52° and 38° angles. The crown
molding is placed flat on the miter table using the compound
features of the miter saw.
INSIDE
CORNER
24
The miter angle should be set at
.
FENCE
BOTTOM EDGE AGAINST FENCE =
RIGHT SIDE, INSIDE CORNER
LEFT SIDE, OUTSIDE CORNER
MITER TABLE
OUTSIDE
CORNER
Fig. 30