Jet Tools C US JMS-12SCMS - Manual (Page 27)

27
Cutting Base Molding
Base moldings and many other moldings can be
cut on a compound miter saw. The setup of the
saw depends on molding characteristics and
application. Perform practice cuts on scrap material
to achieve best results:
1. Always make sure moldings rest firmly against
fence and table. Use hold-down, crown molding
vise or C-clamps, whenever possible, and
place tape on the area being clamped to avoid
marks.
2. Reduce splintering by taping the cut area prior
to making the cut. Mark the cut line directly on
the tape.
3. Splintering typically happens due to an
incorrect blade application and thinness of the
material.
Note: Always perform a dry run cut so you can
determine if the operation being attempted is
possible before power is applied to the saw.
Bevel/Miter Settings
Settings for standard crown molding lying flat on
compound miter saw table.
Note: The chart below references a compound cut
for crown molding only when the angle between the
walls equals 90°.
Crown Molding
Your compound miter saw is suited for the difficult
task of cutting crown molding. To fit properly, crown
molding must be compound-mitered with extreme
accuracy. The two surfaces on a piece of crown
molding that fit flat against the ceiling and wall 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°.
In order to accurately cut crown molding for a 90°
inside or outside corner, lay the molding with its
broad back surface flat on the saw table.
When setting the bevel and miter angles for
compound miters, remember that the settings are
interdependent; changing one changes the other,
as well.
Type of Cut Key
Bevel
Setting Miter
Setting Procedure
Inside corner – Left
Side IL 33.9° 31.6°
Right
1. Position top of molding against fence.
2. Miter table set at RIGHT 31.6°.
3. LEFT side is finished piece.
Inside corner –
Right Side IR 33.9° 31.6° Left 1. Position bottom of molding against fence.
2. Miter table set at LEFT 31.6°.
3. LEFT side is finished piece.
Outside corner –
Left Side OL 33.9° 31.6° Left 1. Position bottom of molding against fence.
2. Miter table set at LEFT 31.6°.
3. RIGHT side is finished piece.
Outside corner –
Right Side OR 33.9° 31.6°
Right 1. Position top of molding against fence.
2. Miter table set at RIGHT 31.6°.
3. RIGHT side is finished piece