Craftsman 21239 - 12 in. Sliding Compound Miter Saw Operator's Manual page 24

CUTTING BASE MOLDING (FIG. GG)
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, as shown. 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.
Fig. GG
Miter saw table [ [ ! _Miter_aw_table [
miter at 45°, bevel at 0° miter at 0°, bevel at 450
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.
CUTTING CROWN MOLDING (FIG. HH, II)
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.
Fig. HH
Miter saw table I
I
Bevel/Miter Settings
Fig. II
Settings for standard crown molding lying flat
on compound miter saw table
Inside corner
Outside corner
Compound cut crown moldings
NOTE: The chart below references a
compound cut for crown molding ONLY
WHEN THE ANGLE BETWEEN THE WALLS
EQUALS 90 °.
Bevel/Miter Settings
KEY BEVEL I MITER I TYPEOFCUT
SETTING SETTING
Inside corner-Left side
[L 33.9" 31.6 _ Right 1. Position top of molding
against fence.
2, Miter table set at
RiG HT 31,6h
3. LEFT side is finished
piece.
Inside comer-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 comer-Left side
Oh 33.9" 31.6 _ Left 1. Position bottom of
molding against fence.
2. Miter table set at LEFT
31.6h
3. RIGHT side is finished
piece.
Outside comer-Right side
OR 33.9" 31.6 _ Right 1. Position top of molding
against fence.
2, Miter table set at
RiG HT 31.6h
3. RIGHT side is finished
piece.