Special Cuts - DeWalt DW718 Instruction Manual

The two flat surfaces on a given piece of crown molding are at angles
that, when added together, equal exactly 90 degrees. Most, but not all,
crown molding has a top rear angle (the section that fits flat against the
ceiling) of 52 degrees and a bottom rear angle (the part that fits flat
against the wall) of 38 degrees.
Your miter saw has special pre-set miter latch points at 31.62 degrees
left and right for cutting crown molding at the proper angle and bevel stop
pawls at 33.85˚ left and right. There is also a mark on the bevel scale at
33.85 degrees.
The chart below gives the proper settings for cutting crown molding. (The
numbers for the miter and bevel settings are very precise and are not
easy to accurately set on your saw.) Since most rooms do not have
angles of precisely 90 degrees, you will have to fine tune your settings
anyway.
PRETESTING WITH SCRAP MATERIAL
IS EXTREMELY IMPORTANT!
INSTRUCTIONS FOR CUTTING CROWN MOLDING LAYING FLAT AND
USING THE COMPOUND FEATURES
1. Molding laying with broad back surface down flat on saw table
(Figure 17).
2. The settings below are for All Standard (U.S.) crown molding with
52° and 38° angles.
BEVEL SETTING TYPE OF CUT
LEFT SIDE, INSIDE CORNER:
33.85° Left 1. Top of molding against fence
2. Miter table set right 31.62°
3. Save left end of cut
RIGHT SIDE, INSIDE CORNER:
33.85° Right 1. Top of molding against fence.
2. Miter table set at left 31.62°
3. Save right end of cut
LEFT SIDE, OUTSIDE CORNER:
33.85° Right 1. Top of molding against fence.
2. Miter table set at left 31.62°
3. Save left end of cut
RIGHT SIDE, OUTSIDE CORNER:
33.85° Left 1. Top of molding against fence
2. Miter table set right 31.62°
3. Save right end of cut
When setting bevel and miter angles for all compound miters,
remember that:
The angles presented for crown moldings are very precise and
difficult to set exactly. Since they can easily shift slightly and
very few rooms have exactly square corners, all settings should
be tested on scrap molding.
PRETESTING WITH SCRAP MATERIAL IS EXTREMELY IMPORTANT!
ALTERNATIVE METHOD FOR CUTTING CROWN MOLDING
Place the molding on the table at an angle between the fence and the saw
table, as shown in Figure 18. Use of the crown molding fence accessory
(DW7084) is highly recommended because of its degree of accuracy
and convenience. The crown molding fence accessory is available for
purchase from your local dealer.
The advantage to cutting crown molding using this method is that no bevel
cut is required. Minute changes in the miter angle can be made without
FENCE
CROWN MOLDING FLAT ON TABLE
AND AGAINST FENCE
BOTTOM SIDE OF
MOLDING
TOP SIDE
OF MOLDING
FENCE
CROWN MOLDING BETWEEN FENCE AND TABLE
affecting the bevel angle. This way, when corners other than 90 degrees
are encountered, the saw can be quickly and easily adjusted for them. Use
the crown molding fence accessory to maintain the angle at which the
molding will be on the wall.
INSTRUCTIONS FOR CUTTING CROWN MOLDING ANGLED BETWEEN
THE FENCE AND BASE OF THE SAW FOR ALL CUTS
1. Angle the molding so the bottom of the molding (part which goes
against the wall when installed) is against the fence and the top of
the molding is resting on the base of the saw, as shown in Figure 18.
2. The angled "flats" on the back of the molding must rest squarely on
the fence and base of the saw.
INSIDE CORNER:
Left side
1. Miter right at 45°
2. Save the right side of cut
Right side
1. Miter left at 45°
2. Save left side of cut
OUTSIDE CORNER:
Left side
1. Miter left at 45°
2. Save right side of cut
10
FIG. 17 FIG. 19
TABLE
FENCE
FIG. 20
FIG. 18
DW 7084 CROWN
MOLDING FENCE
TABLE
FENCE
Right side
1. Miter right at 45°
2. Save left side of cut

Special Cuts

NEVER MAKE ANY CUT UNLESS THE MATERIAL IS SECURED ON THE
TABLE AND AGAINST THE FENCE.
ALUMINUM CUTTING
ALWAYS USE THE APPROPRIATE SAW BLADE MADE ESPECIALLY FOR
CUTTING ALUMINUM. These are available at your local D
D WALT service center. Certain workpieces, due to their size, shape or
E
surface finish, may require the use of a clamp or fixture to prevent
movement during the cut. Position the material so that you will be cutting
the thinnest cross section, as shown in Figure 19. Figure 20 illustrates the
wrong way to cut these extrusions. Use a stick wax cutting lubricant when
cutting aluminum. Apply the stick wax cutting lubricant directly to the saw
blade before cutting. Never apply stick wax to a moving blade.
The wax, available at most hardware stores and industrial mill supply
houses, provides proper lubrication and keeps chips from adhering to
the blade.
BLADE
RIGHT
BLADE
WRONG
WALT retailer or
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