DeWalt DHS780 Original Instructions Manual page 41

8 SIDED BOX
SET THIS BEVEL ANGLE ON SAW
• Select the desired angle A (Fig. S) of your project and locate that angle on the appropriate
arc in the chart.
• From that point follow the chart straight down to find the correct bevel angle and straight
across to find the correct mitre angle.
• Set your saw to the prescribed angles and make a few trial cuts. Practise fitting the cut
pieces together.
Example: To make a 4-sided box with 26° exterior angles (Angle A, Fig. S), use the upper right
arc. Find 26° on the arc scale. Follow the horizontal intersecting line to either side to get mitre
angle setting on saw (42°). Likewise, follow the vertical intersecting line to the top or bottom
to get the bevel angle setting on the saw (18°). Always try cuts on a few scrap pieces of wood
to verify the settings on the saw.
Cutting Base Moulding (Fig. J, T)
ALWAYS MAKE A DRY RUN WITHOUT POWER BEFORE MAKING ANY CUTS.
To complete straight 90° cuts, position the wood against the fence and hold it in place as
shown in Figure T. Turn on the saw, allow the blade to reach full speed and lower the arm
smoothly through the cut.
cutting Base Molding from 76 mm to 171 mm High Vertically Against
the Fence
nOTE: Use the slide lock lever
20 , shown in Figure J, when cutting base molding measuring
from 76 mm to 171 mm high vertically against the fence.
Position material as shown in Figure T.
Inside corner
Mitre left 45°
Left side
Save left side of cut
Mitre right 45°
Right side
Save right side of cut
Material up to 171 mm (6.75") can be cut as described above.
Cutting Crown Moulding (Fig. A, U1, U2)
Your mitre saw is well suited to the task of cutting crown moulding. In order to fit properly,
crown moulding must be compound mitred with extreme accuracy.
Your mitre saw has special pre-set mitre latch points at 31.62° left and right for cutting crown
moulding at the proper angle and bevel stop pawls at 33.86° left and right. There is also a
mark on the bevel scale 17 at 33.9°. The chart below gives the proper settings for cutting
crown moulding.
nOTE: Pretesting with scrap material is extremely important!
Instructions for Cutting Crown Moulding Laying Flat and Using
the Compound Features (Fig. U1)
1. Moulding should lay flat with the broad back surface down on the saw table
2. Place the top of the moulding against the fence
3. The settings below are for 45° sprung crown moulding.
Inside corner
Bevel left 30°
Left
Mitre table set at right 35.26°
side
Save left end of cut
Bevel right 30°
Right
Mitre table set at left 35.26°
side
Save right end of cut
SQUARE BOX
6 SIDED BOX
Outside corner
Mitre right 45°
Save left side of cut
Mitre left 45°
Save right side of cut
60
16 .
Outside corner
Bevel right 30°
Mitre table set at left 35.26°
Save left end of cut
Bevel left 30°
Mitre table set at right 35.26°
Save right end of cut
The settings below are for crown moulding with 52° angles at the top and 38° angles at
the bottom.
Inside corner
Bevel left 33.9°
Left
Mitre table set at right 31.62°
side
Save left end of cut
Bevel right 33.9°
Right
Mitre table set at left 31.62°
side
Save right end of cut
Alternative Method for Cutting Crown Moulding
Cutting crown moulding using this method does not require a bevel cut. Minute changes in
the mitre angle can be made without affecting the bevel angle. When corners other than 90°
are encountered, the saw can be quickly and easily adjusted for them.
Instructions for Cutting Crown Moulding Angled Between the
Fence and Base of the Saw for All Cuts (Fig. U2)
1. Angle the moulding so the bottom of the moulding (the part which goes against the wall
when installed) is against the fence
table .
60
2. The angled "flats" on the back of the moulding must rest squarely on the fence and
saw table.
Inside corner
Mitre right at 45°
Left side
Save right side of cut
Right Mitre left at 45°
side Save left side of cut
Special Cuts

WARNING: Never make any cut unless the material is secured on the table and
against the fence.
Aluminum Cutting (Fig. V1, V2)
ALWAYS USE THE APPROPRIATE SAW BLADE MADE ESPECIALLY FOR CUTTING ALUMINUM.
Certain workpieces 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 V1. Figure V2 illustrates the wrong way to cut these extrusions.
Use a stick wax cutting lubricant when cutting aluminum. Apply the stick wax directly to the
saw blade 46 before cutting. Never apply stick wax to a moving blade. The wax provides
proper lubrication and keeps chips from adhering to the blade.
Bowed Material (Fig. W1, W2)
When cutting bowed material always position it as shown in Figure W1 and never like that
shown in Figure W2. Positioning the material incorrectly will cause it to pinch the blade.
Cutting Plastic Pipe or Other Round Material
Plastic pipe can be easily cut with your saw. It should be cut just like wood and CLAMPED OR
HELD FIRMLY TO THE FENCE TO KEEP IT FROM ROLLING. This is extremely important when
making angle cuts.
Cutting Large Material (Fig. X)
Occasionally you will encounter a piece of wood a little too large to fit beneath the lower
guard. If this occurs, place your right thumb on the upper side of the guard
guard up just enough to clear the workpiece, as shown in Figure X. Avoid doing this as much
as possible, but if need be, the saw will operate properly and make the bigger cut. NEVER TIE,
TAPE, OR OTHERWISE HOLD THE GUARD OPEN WHEN OPERATING THIS SAW.
Special Set-up for Wide Crosscuts (Fig. Y1, Y2)
Your saw can cut very wide (up to 409 mm) workpieces when a special set-up is used. To set
the saw up for these workpieces, follow these steps:
1. Remove both left and right sliding fences from the saw and set aside. To remove them,
unscrew the fence adjustment knobs
Adjust and lock the mitre control so that it is at 0° mitre.
2. Make a platform using a piece of 38 mm thick particleboard or similar flat strong 38 mm
thick wood to the dimensions: 368 x 660 mm. The platform must be flat, otherwise the
.
material could move during cutting and cause injury.
3. Mount the 368 x 660 mm platform to the saw using four 76.2 mm long wood screws
through the holes in the base fence
62
properly secure the material. When the special set-up is used, the platform will be cut into
two pieces. Ensure the screws are tightened properly, otherwise material could loosen and
cause injury. Ensure the platform is firmly flat on the table, against the fence, and centred
evenly from left to right.

WARNING: Ensure the saw is mounted firmly to a stable flat surface. Failure to do so
could cause the saw to be unstable and fall causing personal injury.
4. Place the workpiece to be cut on top of the platform mounted to the table. Ensure the
workpiece is firmly against the back of the base fence
5. Secure the material before cutting. Cut slowly through the material using a out-down-
and-back motion. Failure to clamp securely or cut slowly could result in the material
coming loose and causing injury.
Outside corner
Bevel right 33.9°
Mitre table set at left 31.62°
Save left end of cut
Bevel left 33.9°
Mitre table set at right 31.62°
Save right end of cut
16 and the top of the moulding is resting on the saw
Outside corner
Mitre left at 45°
Save right side of cut
Mitre right at 45°
Save left side of cut
1 and roll the
several turns and slide each fence outward.
63
(Fig. Y1). Four screws must be used to
61
61 (Fig. Y2).
EnGLISH
39