DeWalt DHS780 - Advanced Cutting Techniques; Moulding, Pipe, and Large Material Cuts; Dust Extraction and Maintenance; Dust Management and Connection

17
ENGLISH
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.FF)
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
1
and roll the
guard up just enough to clear the workpiece, as shown in FigureFF. 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.
Dust Extraction (Fig.A, HH)

WARNING: To reduce the risk of serious personal injury, turn tool off and remove
the battery packs or power supply before transporting, making any adjustments,
cleaning, repairing, or removing/installing attachments or accessories. An
accidental start-up can causeinjury.

WARNING: Certain dust, such as oak or beech dust, is considered carcinogenic, especially
in connection with wood-treatmentadditives.
• Always use dustextraction.
• Provide for good ventilation of the workspace.
• It is recommended to wear an appropriaterespirator.

CAUTION: Never operate this saw unless a dust bag or
DeWALT
dust extractor is
in place. Wood dust may create a breathinghazard.

CAUTION: Check and clean the dust bag each time afterusing.

WARNING: When sawing aluminium, remove the dust bag, or disconnect the dust
extractor to avoid the risk offire.
Your mitre saw has a built-in dust port
25
that allows connection to either a dust bag (33mm
nozzles) or direct attachment to the
DeWALT
AirLock(DWV9000-XJ)
64
.
Observe the relevant regulations in your country for the materials to beworked.
To Attach the Dust Bag
1. Fit a dust bag to the dust port
25
.
To Empty the Dust Bag
1. Remove dust bag from the saw and gently shake or tap the dust bag toempty.
2. Reattach the dust bag back onto the dustport.
You may notice that all the dust will not come free from the bag. This will not affect cutting
performance but will reduce the saw's dust collection efficiency. To restore your saw's dust
collection efficiency, depress the spring inside the dust bag when you are emptying it and tap
it on the side of the waste bin or dustreceptacle.
External Dust Extraction
When vacuuming dry dust that is especially detrimental to health or carcinogenic, use a
special dust Class M vacuumcleaner.
Connecting to an AirLock Compatable Dust Extractor (Fig.HH)
The dust port
25
on your mitre saw is compatable with the D
e
WALT AirLock connection
system. The AirLock allows for a fast, secure connection between the dust extractor hose and
the mitresaw.
1. Ensure the collar on the AirLock connector
64
is in the unlock position. Align notches on
collar and AirLock connector as shown for unlock and lockpositions.
2. Push the AirLock connector onto the dust port
25
.
3. Rotate the collar to the lockedposition.
NOTE: The ball bearings inside collar lock into slot and secure the connection.The mitre
saw is now securely connected to the dustextractor.
MAINTENANCE

WARNING: To reduce the risk of serious personal injury, turn tool off and remove
the battery packs or power supply before transporting, making any adjustments,
cleaning, repairing, or removing/installing attachments or accessories. An
accidental start-up can causeinjury.

WARNING: To reduce the risk of serious personal injury, DO NOT touch the sharp
points on the blade with fingers or hands while performing anymaintenance.
DO NOT use lubricants or cleaners (particularly spray or aerosol) in the vicinity of the plastic
guard. The polycarbonate material used in the guard is subject to attack by certainchemicals.
Lubrication
Your power tool requires no additionallubrication.
Cleaning
Before use, carefully check the upper guard, lower guard and dust duct to determine that they
will operate properly. Ensure that chips, dust or workpiece particles do not block of one of
thefunctions.
Inside corner Outside corner
Left side
Mitre left 45°
Save left side of cut
Mitre right 45°
Save left side of cut
Right side
Mitre right 45°
Save right side of cut
Mitre left 45°
Save right side of cut
Material up to 171 mm can be cut as describedabove.
Cutting Crown Moulding (Fig. A, Z, AA)
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
16
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. Z)
1. Moulding should lay flat with the broad back surface down on the sawtable
61
.
2. Place the top of the moulding against the fence
15
.
3. The settings below are for 45° sprung crownmoulding.
Inside corner Outside corner
Left
side
Bevel left 30°
Mitre table set at right 35.26°
Save left end of cut
Bevel right 30°
Mitre table set at left 35.26°
Save left end of cut
Right
side
Bevel right 30°
Mitre table set at left 35.26°
Save right 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 Outside corner
Left
side
Bevel left 33.9°
Mitre table set at right 31.62°
Save left end of cut
Bevel right 33.9°
Mitre table set at left 31.62°
Save left end of cut
Right
side
Bevel right 33.9°
Mitre table set at left 31.62°
Save right end of cut
Bevel left 33.9°
Mitre table set at right 31.62°
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. AA)
1. Angle the moulding so the bottom of the moulding (the part which goes against the wall
when installed) is against the fence
15
and the top of the moulding is resting on the saw
table
61
.
2. The angled “flats” on the back of the moulding must rest squarely on the fence and
sawtable.
Inside corner Outside corner
Left side
Mitre right at 45°
Save right side of cut
Mitre left at 45°
Save right side of cut
Right
side
Mitre left at 45°
Save left side of cut
Mitre right at 45°
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. BB, CC)
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BB. FigureCC 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
47
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. DD, EE)
When cutting bowed material always position it as shown in FigureDD and never like that
shown in Figure EE. Positioning the material incorrectly will cause it to pinch theblade.