DeWalt DHS780, Original Instructions Manual

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39
EnGLISH
To reduce effects of vibration make sure the environment temperature is not too cold, the
machine and accessories are well maintained and the workpiece size is suitable for this machine.
Proper Body and Hand Position (Fig. R, S)
WARNING: To reduce the risk of serious personal injury, ALWAYS use proper hand
position as shown in Figure R.
WARNING: To reduce the risk of serious personal injury, ALWAYS hold securely in
anticipation of a sudden reaction.
• Never place hands near cutting area. Place hands no closer than 100 mm from the blade.
• Hold the workpiece tightly to the table and the fence when cutting. Keep hands in
position until the trigger has been released and the blade has completely stopped.
• ALWAYS MAKE DRY RUNS (UNPOWERED) BEFORE FINISH CUTS SO THAT YOU CAN CHECK
THE PATH OF THE BLADE. DO NOT CROSS HANDS, AS SHOWN IN FIGURE S.
• Keep both feet firmly on the floor and maintain proper balance. As you move the mitre
arm left and right, follow it and stand slightly to the side of the saw blade.
• Sight through the guard louvers when following a pencil line.
Switching On and Off (Fig. A)
To turn the saw on, push the trigger lock-off button 5 to the left, then depress the trigger
switch 4 . The saw will run while the switch is depressed. Allow the blade to spin up to full
operating speed before making the cut. To turn the saw off, release the switch. Allow the blade
to stop before raising the saw head. There is no provision for locking the switch on. A hole
36
is provided in the trigger for insertion of a padlock to lock the switch off
Use of XPS™ LED Worklight System (Fig. A)
nOTE: The mitre saw must be connected to a power source.
The XPS™ LED Worklight System can be turned on by the momentary switch 20 . The light
will automatically turn off within 20 seconds if the saw is not in use. The light will activate
automatically every time the tool's main trigger
4 is pulled.
To cut through an existing pencil line on a piece of wood:
1. Turn on the XPS™ system, then pull down on the operating handle 2 to bring the saw
blade close to the wood. The shadow of the blade will appear on the wood.
2. Align the pencil line with the edge of the blade’s shadow. You may have to adjust the mitre
or bevel angles in order to match the pencil line exactly.
Through-Cutting Operations (Fig. A, T, U)
If the slide feature is not used, ensure the saw head is pushed back as far as possible and the
rail lock knob
23 is tightened. This will prevent the saw from sliding along its rails as the
workpiece is engaged.
Cutting of multiple pieces is not recommended but can be done safely by ensuring that each
piece is held firmly against the table and fence.
Straight Vertical Crosscut (Fig. A)
1. Set and lock the mitre arm at zero, and hold the wood firmly on the table and against the
fence 15 .
2. With the rail lock knob 23 tightened, turn on the saw by squeezing the trigger switch 4 .
3. When the saw comes up to speed, lower the arm smoothly and slowly to cut through the
wood. Let the blade come to a full stop before raising arm.
Sliding Crosscut (Fig. A, T)
When cutting anything larger than a 51 x 150 mm (51 x 105 mm at 45° mitre) workpiece, use
an out-down-back motion with the rail lock knob
23 loosened.
1. Pull the saw out toward you.
2. Lower the saw head down toward the workpiece.
3. Slowly push the saw back to complete the cut.
Do not allow the saw to contact the top of the workpiece while pulling out. The saw may run
toward you, possibly causing personal injury or damage to the workpiece.
Mitre Crosscut (Fig. U)
The mitre angle is often 45° for making corners, but can be set anywhere from zero to 50° left
or 60° right. Proceed as for a straight vertical crosscut.
When performing a mitre cut on workpieces wider than 51 x 105 mm that are shorter in
length, always place the longer side against the fence.
Bevel Cut (Fig. A)
Bevel angles can be set from 49° right to 49° left and can be cut with the mitre arm set
between 50° left or 60° right. Refer to the
Features and Controls section for detailed
instructions on the bevel system.
1. Loosen the bevel lock knob 27 , and move the saw to the left or right as desired. It
is necessary to move or remove the fence 15 to allow clearance. Tighten the fence
adjustment knob 35 after positioning the fences.
2. Tighten the bevel lock firmly.
At some extreme angles, the right or left side fence might have to be removed. Refer to Fence
Adjustment
in the
Adjustments
section for important information on adjusting the fences for
certain bevel cuts.
To remove the left or right fence, unscrew the fence adjustment knob
35 several turns and
slide the fence out. The fence lanyard 37 prevents the fence from being removed completely
from the saw or being lost.
Once the bevel operations are completed, reposition the fences.
To adjust the right 22.5° bevel angle, flip out the right 22.5° bevel pawl 54 . Loosen the bevel
lock knob 27 and pull the bevel stop override knob 29 to override the 0° bevel stop. When
the saw is fully to the right, if the bevel pointer does not indicate exactly 22.5°, turn the crown
adjustment screw 52 contacting the pawl with a 10 mm wrench until the bevel pointer
indicates exactly 22.5°.
Fence Adjustment (Fig. A)
The upper part of the fence can be adjusted to provide clearance, allowing the saw to bevel to
a full 49° both left and right.
1. To adjust each fence 15 , loosen the fence adjustment knob 35 and slide the fence outward.
2. Make a dry run with the saw turned off and check for clearance.
3. Adjust the fence to be as close to the blade as practical to provide maximum workpiece
support, without interfering with arm up and down movement.
4. Tighten the fence adjustment knob securely.
5. When the bevel operations are complete, relocate the fence.
For certain cuts, it may be desirable to bring the fences closer to the blade. To do so, loosen
the fence adjustment knobs 35 and slide the fences closer to the blade past the normal limit,
then tighten the fence adjustment knobs. Make a dry cut first to ensure the blade does not
contact the fences.
For certain cuts it may be desirable to remove the sliding fence. To do so, loosen the fence
adjustment knobs 35 and slide the fence completely free of the base fence. The fence
lanyard 37 prevents the fence from being removed completely from the saw or being lost.
Once the cut is complete, replace the sliding fence.
nOTE:
The tracks of the fences can become clogged with sawdust. Use a brush or some low
pressure air to clear the guide grooves.
Guard Actuation and Visibility (Fig. A)
The lower guard 1 on your saw has been designed to automatically uncover the blade when
the arm is brought down and to cover the blade when the arm is raised.
The guard can be raised by hand when installing or removing saw blades or for inspection of
the saw. NEVER RAISE THE LOWER GUARD MANUALLY UN LESS THE BLADE IS STOPPED.
Rail Guide Adjustment (Fig. A)
Regularly check the rails 22 for play or clearance. Ensure the rail lock knob 23 is loosened.
The right rail can be adjusted with the rail adjustment screw 24 . To reduce clearance, use a
4 mm hex wrench (not provided) and rotate the set screw clockwise gradually while sliding
the saw head back and forth.
Mitre Lock Adjustment (Fig. A, Q)
The mitre lock rod 60 should be adjusted if the table of the saw can be moved when the
mitre lock handle is locked (down) and in a non-detented position.
1. Put the mitre lock handle 7 in the unlocked (up) position.
2. Using a 13 mm open end wrench, loosen the lock nut 59 on the mitre lock rod.
3. Using a slotted screwdriver, tighten the mitre lock rod by turning it clockwise as shown in
Figure Q. Turn the lock rod until it is snug, then turn counterclockwise one turn.
4. Re-lock the mitre lock to a non-detented measurement on the mitre scale – for example,
34° – and make sure the table will not rotate.
5. Tighten lock nut.
Prior to Operation
• Install the base extensions to both sides of the saw's base. Refer to Assembling the Base
Extensions section.
• Check the protective belt cover for damage and the proper functioning of the lower guard.
• Make sure to use the kerf plate. Do not operate the machine if the kerf slot is wider than
12 mm.
• Install the appropriate saw blade. Do not use excessively worn blades. The maximum
rotation speed of the tool must not exceed that of the saw blade.
• Make sure all locking knobs and clamp handles are tight.
• Use personal protective equipment and connect the saw to an external dust extractor.
• Although this saw will cut wood and many nonferrous materials, these operating
instructions refer to the cutting of wood only. The same guide-lines apply to the other
materials. Do not cut ferrous (iron and steel) materials, fibre cement or masonry with
this saw!
• Do not attempt to cut excessively small pieces.
• Secure the workpiece.
• Allow the blade to cut freely. Do not force.
• Allow the motor to reach full speed before cutting.
OPERATION
Instructions for Use
WARNING: Always observe the safety instructions and applicable regulations.
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.
Be sure the
trigger switch is in the OFF position. An accidental start-up can cause injury.
Refer to
Saw Blades
under
Optional Accessories
to select the blade that best fits your needs.
Ensure the machine is placed to satisfy your ergonomic conditions in terms of table height
and stability. The machine site shall be chosen so that the operator has a good overview and
enough free surrounding space around the machine that allows handling of the workpiece
without any restrictions.