PRETESTING WITH SCRAP MATERIAL IS EXTREMELY IMPORTANT!

INSTRUCTIONS FOR CUTTING CROWN MOLDING LAYING FLAT AND USING THE COMPOUND FEATURES

1.Molding should lay flat with broad back surface down on saw table (Fig. 17).

2.Top of molding against fence.

3.The settings below are for all standard (U.S.) crown molding with 52° and 38° angles.

 

INSIDE CORNER

OUTSIDE CORNER

 

Bevel left 33.9°

Bevel right 33.9°

Left side

Miter table set at right 31.62°

Miter table set at left 31.62°

 

Save left end of cut

Save left end of cut

 

 

 

 

Bevel right 33.9°

Bevel left 33.9°

Right side

Miter table set at left 31.62°

Miter table set at right 31.62°

 

Save right end of cut

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 (Fig. 1). 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 affecting the bevel angle. This way, when corners other than 90º 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 saw table, as shown in Figure 18.

2.The angled “flats” on the back of the molding must rest squarely on the fence and saw table.

 

INSIDE CORNER

OUTSIDE CORNER

Left side

Miter right at 45°

Miter left at 45°

Save right side of cut

Save right side of cut

 

 

 

 

Right side

Miter left at 45°

Miter right at 45°

Save left side of cut

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 (FIG. 19, 20)

ALWAYS USE THE APPROPRIATE SAW BLADE MADE ESPECIALLY FOR CUTTING ALUMINUM. These are available at your local DEWALT retailer or DEWALT service center. Certain workpieces, due to their size, shape or 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.

Be sure to properly secure workpiece.

Refer to Saw Blades under Optional Accessories for correct saw blade.

BOWED MATERIAL (FIG. 21, 22)

When cutting bowed material always position it as shown in Figure 21 and never like that shown in Figure 22. Positioning the material incorrectly will cause it to pinch the blade near the completion of the cut.

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. 23)

Occasionally you will encounter a piece of wood a little too large to fit beneath the lower guard. If this occurs, simply place your right thumb on the upper side of the guard and roll the guard up just enough to clear the workpiece, as shown in Figure 23. 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. 24, 25)

Your saw can cut very wide (up to 16.1" [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 several turns and slide each fence outward. Adjust and lock the miter control so that it is at 0º miter.

2.Make a platform using a piece of 1.5" (38 mm) thick particleboard or similar flat strong 1.5" thick wood to the dimensions: 14.5" x 26" (368 x 660 mm). The platform must be flat, otherwise the material could move during cutting and cause injury.

3.Mount the 14.5" x 26" (368 x 660 mm) platform to the saw using four 3" (76.2 mm) long wood screws through the holes in the base fence (Fig. 24). Four screws must be used to 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 centered 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 (Fig. 25).

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.

After several cuts are made at various miter angles other than 0º, the platform may weaken and not properly support the work. Install a new, unused platform to the saw after presetting the desired miter angle.

CAUTION: Continued use of a platform with several kerfs may cause loss of material control and possible injury.

Removing and Replacing Belt (Fig. 4, 26)

The belt is designed to last the life of the tool. However, abuse of the tool could cause the belt to fail. If the blade does not turn when the motor is running, the belt has failed. To inspect or replace the belt, remove the belt cover screws. Remove the belt cover. Inspect the ribs of the belt for wear or failure. Check belt tension by squeezing the belt as shown in Figure 26. The belt halves should almost touch when squeezing firmly with the thumb and index finger. To adjust the tension, loosen, but do not remove, the four crosshead screws shown. Then rotate the set screw on the top of the motor plate casting until the proper tension is achieved. Tighten the four screws securely and replace the belt cover.

NOTICE: Overtightening the belt will cause premature motor failure.

MAINTENANCE

WARNING: To reduce the risk of serious personal injury, turn off the tool and disconnect it from the power source before attempting to move it, change accessories or make any adjustments.

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.

All bearings are sealed. They are lubricated for life and need no further maintenance.

Periodically clean all dust and wood chips from around AND UNDER the base and the rotary table. Even though slots are provided to allow debris to pass through, some dust will accumulate.

The brushes are designed to give you several years of use. If they ever need replacement follow the instructions under Brushes or return the tool to the nearest service center for repair.

Worklight Cleaning

For the best worklight performance, perform the following maintenance regularly.

Carefully clean sawdust and debris from worklight lens with a cotton swab.

DO NOT use solvents of any kind, they may damage the lens.

Dust build-up can block the worklight and prevent it from accurately indicating the line of cut.

Follow miter saw’s instruction manual to remove and install blade.

With blade removed from saw, clean pitch and build-up from blade. Pitch and debris can interfere with the worklight and prevent it from accurately indicating the line of cut.

SPECIFICATIONS

Light source

Power LED

Worklight

3.3 V DC

Power Supply

Input: 120–240 V AC; 50/60Hz

 

Output: 5 V DC; 0.45 A

Operating Temperature

14°F to 104°F (-10°C to 40°C)

Storage Temperature

-22°F to 176°F (-30°C to 80°C)

Environmental

Water resistant

Dust Duct Cleaning

Depending on your cutting environment, saw dust can clog the dust duct and may prevent dust from flowing away from the cutting area properly. With the saw unplugged and the saw head raised fully, low pressure air or a large diameter dowel rod can be used to clear the dust out of the dust duct.

Brushes

WARNING: To reduce the risk of serious personal injury, turn off the tool and disconnect it from the power source before attempting to move it, change accessories or make any adjustments.

Inspect carbon brushes regularly by unplugging tool, removing the motor endcap (Fig. 4), lifting the brush spring and withdrawing the brush assembly. Keep brushes clean and sliding freely in their guides. Always replace a used brush in the same orientation in the holder as it was prior to its removal. If the brushes are worn down to approximately 1/2" (12.7 mm), the springs will no longer exert pressure and they must be replaced. Use only identical DEWALT brushes. Use of the correct grade of brush is essential for proper operation of electric brake. New brush assemblies are available at DEWALT service centers. The tool should be allowed to “run in” (run at no load) for 10 minutes before use to seat new brushes. The electric brake may be erratic in operation until the brushes are properly seated (worn in). Always replace the brush inspection cap after inspection or servicing the brushes.

While “running in” DO NOT TIE, TAPE, OR OTHERWISE LOCK THE TRIGGER SWITCH ON. HOLD BY HAND ONLY.

Service Information

Please have the following information available for all service calls:

Model Number __________________ Serial Number _____________________________________

Date and Place of Purchase __________________________________________________________

Repairs

To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustment should be performed by a DEWALT factory service center, a DEWALT authorized service center or other qualified service personnel. Always use identical replacement parts.

Three Year Limited Warranty

DEWALT will repair, without charge, any defects due to faulty materials or workmanship for three years from the date of purchase. This warranty does not cover part failure due to normal wear or tool abuse. For further detail of warranty coverage and warranty repair information, visit www.dewalt. com or call 1-800-4-DEWALT (1-800-433-9258). This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. This warranty gives you specific legal rights and you may have other rights which vary in certain states or provinces. In addition to the warranty, DEWALT tools are covered by our:

1 YEAR FREE SERVICE

DEWALT will maintain the tool and replace worn parts caused by normal use, for free, any time during the first year after purchase.

90 DAY MONEY BACK GUARANTEE

If you are not completely satisfied with the performance of your DEWALT Power Tool, Laser, or Nailer for any reason, you can return it within 90 days from the date of purchase with a receipt for a full refund – no questions asked.

LATIN AMERICA: This warranty does not apply to products sold in Latin America. For products sold in Latin America, see country specific warranty information contained either in the packaging, call the local company or see website for warranty information.

FREE WARNING LABEL REPLACEMENT: If your warning labels become illegible or are missing, call 1-800-4-DEWALT (1-800-433-9258) for a free replacement.

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DeWalt DWS780 instruction manual Maintenance