Black & Decker 9425 User manual

m BUGK&OECKER.
Instruction Manual
SVa” Compound Miter Saw
9425
.322765

Welcome to
Black & Decker's
wonderful world of
PowerTools.
If you already own a Black &
Decker Power Tool you know the plea¬
sures a high quality, high performance
power tool can deliver.
Your new Compound Miter Saw
has been carefully engineered and built
to Black & Decker's high standards for
quaiity and dependability. It’s built to last
for many years of tough, trouble-free
service and high quality performance.
It can cut wood, plastics and com¬
positions. Use it for straight cuts, miters,
bevels or compound miters. Its tough,
die cast aluminum rotating table locks
firmly in place for accurate cutting of
molding, trim work, construction lumber
and even plastic pipe.
So take a few minutes and
thoroughly read this instruction manual.
Pay particular attention to the Safety
Rules we’ve provided for your
protection.
We want you to enjoy your
Compound Miter Saw, and the more
you know about it, and its capabilities,
the happier you’ll be with it.
Thank you for selecting Black &
Decker.
And don’t forget to send in your
owner’s registration card.
2

SAFETY INSTRUCTIONS
WARNING: When using Electric Tools, basic safety precautions should always be followed to reduce
the risk of fire, electric shock, and personal injury, including the following:
READ ALL INSTRUCTIONS
1 KEEP GUARDS IN PLACE and in working order.
2. REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to see that keys and adjusting
wrenches are removed from tool before turning it on.
—3. KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries..-. .
4. DONT use IN DANGEROUS ENVIRONMENT. Don’t use power toots in damp or wet locations, or
expose them to rain. Keep work area well lighted.
5. KEEP CHILDREN AWAY. AH visitors should be kept a safe distance from work area.
6. MAKE WORKSHOP KID PROOF with padlocks, master switches, or by removing start keys.
7. DONT FORCE TOOL. Ifwill do the job better and safer at the rate for which it was designed.
8. USE RIGHT TOOL. Don't force tool or attachment to do the job for which it was not designed.
9. WEAR PROPER APPAREL. Don't wear loose clothing, gloves, neckties, rings, bracelets, or other jewelry
that could get caught in moving parts. Nonslip footwear is recommended. Wear protective hair covering to
contain long hair.
10. ALWAYS WEAR SAFETY GLASSES. Also use face or dustmask if cutting operation is dusty. Everyday
eyeglasses have only impact resistant lenses, they are NOT safety glasses.
11. SECURE WORK. Use clamps or vise to hold work when practical. It’s safer than using your hand and it
frees both hands to operate tool.
12. DONT OVERREACH. Keep proper footing and balance at all times.
13. MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for best and safefet performance. Follow
instructions for lubricating and changing accessories.
14. DISCONNECT TOOLS before servicing, and when changing accessories such as blades, bits, cutters, or
when clearing away sawdust..
15. REDUCE THE RISK OF UNINTENTIONAL STARTING. Make sure switch is in OFF position before
plugging in.
16. USE RECOMMENDED ACCESSORIES. Consult the instruction manual for recommended accessories.
The use of improper accessories may cause risk of injury to persons.
17. NEVER STAND ON TOOL. Serious injury could occur if the tool is tipped or if the cutting tool is
unintentionally contacted.
18. CHECK DAMAGED PARTS. Before further use of the tool, a guard or other part that is damaged should
be carefully checked to determine that it will operate properly and perform its intended function—check for
alignment of moving parts, binding of moving parts, breakage of parts, mounting and any other conditions
that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced.
19. NEVER LEAVE TOOL RUNNING UNATTENDED. TURN POWER OFF. Don’t leave tool until it comes
to a complete stop.
20. DO NOT OPERATE ELECTRIC TOOLS NEAR FLAMMABLE LIQUIDS OR IN GASEOUS OR
EXPLOSIVE ATMOSPHERES. Motors in these tools may spark and ignite fumes.
21. For your own safety, READ INSTRUCTION MANUAL before operating your miter saw
22. KEEP HANDS OUT OF PATH OF SAW BLADE.
23. DO NOT ATTEMPT ANY FREE HAND CUTTING with this saw.
24. NEVER REACH around or behind saw blades.
25. SHUT OFF POWER AND WAIT FOR SAW BLADETO STOP before servicing or adjusting the saw.
SAVE THESE INSTRUCTIONS FOR FUTURE USE.
REFER TO PAGE 4 FOR ADDITIONAL SAFETY NOTES.
3

Additionat
Safety Rules For The
Compound Miter Saw
1. DO — Protect at feast a 15
,'. ampere time delay fyse.
2, DO — Make certain the -balde
'''' rotates in the correct direction.
■ 3. DO — Be mre all clamp handles are
tight before'starting any operation.
4. DO'— Be sure blade and arbor col-
^ _ 'Jars are clean and recessed side of
collars are against blade. Tighten ^
arbor screw securely.
5. DO — Keep saw blade sharp and
properly set.
6. DO — Keep motor air slots clean
and free of chips. '
7. DO — Use both upper and lower
blade guards at all times.
8. DO — Operate only on designated
voltage and frequency.
9. DO — Tighten all clamps before
operating.
to. DO — Use blades of recommended
size only.
11. DO — Hold motor shaft/saw blade
only as instructed in this manual.
12. DO — Operate in dry environment
only.
13. DO — Allow motor to reach full
speed before cutting.
14. DO — Keep visitors dear.
16. DO — Keep hands clear of blade
area when saw is plugged in.
16. DO — Use blades recommended for
operation at greater than 3600 RPM
only.
NOTE: This saw should NOT be
used to cut ferrous metals or masonry.
NOTE: This saw should NEVER be
used to recut smalt pieces.
Electrical Connection
Your Miter Saw is powered by a
Black & Decker built motor. Be sure your
power supply agrees with the nameplate
marking. 120 Volts, 60 Hz or “AC only"
means your tool must be operated only
with alternating current and NEVER with
direct current. A voltage decrease of
more than 10% will cause loss of power
and overheating. All B&O tools are fac¬
tory tested; if this tool does not operate,
check the power supply.
Double-Insulation
Your tool is double Insulated to give
you added safety. This means that it is
constructed throughout wtih TWO
separate “layers” of electrical insulation
or one DOUBLE thickness of insulation
between you and the tool's electrical
system.
Tools built with this improved insula¬
tion system are not Intended to be
grourided. As a result, your tool is
equipped with a two-prong plug which
permits you to use any conventional 120
volt electrical outlet without concern for
maintaining a ground connection.
NOTE: Ctouble-lnsulation does not
take the place of normal safety precau¬
tions when operating this too). The
improved insulation system is for added
protection against injury resulting from a
possible electrical insulation failure within
the too).
CAUTION: When servicing
Double-insulated Tools, USE ONLY
IDENTICAL REPLACEMENT PARTS.
Replace or repair damaged cords.
This tool is intended for residen¬
tial use only.
Extension Cords
When using the tool at a consldera-
ble distance from the power source, an ''
extension cord of adequate'size must be
used for safety, and to prevent loss of
power and overheating.-Use the table
below to determine minimum wire size
required.
'Before using cords, inspect them for
'loose or exposed wires and damaged
insulation. Make any needed refMirs or
replacement before using your power
tool.
Chart For Minimum Wire Size
(AWG) of Extension Cords
Total Extension Cord'
Length-Feet
26 50 75 100
120 Volt 16 14 12 , 10
Tools
NOTE: the lower the wire size num¬
ber, the heavier the wire, and the farther it
will carry current without a significant volt¬
age drop.
Unpacking Your Saw
Inspect the contents of your saw
carton. In addition to this Instruction
Manual, you should find the foltowing:
1. One #9425 Compound Miter Saw
2. One plastic wing knob, packed inside
cardboard filler block next to blade

Setup
FAMILfARiZATlON: Place the Miter
Saw on a flat, strong and level surface,
and examine it to become familiar with
the terminology used to describe its var*
ious parts. (See Figures 1 and 2.)
UNLOCKING THE PIVOT ARM:
Your saw was shipped from the factory
with the pivot arm in the locked down
position This position is used to facilitate
packaging and for storage.
To release the pivot arm, remove
the-cardboard filler block from the saw
table, grasp the s^witch handle with one
hand and the end of the lock pin with the
other, as shown \q Figure 3. Push down
on the switch handle lightly and pull out
on the lock pin. When the pin is out as far
as it will go. raise the pivot arm to its full
height. (The saw will look like the picture
in Figure 4.)
Before using your miter saw. it must
be firmly mounted to your workbench or
other rigic^frame. Four holes are provided
in the base of the saw for this purpose.
To mount the saw, position it as
desired (don’t forget about the availability
of an etectrica! outlet), and mark the posi¬
tions of the four holes in the saw.
Remove the saw and drill four pilot holes
in the places you marked. Reposition the
saw over the holes and secure it to the
workbench using 1/4" x 1-374" wood
screws, as shown in Figure 5. (Do not
overtighten.)

FIG. 8

Lower
Blade Guard
Miter
Clamp Knob
Miter
Scale
Operation
WEAR EYE PROTECTION.
To cut a piece of wood, first
determine that it’s the right size for
the saw. Place the wood on the saw
table and hold it firmly against the
fence. If the piece you’re working
with is smaller than 6" long and
would cause your hand to be within
6" of the saw blade. TURN OFF
AND UNPLUG THE SAW and
clamp the wood to the fence before
cutting it.
Do not attempt to hold small
pieces. NEVER ATTEMPT ANY
FREE HAND CUTTING WITH
THIS SAW. (Free hand cutting is
cutting wood that is not held
firmly against the fence and the
saw table. Support long work with
an outboard work rest.)
Cutting Tips
WEAR EYE PROTECTiON.
The smoothness of any cut de¬
pends on a number of variables. Things
like material being cut. blade type, blade
sharpness and rate of cut all combine to
affect the quality of the cut.
When cutting framing lumber or
other types of lumber where cut smooth¬
ness fs not a point of concern, high cut¬
ting rate coupled with a sharp general
purpose blade will produce satisfactory
results.
When smoother cuts are desired, a
sharp blade designed for smooth cuts
and a slow even cutting rate will produce
the desired quality of cut.
For varied cutting applications, refer
to the list of recommended accessories
for your saw and select the blade that
best fits your needs
Replacing Saw
Blades
Follow the steps below to replace a
saw blade
1 TURN OFF AND UNPLUG THE
SAW.
2 Allow the saw arm to raise to its full
height.
3. Using the hex wrench located in the
saw table, shown in Figure 10. loosen
hex screw *‘A" in Figure 11 four full
turns counter-clockwise.
4. man¬
ually raise the lower blade guard.
5. Using the same hex wrench, remove
the arbor screw in the center of the
motor shaft. (Left hand thread: turn
clockwise to loosen.} NOTE: Place a
screwdriver or large nail through the
hole in the saw blade (see Figure 12)
to hold it while you tighten or loosen
the screw. BE SURE TO REMOVE
IT WHEN YOU FINISH.
7

6. R emove the old blade and install the
new one taking care to oridVit the two
blade washers carefully, as shown in
Figure 13.
7. Manually lower the blade guard as far
as it will go.
8. Tighten hex screw “A” clockwise until
tight. (DO NOT OVER-TIGHTEN.)
Replace the hex wrench in the saw
table.
Picture Frames,
Shadow Boxes &
Similar Four-Sided
Projects
For a more thorough understanding,
we suggest that you perform these cuts
using scrap wood. Your new saw is the
perfect tool for making closed objects
v^ere it’s necessary to join wood sides
and construct corners. Figure 14 shows
two typical types of mitered corners.
The example in Figure A is a joint
made by using the bevel adjustment to
bevel the edges of the boards (at 45®
each) to form a 90® miter corner. For this
operation, set the bevel post adjustment
at 45° and the miter table adjustment at
0^. Position the wood with the broad flat
side against the table and the narrow
edge against the fence.
The example shown in Figure B
is a joint made by using the miter table
adjustment to miter the width of the board
(at 45® each) to form a miter corner of
90°. For this operation, set the bevel post
adjustment at 0° and the miter table
adjustment at 45®. Position the wood with
the broad flat, surface against the table
and the narrow edge against the fence.
NOTE: The examples shown and
discussed above are for four-sided fig¬
ures only. The chart in Figure 15 shows
the setting for the miter table or bevel
post for several different shapes.
Observe that the angle of cut decreases
as the number of sides increases. These
angles are derived from the formula:
180® r number of sides in desired object
= miter angle for each joint
1 FIG. 15
-EXAMPLES —
NO.
ANGLE
SfOES
MITER OR BEVEL 1
■ HE
25.7®
8
22.5®
. ....... 9
...:.- •; -.
10
o
00
Cutting
Compound Miters
A compound miter is a cut made
using both a miter setting (made by
adjusting the miter table) and a bevel set¬
ting (made by adjusting the bevel post)
The resulting cut is a beveled (or com¬
pound) miter. These cuts are used for
making frames or boxes with sloping
sides like those shown in Figure 16. The
important thing to remember when mak¬
ing compound miters is that the adjust¬
ments of miter and bevel are inter¬
dependent with one another. Each lime
you adjust the miter table you change the
bevel setting; and every adjustment to
bevel changes the miter setting. It may
take several settings to obtain the
desired cut. ALWAYS MAKE TEST
CUTS IN SCRAP MATERIAL
BEFORE ATTEMPTING FINISHED
WORK.

Cutting Crown Molding
Your Compound Miter Saw is probably better suited to the difficuft task of cut¬
ting crown molding than any other tool made. In order to fit properly, crown mold¬
ing must be compound mitered with extreme accuracy (see Figure 17).
The two surfaces on a piece of crown molding that fit flat against the ceiling
and the wall of a room are at angles that when added together, equal exactly 90^
Most crown molding has a top rear angle (the section that fits flat against the ceil¬
ing) of 52° and a bottom rear angle that fits flat against the wall of 38®
In order to accurately cut crown molding for a 90° inside or outside corner,
refer to the chart that follows.
FOR ALL CUTS:
1. Molding laying with broad back surface down flat on saw table
2. The settings below are for All Standard (U S.) crown molding with 52° and 38°
angles.
BEVEL POST
SETTING
TYPE OF CUT
33.85°
LEFT SIDE, INSIDE CORNER:
1. Top of molding against fence
2. Miter table set right 31.62°
3. Save left end of cut
33.85°
RIGHT SIDE, INSIDE CORNER:
1. Bottom of molding against fence
2. Miter table set left 31.62°
3. Save left end of cut
33.85°
LEf=T SIDE, OUTSIDE CORNER;
1. Bottom of molding against fence
2. Miter table set left 3T.62°
3. Save right side of cut
33.85°
RIGHT SIDE, OUTSIDE CORNER:
1. Top of molding against fence
2. Miter table set right 31.62°
3. Save right side of cut
When setting bevel post and miter table angles for all compound miters,
remember that:
1. The settings are interdependent so that changing one changes the other as
well, and
2. 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 IMPORTANTI
9

Accessories
The accessories fisted in this manual are available at extra cost from
your (ocaf deafer or Black & Decker Service Center.
A complete listing of service centers is included on the owner's
registration card packed with your tool.
If you need assistance in locating any accessory please contact:
Black & Decker (U.S.) Inc.
User Services Department
to North Park Drive
P.O.Box 857
Hunt Valley. MD 21030-0867
Saw Biades
Cat. No.
Diameter
Arbor Size/Descrfption
73-291
8-174"
5/8" General purpose combination
73-293
8-1/4"
5/8" Premium hollow ground planer
73-294
8-1/4"
5/8" Crosscut miter
73-390
8-1/4"
5/8" Carbide tipped carbide (20 tooth)
73-391
8-1/4"
5/8" Carbide tipped carbide (40 tooth)
Other Accessories
72-000 Safety Glasses
The accessories listed above are recommended for use with your #9425
8-1 /4 In. Compound Miter Saw. THE USE OF ANY OTHER ACCESSORY OR
ATTACHMENT MAY BE HAZARDOUS.
NOTE: A vacuum port on the blade guard is designed to accept a standard
1-1/2" diameter vacuum cleaner hose for dust collection.
Lubrication and
Maintenance
Permanently lubricated bearings
are used throughout your Miter Saw and
periodic lubrication is not required. In the
unlikely event that service is ever re¬
quired. take your saw to your closest
Black & Decker Service Center as listed
on your Owner's Registration card. Do
not attempt to repair the saw yourself,
there are no user serviceable parts
inside.