master mechanic 152294 User manual

1.3A Rotary Tool
152294
Owner’s Manual
PRODUCT SPECIFICATIONS
Rating:
120V AC, 60 Hz
Amperes:
1.3A
RPM:
10,000–35,000 RPM (no load)
Collet:
1/16", 3/32 & 1/8" (1.6, 2.4 & 3.2 mm)
Weight:
1 lb 6 oz (0.68 kg)
Need Assistance?
Call us on our toll free customer support line:
1-866-349-8665 Monday –Friday from 9am to 5pm
Eastern Standard Time
Technical questions
Replacement parts
Parts missing from package
Manufactured For and Distributed By
True Value® Company, Chicago, IL
©2012 True Value Company
Made in China

2
Product specifications ………….…………………………………………………….
1
Table of contents ……………………………………………………………………...
2
General safety warnings ……………………………………………………………..
3–4
Eye, ear & lung protection ……………………………………………………………
3–4
Electrical safety ……………………………………………………………………….
4
Power tool safety ……………………………………………………………………...
5–6
General safety rules …………………………………………………………………..
5
Work area ………………………………………………………………….................
5
Electrical safety ……………………………………………………………………….
5
Personal safety ………………………………………………………………………..
5–6
Tool use and care …………………………………………………………………….
6
Service …………………………………………………………………………………
6
Specific safety rules …………………………………………………………………..
7
Extension cord safety ………………………………………………………………...
8
Symbols ………………………………………………………………………………..
9
Know your rotary tool …………………………………………………………………
10
Accessories ……………………………………………………………………………
11
Contents………………………………………………………………………………..
11–15
Accessory description & use ………………………………………………………...
16–17
Assembly and operation ……………………………………………………………..
17–23
Variable speed control ………………………………………………………………..
17
ON / OFF switch ………………………………………………………………………
18
Changing the collet …………………………………………………………………...
18–19
Installing accessories ………………………………………………………………..
19
Connecting the flexible shaft to the tool …………………………………………….
20–21
Changing the collet & accessories in the flexible shaft …………………………...
21
Assembling & installing the stand …………………………………………………...
21–22
Selecting proper speeds …………….……………………………………………….
23
Maintenance …………………………………………………………………………..
24
Parts diagram ………………………………………………………………………….
25
Parts list ………………………………………………………………………………..
26
Warranty ……………………………………………………………………….………
27
TABLE OF CONTENTS

3
EYE, EAR & LUNG PROTECTION
GENERAL SAFETY WARNINGS
WARNING: Before using this tool or any of its accessories, read this
manual and follow all Safety Rules and Operating Instructions. The important
precautions, safeguards and instructions appearing in this manual are not
meant to cover all possible situations. It must be understood that common
sense and caution are factors which cannot be built into the product.
!
This instruction manual includes the following:
General Safety Rules
Specific Safety Rules and Symbols
Functional Description
Assembly
Operation
Maintenance
Accessories
!
ALWAYS WEAR EYE PROTECTION THAT CONFORMS WITH CSA
REQUIREMENTS or ANSI SAFETY STANDARD Z87.1
FLYING DEBRIS can cause permanent eye damage. Prescription
eyeglasses ARE NOT a replacement for proper eye protection.
WARNING: Non-compliant eyewear can cause serious injury if
broken during the operation of a power tool.
SAVE THESE INSTRUCTIONS FOR REFERENCE
WARNING: Use hearing protection, particularly during extended
periods of operation of the tool, or if the operation is noisy.
!

4
ELECTRICAL SAFETY
GENERAL SAFETY WARNINGS
WEAR A DUST MASK THAT IS DESIGNED TO BE USED WHEN
OPERATING A POWER TOOL IN A DUSTY ENVIRONMENT.
WARNING: Dust that is created by power sanding, sawing, grinding,
drilling, and other construction activities may contain chemicals that are
known to cause cancer, birth defects, or other genetic abnormalities. These
chemicals include:
Lead from lead-based paints
Crystalline silica from bricks, cement, and other masonry products
Arsenic and chromium from chemically treated lumber
The level of risk from exposure to these chemicals varies, according to how
often this type of work is performed. In order to reduce exposure to these
chemicals, work in a well-ventilated area, and use approved safety
equipment, such as a dust mask that is specifically designed to filter out
microscopic particles.
!
WARNING: To avoid electrical hazards, fire hazards or damage to the
tool, use proper circuit protection.
This tool is wired at the factory for 120V AC operation. It must be connected
to a 120V AC, 15AMP circuit that is protected by a time-delayed fuse or
circuit breaker. To avoid shock or fire, replace power cord immediately if it
is worn, cut or damaged in any way.

5
WARNING: Read all safety warnings
and instructions. Failure to follow the
warnings and instructions may result in
electric shock, fire and/or serious injury.
Save all warnings and instructions for
future reference.
Work area safety
Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
Do not operate power tools in explosive
atmospheres, such as in the presence
of flammable liquids, gases or dust.
Power tools create sparks which may
ignite the dust or fumes.
Keep children and bystanders away
while operating a power tool.
Distractions can cause you to lose control.
Electrical safety
Power tool plugs must match the outlet.
Never modify the plug in any way. Do
not use any adapter plugs with earthed
(grounded) power tools. Unmodified
plugs and matching outlets will reduce risk
of electric shock.
Avoid body contact with earthed or
grounded surfaces such as pipes,
radiators, ranges and refrigerators.
There is an increased risk of electric shock
if your body is earthed or grounded.
Do not expose power tools to rain or
wet conditions. Water entering a power
tool will increase the risk of electric shock.
Do not abuse the cord. Never use the
cord for carrying, pulling or unplugging
the power tool. Keep cord away from
heat, oil, sharp edges or moving parts.
Damaged or entangled cords increase the
risk of electric shock.
When operating a power tool outdoors,
use an extension cord suitable for
outdoor use. Use of a cord suitable for
outdoor use reduces the risk of electric
shock.
If operating a power tool in a damp
location is unavoidable, use a residual
current device (RCD) protected supply.
Use of a ground fault circuit interrupter
(GFCI) reduces the risk of electric shock.
Personal safety
Stay alert, watch what you are doing
and use common sense when operating
a power tool. Do not use a power tool
while you are tired or under the
influence of drugs, alcohol or
medication. A moment of inattention while
operating power tools may result in serious
personal injury.
Use personal protective equipment.
Always wear eye protection. Protective
equipment such as dust mask, non-skid
safety shoes, hard hat, or hearing
protection used for appropriate conditions
will reduce personal injuries.
Prevent unintentional starting. Ensure
the switch is in the off-position before
connecting to power source and/or
battery pack, picking up or carrying the
tool. Carrying power tools with your finger
on the switch or energizing power tools
that have the switch on invites accidents.
POWER TOOL SAFETY
!

6
PERSONAL SAFETY –cont’d
Remove any adjusting key or wrench
before turning the power tool on. A
wrench or a key left attached to a rotating
part of the power tool may result in
personal injury.
Do not overreach. Keep proper footing
and balance at all times. This enables
better control of the power tool in
unexpected situations.
Dress properly. Do not wear loose
clothing or jewelry. Keep your hair,
clothing and gloves away from moving
parts. Loose clothes, jewelry or long hair
can be caught in moving parts.
If devices are provided for the
connection of dust extraction and
collection facilities, ensure these are
connected and properly used. Use of
dust collection can reduce dust-related
hazards.
Power tool use and care
Do not force the power tool. Use the
correct power tool for your application.
The correct power tool will do the job
better and safer at the rate for which it was
designed.
Do not use the power tool if the switch
does not turn it on and off. Any power
tool that cannot be controlled with the
switch is dangerous and must be repaired.
Disconnect the plug from the power
source and/or the battery pack from the
power tool before making any
adjustments, changing accessories, or
storing power tools. Such preventive
safety measures reduce the risk of starting
the power tool accidentally.
Store idle power tools out of the reach
of children and do not allow persons
unfamiliar with the power tool or these
instructions to operate the power tool.
Power tools are dangerous in the hands of
untrained users.
Maintain power tools. Check for
misalignment or binding of moving
parts, breakage of parts and any other
condition that may affect the power
tool’s operation. If damaged, have the
power tool repaired before use. Many
accidents are caused by poorly maintained
power tools.
Keep cutting tools sharp and clean.
Properly maintained cutting tools with
sharp cutting edges are less likely to bind
and are easier to control.
Use the power tool, accessories and
tool bits etc. in accordance with these
instructions, taking into account the
working conditions and the work to be
performed. Use of the power tool for
operations different from those intended
could result in a hazardous situation.
Hold power tools by insulated gripping
surfaces when performing an operation
where the cutting tool may contact
hidden wiring or its own cord. Contact
with a "live" wire will make exposed metal
parts of the tool "live" and shock the
operator.
Service
Have your power tool serviced by a
qualified repair person using only
identical replacement parts. This will
ensure that the safety of the power tool is
maintained.
POWER TOOL SAFETY

7
SPECIFIC SAFETY RULES
Hold the tool by its insulated gripping
surfaces when performing an operation
where the cutting tool may contact hidden
wiring or its own cord. Contact with a "live"
wire will make exposed metal parts of the
tool "live" and shock the operator.
Always make sure the work surface is free
from nails and other foreign objects.
Cutting into a nail can cause the bit and
the tool to jump and damage the bit.
Never hold the workpiece in one hand and
the tool in the other hand when in use.
Never place the hands near or below the
cutting surface. Clamping the material and
guiding the tool with both hands is much
safer.
Never lay the workpiece on hard surfaces
like concrete, stone, etc. The protruding
cutting bit may cause tool to jump.
Always wear safety goggles and a dust
mask. Use only in well-ventilated areas.
Using personal safety devices and working
in a safe environment reduces risk of
injury.
After changing the bits and accessories or
making adjustments, make sure the collet
nut and any other adjustment devices are
securely tightened. Loose adjustment
devices will be violently thrown.
Always use the correct collet size. If the
collet size is larger than the accessory
shank size it will not grip the shank
properly, leading to possible injury to the
operator or damage to the tool.
Always check accessory bits, grinding
stones, cut-off wheels etc. for damage
before each use. Damaged accessories
can break during use and cause serious
injury.
Never use dull or damaged bits. Sharp bits
must be handled with care. Damaged bits
can snap during use. Dull bits require more
force to push the tool, possibly causing the
bit to break.
Never touch the bit during or immediately
after use. After use the bit is too hot to be
touched by bare hands.
Accessories must be rated for at least
the speed recommended on the tool
warning label. Wheels and other
accessories running over rated speed can
fly apart and cause injury.
SPECIFIC SAFETY RULES

8
WARNING: Keep the extension cord
clear of the working area. Position the
cord so it will not get caught on the
workpiece, tools or any other obstructions
while you are working with the power tool.
Make sure any extension cord used with
this tool is in good condition. When using
an extension cord, be sure to use one of
heavy enough gauge to carry the current
the tool will draw. An undersized cord will
cause a drop in line voltage resulting in
loss of power and overheating.
The table at right shows the correct size to
use according to cord length and
nameplate ampere rating. If in doubt, use
the next heavier gauge. The smaller the
gauge number the heavier the cord.
Be sure your extension cord is properly
wired and in good condition. Always
replace a damaged extension cord or have
it repaired by a qualified electrician before
using it. Protect your extension cord from
sharp objects, excessive heat and damp or
wet areas.
Use a separate electrical circuit for your
power tools. This circuit must not be less
than 14 gauge wire and should be
protected with either a 15 A time delayed
fuse or circuit breaker. Before connecting
the power tool to the power source, make
sure the switch is in the OFF position and
the power source is the same as indicated
on the nameplate. Running at lower
voltage will damage the motor.
!
EXTENSION CORD SAFETY
MINIMUM GAUGE (AWG)
EXTENSION CORDS (120V use only)
Amperage
rating
Total length
More
than
Not
more
than
25'
(7.5 m)
50'
(15 m)
100'
(30 m)
150'
(45 m)
0
6
18
16
16
14
6
10
18
16
14
12
10
12
16
16
14
12
12
16
14
12
Not Applicable

9
This symbol designates that this tool is
listed with U.S. requirements by
ETL Testing Laboratories, Inc.
Conforms to UL Std. 60745-1, 60745-2-3
3042597
S1J-160CU
LISTED
V
volts
A
amperes
Hz
hertz
W
watt
kW
kilowatts
microfarads
L
liters
kg
kilograms
H
hours
N/cm2
newtons per square
centimeter
Pa
pascals
Min
minutes
S
seconds
alternating current
three-phase alternating
current
three-phase alternating
current with neutral
direct current
no load speed
alternating or direct
current
class II construction
splash proof
construction
watertight construction
protective earthing at
earthing terminal, Class I
tools
revolutions or
reciprocations per
minute
diameter
off position
arrow
warning symbol
SYMBOLS
WARNING: Some of the following symbols may appear on the rotary
tool. Study these symbols and learn their meaning. Proper interpretation of
these symbols will allow for more efficient and safer operation of this tool.
!

10
KNOW YOUR ROTARY TOOL
Variable speed
control dial
Collet nut
Spindle lock
button
ON/OFF switch
Hanging loop
Brush cap
Umbrella
nut

11
AVAILABLE ACCESSORIES
WARNING: Use only accessories
recommended for this rotary tool.
Follow instructions that accompany the
accessories. Improper use of
accessories may cause injury to the
operator or damage to the rotary tool.
Do not use any accessory unless you have
completely read the instructions or
Owner’s Manual for that accessory.
NOTE: Most commonly used bits and
accessories with 1/8" and 3/32" shanks will
fit this tool. Rotary tool accessories such
as a drill press designed for other rotary
tools may not fit this tool.
WARNING: If any part is missing
or damaged, do not plug the rotary tool
into the power source until the missing
or damaged part is replaced.
CARTON CONTENTS
Carefully unpack the rotary tool. Compare
against the “Rotary Tool Components”
chart below.
NOTE: See illustration of rotary tool
accessories on Pages 13, 14 & 15.
WARNING: To avoid fire or toxic
reaction, never use gasoline, naphtha,
acetone, lacquer thinner or similar
highly volatile solvents to clean the
tool.
!
!
!
ACCESSORIES & CONTENTS
ROTARY TOOL COMPONENTS
KEY
DESCRIPTION
QTY
A
Rotary tool
1
B
Blow molded case
1
C
General purpose
accessory kit (see
Pages 13, 14 & 15 for
contents)
1
D
C-clamp
1
E
Stand
1
F
Flexible shaft
1
Owner’s manual
1

12
CONTENTS

13
ACCESSORY KIT CONTENTS
Illustration
Description
Shape
Qty
Aluminum oxide
grinding stone
3/8” Radial
2
Aluminum oxide
grinding stone
5/8” Radial
2
Aluminum oxide
grinding stone
Parabolic 3/8”
2
Aluminum oxide
grinding stone
Abrasive wheel 3/4”
3
Silicon carbide
grinding stone
3/8” Radial
2
Silicon carbide
grinding stone
5/8”
2
Silicon carbide wheel
Abrasive wheel 3/4“
3
Grinding disc
7/8”
1
Heavy duty cut-off
wheel
15/16” x 0.031” thick
20
Bristle brush
1/2” Axial
1
Bristle brush
1/4” Axial
1
Stainless steel brush
1/2 ” Axial
1
Brass brush
3/4” Radial
1

14
ACCESSORY KIT CONTENTS
Illustration
Description
Shape
Qty
Brass brush
1/2” Axial
1
Brass brush
1/4” Axial
1
Felt polishing
wheel
1/2”
4
Felt polishing
wheel
1”
1
Felt polishing tip
3/8” Pointed tip
1
Cloth wheel
1”
1
Rubber polishing
wheel
7/8”
1
Sanding band
1/4” 60 grit
4
Sanding band
1/4” 120 grit
4
Sanding band
1/2” 60 grit
4
Sanding band
1/2” 120 grit
4
Drum sander
¼” with 1/8”
shank for ¼”
sanding band
1
Drum sander
½” with 1/8”
shank for ½”
sanding band
1
Flapwheel
13/16” Radial
1
Diamond point
1/8”
1
Diamond point
5/64” Ball
1

15
ACCESSORY KIT CONTENTS
Illustration
Description
Shape
Qty
Diamond point
5/32” Ball
1
Diamond point
3/64” Taper
1
Diamond point
3/16” Cylinder
1
HSS cutter
1/8” Cylinder
1
HSS cutter
Point
1
Diamond point
1/16” Cylinder
1
Multi-purpose bit
1/8” Cylinder
2
Multi-purpose bit
3/32” Cylinder
4
Multi-purpose bit
1/16” Cylinder
4
Collet
1/8”
2
One
on
tool
Collet
3/32”
1
Collet
1/16”
1
Screw mandrel
1/8”
2
Mandrel
1/8” for felt
wheels
1
Wrench
For collet nut,
drum sander
1
Dressing stone
3/8 x 3/8 x 1”
square
1

16
ACCESSORY DESCRIPTION & USE
NOTE: Not all accessories listed below are included with this tool. Please refer
to Pages 13, 14 & 15 for a listing of those accessories included with this tool.
Accessory Description
Accessory Use
Aluminum oxide (pink)
Grinding stones
Grinding wheels
Abrasive wheels
Use on metals, castings, welded joints, rivets and
rust. Ideal for sharpening, de-burring, rust removal
and general-purpose grinding of most materials.
High-speed steel cutter
For shaping, hollowing, grooving, slotting and
making tapered holes in soft metals, plastics and
woods.
Cut-off wheel
Ideal for cutting, grooving and trimming all kinds of
materials—including metal, wood and ceramics.
You can use it to cut screws and rusted bolts,
make slots in screw heads, trim castings and
more.
Polishing wheel
Felt, cloth & rubber
Ideal for polishing most metal surfaces and
plastics. Can be used with polishing compound.
Bristle brush
Use for light de-burring, cleaning and polishing of
silverware, jewellery and other precious metals.
Can be used with polishing compound.
Brass brush
Brass brushes are non-sparking and softer than
steel. They will not scratch soft metals like gold,
copper, brass, etc.
Multi-purpose bit
Cuts wood, plastic, fibreglass, drywall, laminate,
aluminum and vinyl siding.
Sanding band
For rough shaping and smoothing wood and
fibreglass; removing rust from metal surfaces;
shaping rubber surfaces. Sanding bands are
easily replaceable on drums.
Sanding wheel
Ideal for rough-shaping and smoothing wood and
fibreglass—as well as removing rust from metal
surfaces, shaping rubber surfaces and more.
Screw mandrel
Use with sanding discs, felt wheels, polishing,
grinding and cut-off wheels.
Mandrel for cloth wheel
Use with sanding discs and polishing, grinding
and cut-off wheels.
Collet
For use with accessories.
Collet wrench
For tightening & loosening collet nut, screw of
drum sanders.
Dressing stone
Cleans grinding wheels and stones. Shapes or
reshapes stones for desired applications.
Silicon carbide (green)
Stones
Wheels
Designed to work well on stone, glass, ceramics,
porcelain and non-ferrous metals.
Polishing wheel
Emery-impregnated
Ideal for cleaning and polishing coarse surfaces.

17
VARIABLE SPEED CONTROL
Set rotary tool speed by rotating the
variable speed control dial (1) to the
appropriate speed (Fig. 1). Position speed
control dial at "1" for slowest speed, "3" for
medium speed and at "MAX" for the
highest speed.
ASSEMBLY AND OPERATION
NOTE: This rotary tool will accept all 1/8" and 3/32" shanked accessories offered by
leading brands, however, attachments such as drill press stands etc. may not be
compatible. Please consult your retailer before purchasing.
ACCESSORY DESCRIPTION & USE
Fig. 1
Accessory Description
Accessory Use
Stainless steel brush
Stainless steel brushes do not cause "after-rust"
when used on corrosive-resistant materials like
pewter, aluminum and stainless steel.
Mandrel for emery-impregnated
polishing wheel
Use with emery-impregnated polishing wheel.
Carbide grout cutter
Ideal for use on wall and floor grout.
Flap wheel
Flap wheels grind and polish flat or contoured
surfaces. They are used most effectively to finish
a surface after heavier sanding and material
removal have been completed.
Diamond wheel point
Great for cutting, sawing and carving of hard
materials such as marble, concrete, brick,
porcelain, ceramics, hard epoxy and soft and hard
wood.
Engraving Cutter
For detail engraving, carving and routing in wood,
fibreglass, plastic and soft metals.
Tungsten-carbide cutter
Use for shaping, smoothing and material removal.
Use on hardened steel, stainless steel, cast iron,
nonferrous metals, fired ceramics, plastics, hard
woods and other hard materials.
NOTE: The drawings in the
assembly and operating section of
this manual may differ slightly from
the tool you purchased.

18
ON/OFF SWITCH
To turn the switch ON, push on the lower
part of the ON/OFF switch (1) (Fig. 2). To
turn the switch OFF, push on the upper
part of the ON/OFF switch (2).
CHANGING THE COLLET
Some accessories require the use of
different sized collets. Collet sizes can be
1/16", 3/32" and 1/8". It is important to
ensure that the collet size matches the
accessory.
NOTE: This tool includes all three of these
collets: 1/16", 3/32" and 1/8".
Using a collet that is too large for the
accessory will result in the accessory
possibly being thrown from the tool
causing serious injury.
1. Turn the tool switch OFF and remove
the plug from the power source.
2. Depress the spindle lock button (1)
and slowly turn the collet nut (2) until
the spindle lock button locks the
spindle (Fig. 3).
3. While holding the spindle lock button
down, turn the collet nut counter
clockwise until it is removed.
4. Remove the collet (3) by pulling it out
of the spindle (4).
5. Insert the replacement collet into the
spindle and replace the collet nut by
turning it clockwise while holding the
spindle lock button down.
ASSEMBLY AND OPERATION
Fig. 2
Fig. 3

19
CHANGING THE COLLET –cont’d
NOTE: Do not tighten the collet nut without
an accessory installed in the collet. You
will damage the collet.
INSTALLING ACCESSORIES
1. Turn the switch OFF and disconnect
the tool from the power source.
2. Depress the spindle lock button (1)
and slowly turn the collet nut (2) until
the spindle lock button locks the
spindle (Fig. 4).
3. While holding the spindle lock button
down, turn the collet nut counter
clockwise until the collet is loose
inside the collet nut.
4. Insert accessory (3) into collet.
NOTES:
a) Make sure the correct collet is used
for the accessory. If collet is too large,
replace the collet with the next smaller
size.
b) Insert accessory at least ¾” into the
collet.
5. Press the spindle lock button and
engage it in the spindle. While holding
the spindle lock button down, hand-
tighten the collet by turning it
clockwise.
NOTE: Do not use pliers to tighten the
collet nut. Use the small wrench (4)
supplied. Over tightening will cause
damage to the tool.
6. Pull on the accessory to ensure it is
securely in place.
ASSEMBLY AND OPERATION
Fig. 4

20
CONNECTING THE FLEXIBLE SHAFT
TO THE TOOL
The flexible shaft is designed to facilitate
working in confined spaces where
otherwise using the rotary tool may be
awkward.
WARNING: Never bend the
flexible shaft with a radius of less than
6” when operating. Store the flexible
shaft in the designated compartment of
the blow molded case when not in use.
1. Remove umbrella nut (1) from the tool
by turning it counter-clockwise (Fig. 5).
2. Before replacing collet nut, check to
make sure the 1/8” collet is installed in
the motor shaft.
NOTES:
a) To change collet, see Fig. 3.
b) Do not tighten collet nut on collet.
3. Pull flexible shaft inner cable (2) out of
the outer casing (3) about 2”.
4. Insert flexible shaft inner cable into the
collet until the stopper (4) touches the
collet.
5. Tighten collet nut (see Fig. 4).
NOTE: Do not use pliers to tighten the
collet nut. Use the small wrench
supplied. Over tightening will cause
damage to the tool.
Slide flexible shaft outer casing over the
collet nut until casing rests against the
threaded spindle (5).
NOTE: DO NOT force the outer casing. If
the outer casing will not easily slide over
the inner cable, turn the collet on the
opposite end of the flexible shaft until the
resistance of the inner cable ceases.
ASSEMBLY AND OPERATION
!
Fig. 5