Dremel 750, 770 User guide
Cordless Rotary Tool
Owner’s Manual Models 750 & 770
HONESTLY NOW … Have you read this OWNER’S MANUAL?
•
Safety
• Assembly
•
Operation
•
Accessory Information
•
Warranty
• Registration Form
• Service Parts
2 610 917 153 9/02 PRINTED IN U.S.A.
P.O. Box 1468
Racine, Wisconsin 53401
1-800-437-3635
http://www.dremel.com
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Page 2
General Safety Rules for All Battery Operated Tools
Read and understand all instructions. Failure to follow all instructions listed below, may result
in electric shock, fire and/or serious personal injury.
SAVE THESE INSTRUCTIONS
!
WARNING
Work Area
Keep your work area clean and well lit. Cluttered
benches and 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 bystanders, children, and visitors away while
operating a power tool. Distractions can cause you to
lose control.
Electrical Safety
Do not abuse the cord. Never use the cord to carry the
tool. Keep cord away from heat, oil, sharp edges, or
moving parts. Replace damaged cords immediately.
Damaged cords may create a fire.
A battery operated tool with integral batteries or a
separate battery pack must be recharged only with
the specified charger for the battery. A charger that
may be suitable for one type of battery may create a risk
of fire when used with another battery.
Use battery operated tool only with specifically designated battery pack. Use of any other batteries may
create a risk of fire.
Personal Safety
Stay alert, watch what you are doing, and use common sense when operating a power tool. Do not use
tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while
operating power tools may result in serious personal
injury.
Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, clothing, and
gloves away from moving parts. Loose clothes, jewel-
ry, or long hair can be caught in moving parts.
Avoid accidental starting. Be sure switch is in the
locked or off position before inserting battery pack.
Carrying tools with your finger on the switch or inserting the battery pack into a tool with the switch on invites
accidents.
Remove adjusting keys or wrenches before turning
the tool on. A wrench or a key that is left attached to a
rotating part of the tool may result in personal injury.
Do not overreach. Keep proper footing and balance at
all times. Proper footing and balance enable better
control of the tool in unexpected situations.
Use safety equipment. Always wear eye protection.
Dust mask, non-skid safety shoes, hard hat, or hearing
protection must be used for appropriate conditions.
Tool Use and Care
Use clamps or other practical way to secure and support the workpiece to a stable platform. Holding the
work by hand or against your body is unstable and may
lead to loss of control.
Do not force tool. Use the correct tool for your application. The correct tool will do the job better and safer
at the rate for which it is designed.
Do not use tool if switch does not turn it on or off. A
tool that cannot be controlled with the switch is dangerous and must be repaired.
Disconnect battery pack from tool or place the switch
in the locked or off position before making any adjustments, changing accessories, or storing the tool.
Such preventive safety measures reduce the risk of
starting the tool accidentally.
Store idle tools out of reach of children and other
untrained persons. Tools are dangerous in the hands of
untrained users.
When battery pack is not in use, keep it away from
other metal objects like: paper clips, coins, keys,
nails, screws, or other small metal objects that can
make a connection from one terminal to another.
Page 3
Safety Rules for Cordless Rotary Tools
Shorting the battery terminals together may cause
sparks, burns, or a fire.
Maintain tools with care. Keep cutting tools sharp and
clean. Properly maintained tools with sharp cutting
edge are less likely to bind and are easier to control.
Check for misalignment or binding of moving parts,
breakage of parts, and any other condition that may
affect the tool's operation. If damaged, have the tool
serviced before using. Many accidents are caused by
poorly maintained tools.
Use only accessories that are recommended by the
manufacturer for your model. Accessories that may be
suitable for one tool may create a risk of injury when
used on another tool.
Service
Tool service must be performed only by qualified
repair personnel. Service or maintenance performed
by unqualified personnel may result in a risk of injury.
When servicing a tool, use only identical replacement
parts. Follow instructions in the Maintenance section
of this manual. Use of unauthorized parts or failure to
follow Maintenance Instructions may create a risk of
shock or injury.
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.
Hold tool 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. If cutting into existing walls or other
blind areas where electrical wiring may exist is unavoidable, disconnect all fuses or circuit breakers feeding this
worksite.
Before changing accessories remove battery pack.
Accidental starting may occur because battery tools
with a battery inserted are in the operative condition.
Be aware of the switch location, when placing the tool
down or when picking the tool up. You may acciden-
tally activate the switch.
Always hold the tool with two hands during start-up.
The reaction torque of the motor can cause the tool to
twist.
Always wear safety goggles and dust mask. Use only
in well ventilated area. Using personal safety devices
and working in safe environment reduces risk of injury.
After changing the bits or making any adjustments,
make sure the collet nut and any other adjustment
devices are securely tightened. Loose adjustment
device can unexpectedly shift, causing loss of control,
loose rotating components will be violently thrown.
Do not reach in the area of the spinning bit. The proximity of the spinning bit to your hand may not always be
obvious.
Allow brushes to run at operating speed for at least
one minute before using wheel. During this time no
one is to stand in front or in line with the brush. Loose
bristles or wires will be discharged during the run-in
time.
Wire and bristle brushes must never be operated at
speeds greater than 15,000/min. Direct the discharge
of the spinning wire brush away from you. Small par-
ticles and tiny wire fragments may be discharged at
high velocity during the “cleaning” action with these
brushes and may become imbedded in your skin.
Bristles or wires will be discharged from the brush at
high speeds.
"Wear protective gloves and face shield with wire or
bristle brushes. Apply wire or bristle brushes lightly
to the work as only the tips of the wire/bristles do the
work. “Heavy” pressure on bristles will cause the wire
or bristle to become overstressed, resulting in a wiping
action and will cause the bristles/wire to be discharged."
Carefully handle both the tool and individual grinding
wheels to avoid chipping or cracking. Install a new
wheel if tool is dropped while grinding. Do not use a
wheel that may be damaged. Fragments from a wheel
that bursts during operation will fly away at great velocity possibly striking you or bystanders.
Never use dull or damaged bits. Sharp bits must be
handled with care. Damaged bits can snap during use.
Page 4
Dull bits require more force to push the tool, possibly
causing the bit to break.
Use clamps to support workpiece whenever practical.
Never hold a small workpiece in one hand and the
tool in the other hand while in use. Allow for sufficient
space, at least 6", between your hand and the spinning bit. Round material such as dowel rods, pipes or
tubing have a tendency to roll while being cut, and may
cause the bit to “bite” or jump toward you. Clamping a
small workpiece allows you to use both hands to control the tool.
Inspect your workpiece before cutting. When cutting
irregularly shaped workpieces, plan your work so it
will not slip and pinch the bit and be torn from your
hand. For example, if carving wood, make sure there
are no nails or foreign objects in the workpiece. Nails or
foreign objects can cause the bit to jump.
Never start the tool when the bit is engaged in the
material. The bit cutting edge may grab the material
causing loss of control of the cutter.
Avoid bouncing and snagging the wheel, especially
when working corners, sharp edges etc. This can
cause loss of control and kick-back.
The direction of feed with the bit into the material
when carving, routing or cutting is very important.
Always feed the bit into the material in the same
direction as the cutting edge is exiting from the material (which is the same direction as the chips are
thrown). Feeding the tool in the wrong direction, caus-
es the cutting edge of the bit to climb out of the work
and pull the tool in the direction of this feed.
If the workpiece or bit becomes jammed or bogged
down, turn the tool “OFF” by the switch. Wait for all
moving parts to stop and unplug the tool, then work to
free the jammed material. If the switch to the tool is
left “ON” the tool could restart unexpectedly causing
serious personal injury.
Do not leave a running tool unattended, turn power
off. Only when tool comes to a complete stop it is safe
to put it down.
Do not grind or sand near flammable materials.
Sparks from the wheel could ignite these materials.
Do not touch the bit or collet after use. After use the bit
and collet are too hot to be touched by bare hands.
Regularly clean the tool's air vents by compressed
air. Excessive accumulation of powdered metal inside
the motor housing may cause electrical failures.
Do not allow familiarity gained from frequent use of
your rotary tool to become commonplace. Always
remember that a careless fraction of a second is sufficient to inflict severe injury.
Do not alter or misuse tool. Any alteration or modification is a misuse and may result in serious personal
injury.
This product is not intended for use as a dental drill,
in human or veterinary medical applications.
Serious injury may result.
When using the steel saws, cutoff wheels, high speed
cutters or tungsten carbide cutters, always have the
work securely clamped. Never attempt to hold the
work with one hand while using any of these accessories. The reason is that these wheels will grab if they
become slightly canted in the groove, and can kickback
causing loss of control resulting in serious injury. Your
second hand should be used to steady and guide the
hand holding the tool. When a cutoff wheel grabs, the
wheel itself usually breaks. When the steel saw, high
speed cutters or tungsten carbide cutter grab, it may
jump from the groove and you could lose control of the
tool.
Some dust created by power
sanding, sawing, grinding,
drilling, and other construction activities contains
chemicals known to cause cancer, birth defects or
other reproductive harm. Some examples of these
chemicals are:
• Lead from lead-based paints,
• Crystalline silica from bricks and cement and other
masonry products, and
• Arsenic and chromium from chemically-
treated lumber.
Your risk from these exposures varies, depending on
how often you do this type of work. To reduce your
exposure to these chemicals: work in a well ventilated
area, and work with approved safety equipment, such
as those dust masks that are specially designed to
filter out microscopic particles.
!
WARNING
Page 5
Before using battery charger, read all instructions and
cautionary markings on (1) battery charger, (2) battery pack, and (3) product using battery.
Use only the charger which accompanied your
product or direct replacement as listed in the
catalog or this manual. Do not substitute any other
charger. Use only Dremel battery charger Nos. 756-01
& 758-01 with your product.
Do not disassemble charger or operate the charger if
it has received a sharp blow, been dropped or otherwise damaged in any way. Replace damaged cord or
plugs immediately. Incorrect reassembly or damage
may result in electric shock or fire.
Do not recharge battery in damp or wet environment.
Do not expose charger to rain or snow. If battery case
is cracked or otherwise damaged, do not insert into
charger. Battery short or fire may result.
Charge only Dremel Nos. 755-01 & 757-01 rechargeable batteries with the above listed chargers. Other
types of batteries may burst causing personal injury and
damage.
Charge battery pack in temperatures above +40
degrees F (4 degrees C) and below +105 degrees F
(41 degrees C). Store tool and battery pack in locations where temperatures will not exceed 120
degrees F (49 degrees C). This is important to prevent
serious damage to the battery cells.
Battery leakage may occur under extreme usage or
temperature conditions. Avoid contact with skin and
eyes. The battery liquid is caustic and could cause
chemical burns to tissues. If liquid comes in contact
with skin, wash quickly with soap and water, then with
lemon juice or vinegar. If the liquid contacts your eyes,
flush them with water for a minimum of 10 minutes and
seek medical attention.
Use of an attachment not recommended or sold by
Dremel may result in a risk of fire, electric shock or
injury to persons.
Battery Care
When batteries are not in tool or
charger, keep them away from
metal objects. For example, to protect terminals from
shorting DO NOT place batteries in a tool box or pocket
with nails, screws, keys, etc. Fire or injury may result.
DO NOT PUT BATTERIES INTO FIRE OR EXPOSE TO
HIGH HEAT. They may explode.
Battery Disposal
Do not attempt to disassemble
the battery or remove any com-
ponent projecting from the battery terminals. Fire or
injury may result. Prior to disposal, protect exposed terminals with heavy insulating tape to prevent shorting.
Nickel-Cadmium Batteries
If equipped with a nickel-cadmium battery, the battery
must be collected, recycled or disposed of in an
environmentally sound manner.
“The EPA certified RBRC Battery
Recycling Seal on the nickel-cadmium (Ni-Cd) battery indicates S-B
Power Tool Company is voluntarily
participating in an industry pro-
gram to collect and recycle these
batteries at the end of their useful life, when taken out
of service in the United States or Canada. The RBRC
program provides a convenient alterative to placing
used Ni-Cd batteries into the trash or the municipal
waste stream, which may be illegal in your area.
Please call 1-800-8-BATTERY for information on Ni-Cd
battery recycling and disposal bans/restrictions in
your area, or return your batteries to a
Skil/Bosch/Dremel Service Center for recycling. S-B
Power Tool Company’s involvement in this program is
part of our commitment to preserving our environment and conserving our natural resources.”
Nickel-Metal Hydride Batteries
If equipped with a nickel-metal hydride battery, the battery can be disposed of in a municipal solid waste
stream.
!
WARNING
!
WARNING
Battery/Charger
Page 6
IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their
meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.
Symbol Name Designation/Explanation
V Volts Voltage (potential)
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watt Power
kg Kilograms Weight
min Minutes Time
s Seconds Time
Diameter Size of drill bits, grinding wheels, etc.
n
0
No load speed Rotational speed, at no load
.../min Revolutions or reciprocation per minute Revolutions, strokes, surface speed,
orbits etc. per minute
0 Off position Zero speed, zero torque...
1, 2, 3, ... Selector settings Speed, torque or position settings.
I, II, III, Higher number means greater speed
Infinitely variable selector with off Speed is increasing from 0 setting
Arrow Action in the direction of arrow
Alternating current Type or a characteristic of current
Direct current Type or a characteristic of current
Alternating or direct current Type or a characteristic of current
Class II construction Designates Double Insulated Construction tools.
Earthing terminal Grounding terminal
Warning symbol Alerts user to warning messages
Ni-Cad RBRC seal Designates Ni-Cad battery recycling program
Symbols
0
Page 7
Symbols
IMPORTANT: Some of the following symbols may be used on your tool. Please study them and learn their
meaning. Proper interpretation of these symbols will allow you to operate the tool better and safer.
This symbol designates
that this tool is listed by
Underwriters Laboratories.
This symbol designates that
this tool is listed by the
Canadian Standards
Association.
This symbol designates that this
tool is listed to Canadian
Standards by Underwriters
Laboratories.
This symbol
designates that
this tool
complies
to NOM
Mexican
Standards.
This symbol designates that this
tool is listed by Underwriters
Laboratories, and listed to
Canadian Standards by
Underwriters Laboratories.
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