GMC OS300 Instruction Manual

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1/3 SHEET

ORBITAL
SANDER

OS300
INSTRUCTION MANUAL

Black

Cyan

Magenta

Yellow

Code: OS300 IM

Date: 061010 Edition: 07 Op: PW

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Contents

Warranty Powertools

Whilst every effort is made to ensure your complete
satisfaction with this tool, occasionally, due to the mass
manufacturing techniques, a tool may not live up to our
required level of performance and you may need the
assistance of our service department.

This product is warranted for a 2-year period for home
domestic use from the date of the original purchase.
If found to be defective in materials or workmanship,
the tool or the offending faulty component will be repaired
or replaced free of charge with another of the same item.

A

small freight charge may apply. Proof of purchase is
essential. We reserve the right to reject any claim where
the purchase cannot be verified.

This warranty does not include damage or defects to the
tool caused by or resulting from abuse, accidents,
alterations or commercial or business use. It also does not
cover any bonus items or included accessories. Only the
powertool is covered under this warranty.

With continuing product development, changes may have
occurred which render the product received slightly
different to that shown in this instruction manual.

Please ensure that you store your receipt in a safe place.
Conditions apply to the above warranty. For full details of

the warranty terms and conditions please refer to our
website – www.gmcompany.com

For prompt service we suggest you log your service
request online - www.gmcservice.com.au, should you
not have access to the internet, please contact our
service department on 1300 880 001 (Australia)
or 0800 445 721 (New Zealand).

Warranty 2

Introduction 3

Environmental protection 3

Description of symbols 3

Specifications 3

Safety instructions 4

Additional safety rules for sanders 5

Contents of carton 6

Know your product 7

Unpacking 8

Switching on and off 8

Using the sander 8

Fitting a sanding sheet 8

Selecting the right grade of sandpaper 9

Dust extraction 9

Maintenance 9

General inspection 9

Power cord maintenance 9

3

Description of symbols

The rating plate on your tool may show symbols.
These represent important information about the
product or instructions on its use.

Wear hearing protection.
Wear eye protection.
Wear breathing protection.

Double insulated for additional protection.

Conforms to relevant standards
for electromagnetic compatibility.

Specifications

Voltage: 230–240V ~ 50 Hz

Input power: 300W

No load speed: 12,000 min

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Insulation: Double insulated

Base size: 92 mm x 187 mm

Sandpaper type: Standard 1/3 sheet,
Hook & loop 1/3 sheet

Net weight: 2.2 kg

Sound pressure level: 77.6 dB(A)

Introduction

Your new GMC power tool will more than satisfy
your expectations. It has been manufactured under
stringent GMC Quality Standards to meet superior
performance criteria.

You will find your new tool easy and safe to operate,
and, with proper care, it will give you many years
of dependable service.

CAUTION. Carefully read through this entire Instruction

Manual before using your new GMC Power Tool. Take
special care to heed the Cautions and Warnings.

Your GMC power tool has many features that will make
your job faster and easier. Safety, performance, and
dependability have been given top priority in the
development of this tool, making it easy to maintain
and operate.

Environmental protection

Recycle unwanted materials instead
of disposing of them as waste. All tools,
hoses and packaging should be sorted,
taken to the local recycling centre and
disposed of in an environmentally safe way

.

4

General safety rules

WARNING. Read all instructions. Failure to follow all

instructions listed below may result in electric shock,
fire and/or serious injury. The term “power tool” in all of
the warnings listed below refers to your mains operated
(corded) power tool or battery operated (cordless)
power tool.

Save these instructions

1. Work area
a. Keep work area clean and well lit. Cluttered and dark

areas invite accidents.

b. 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.

c. Keep children and bystanders away while

operating a power tool. Distractions can cause you to

lose control.

2. Electrical safety
a. 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.

b. 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.

c. Do not expose power tools to rain or wet conditions.

Water entering a power tool will increase the risk of
electric shock.

d. 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.

e. 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.

3. Personal safety
a. 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.

b. Use safety equipment. Always wear eye protection.

Safety equipment such as dust mask, non-skid
safety shoes, hard hat, or hearing protection used for
appropriate conditions will reduce personal injuries.

c. Avoid accidental starting. Ensure the switch is in the

off position before plugging in. Carrying power tools with
your finger on the switch or plugging in power tools that
have the switch on invites accidents.

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.

e. Do not overreach. Keep proper footing and balance at

all times. This enables better control of the power tool in
unexpected situations.

f. Dress properly. Do not wear loose clothing or

jewellery. Keep your hair, clothing and gloves away from

moving parts. Loose clothes, jewellery or long hair can be
caught in moving parts.

g. If devices are provided for the connection of dust

extraction and collection facilities, ensure these are
connected and properly used. Use of these devices

can reduce dust related hazards.

4. Power tool use and care
a. 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.

5

b. 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.

c. Disconnect the plug from the power source before

making any adjustments, changing accessories, or
storing power tools. Such preventive safety measures

reduce the risk of starting the power tool accidentally.

d. 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.

e. Maintain power tools. Check for misalignment or

binding of moving parts, breakage of parts and
any other condition that may affect the power tools
operation. If damaged, have the power tool repaired

before use. Many accidents are caused by poorly
maintained power tools.

f. Keep cutting tools sharp and clean. Properly

maintained cutting tools with sharp cutting edges are less
likely to bind and are easier to control.

g. Use the power tool, accessories and tool bits etc.,

in accordance with these instructions and in the
manner intended for the particular type of power
tool, 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.

5. Service
a. 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.

Additional safety rules for sanders

Remove the plug from the socket before carrying out any
adjustment, servicing or maintenance.

• Fully unwind cable drum extensions to avoid

potential overheating.

• When an extension cable is required, you must ensure it

has the right ampere rating for your power tool and is in a
safe electrical condition.

• Ensure your mains supply voltage is the same as your

tool rating plate voltage.

• Your tool is double insulated for additional protection

against a possible electrical insulation failure within
the tool.

• Always check walls, floors and ceilings to avoid hidden

power cables and pipes.

• After long working periods external metal parts and

accessories could be hot.

• Do not force the sander; let the tool do the work at a

reasonable speed. Overloading will occur if too much
pressure is applied and the motor slows resulting in
inefficient sanding and possible damage to the
sander motor.

• When sanding wood, always connect the dust

extraction filter.

• Take special care to guard against harmful and toxic

dusts when sanding lead-based painted surfaces, woods
and metals, including the following:

- All persons entering the work area must wear a mask

specially designed for protection against toxic dust
and fumes such as those arising from the sanding
of lead paint.

- Children and pregnant women must not enter

the work area.

- Do not eat, drink or smoke in the work area.

6

• Before using the sander with metal always remove the

extraction filter from the outlet as sparks may ignite the
dust or the internal bag.

• Do not continue to use worn, torn or heavily clogged

sanding sheets.

• Do not touch the moving sanding sheet.

• Ensure that you have removed foreign objects such

as nails and screws from the work before
commencing sanding.

• Rags, cloths, cord, string and the like should never be left

around the work area.

Wear goggles
Wear ear defenders
Wear a breathing mask

Contents of carton

• 5 x 80 Grit hook & loop sandpaper sheets

• Dust extraction adaptor

• Instruction manual

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Know your product

1. Front handle

2. On/off trigger

3. Lock on button

4. Main handle

5. Soft grip

6. Sandpaper

7. Platen (vibration plate)

8. Paper clamping device

9. Dust extraction port

10. Power cord

11. Dust extraction adaptor

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2

8 7

1

4 5

6

10

9

11

11

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8

Unpacking

Due to modern mass production techniques, it is unlikely
that your GMC Power Tool is faulty or that a part is missing.
If you find anything wrong, do not operate the tool until the
parts have been replaced or the fault has been rectified.
Failure to do so could result in serious personal injury.

Switching on and off

Connect the plug to the
power supply.

Pull the on/off trigger (2) upward
to start the sander. (Fig.A)

Release the trigger to turn off
the sander.

By pulling the trigger on and
pressing the lock on button (3),
you can lock the sander on.
Pulling the switch on again and
releasing it turns the switch off.
(Fig. B)

Using the sander

The sander is designed for
sanding wood, metal, plastic and
similar materials. It can be used
for sanding back and finishing the surface.

This sander is a handy size for medium jobs.

WARNING. Wear safety goggles, a dust mask and

ear defenders.The whole sanding pad must rest on
the workpiece.

Switch the sander on while it is placed on the workpiece
and move it over the surface to be smoothed in a
circular motion.

Grip the main handle (4) in one hand and push down on the
front of the handle with the other hand.

Take care to hold the sander parallel to the work.
Use moderate pressure only.

If there are still marks on your work after sanding, try either
going back to a coarser grade and sanding the marks out
before recommencing with the original choice of grit, or try
using a new piece of sandpaper to eliminate the unwanted
marks before going on to a finer grit and finishing the job.

WARNING. Do not use the sander in wet or

damp conditions.

Fitting a sanding sheet

CAUTION. Switch off the sander and disconnect it from the

power point.
With hook & loop type sanding

sheets, simply press the sheet
to the platen (7), taking care to
align the holes in the sanding
sheet with those in the platen.
(Fig. C)

Ordinary (non-hook & loop type)
sanding sheets can also be
used. Release the clamps (8)
from both sides of the sander.
(Fig. D)

Insert the end of the sandpaper
under the front clamp and pull
the paper tight over the platen
ensuring the holes align with
those in the platen and then
clamp the other end.

The paper should be kept
tightly clamped over the platen, otherwise there could be
excessive wear of the
cushion material.

WARNING. Do not continue to use the sander with a

sanding sheet that is overworn or damaged.

WARNING. Do not use the same sanding sheet for wood

and metal. Metal particles become embedded in the
sandpaper and will scour a wooden surface.

A

B

C

D

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WARNING. Take care to regularly clean out the build up

of dust on the base underneath the sandpaper and not let
the sandpaper wear completely down before replacing it.
Failure to observe these two precautionary measures can
lead to damage to the platen.

Selecting the right grade of sandpaper

Different grades of sanding paper can be purchased from
your local hardware store.
Available grades are: Coarse, Medium and Fine.

Use a coarse grit to sand down rough finishes, medium grit
to smooth the work and fine grit to finish off.

It is best to make a trial run on a scrap piece of material
to determine the optimum grades of sandpaper for a
particular job.

Dust extraction

A vacuum cleaner adaptor can
be used to connect an ordinary
household vacuum cleaner to
the sander.

The adaptor (11) can be fitted
into the dust extraction port (9).
(Fig. E)

Maintenance

WARNING. Always ensure that the tool is switched off and

the plug is removed from the power point before making any
adjustments or maintenance procedures.

Keep the tool’s air vents unclogged and clean at
all times.

Regularly check to see if any dust or foreign matter has
entered the grills near the motor and around the
on/off switch. Use a soft brush to remove any
accumulated dust. Wear safety glasses to protect your
eyes whilst cleaning.

If the body of the tool needs cleaning, wipe it with a soft
damp cloth. A mild detergent can be used but nothing like
alcohol, petrol or other cleaning agent.

Never use caustic agents to clean plastic parts.

CAUTION. Water must never come into contact with

the tool.
Lubricate all moving parts at regular intervals.

General Inspection

Regularly check that all the fixing screws are tight.
They may vibrate loose over time.

Power cord maintenance

If the supply cord needs replacing, the task must be carried
out by the manufacturer, the manufacturer’s agent, or an
authorised service centre in order to avoid a safety hazard.

E

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11

GMC customer assist

If your product needs repairing, replacing,
technical service or you simply need help or advice,
please contact us on our Customer Assist Line
1300 880 001 (Australia) or 0800 445 721 (New Zealand).

For prompt service we suggest you log your service request
online at www.gmcservice.com.au. Should you not have
access to the Internet, please contact our service department
on 1300 880 001 (Australia) or 0800 445 721 (New Zealand).

7am –7pm, 7days a week (AEST).

Please note that if repair or replacement is required,
you must provide a valid original purchase receipt.

You will need the following details at hand to log your service request;

Personal details: First & Last name, address, pick up address,
contact phone numbers, email address

Product details: Product number, date of purchase, retailer bought from,
State & postcode, receipt number, reason for the request,
c

opy of official purchase receipt

Attach your purchase receipt and save with this Manual for future reference

.

Please refer to our website www.gmcompany.com for full GMC warranty Terms and Conditions.