INSTRUCTION MANUAL
1/4 Sheet
Palm Sander
• Melbourne • Perth • Auckland • Hong Kong • Shanghai
SA146
• Taipei • New York • Verona • London • Paris
050525 ED3 CH
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Description of symbols
Dear Customer
The rating plate on your tool may show symbols. These
represent important information about the product or
instructions on its use.
If you require any help with your product, whether it
is a Warranty claim, spare part or user information,
please phone our Help Line for an immediate response.
Phone 1300 880 001 in Australia or 0800 445 721 in
New Zealand.
Wear hearing protection.
Wear eye protection.
Wear breathing protection.
Introduction
Double insulated
for additional protection.
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.
Conforms to relevant standards for
electromagnetic compatibility.
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.
Specifications
Voltage:
230-240V ~ 50Hz
240W
12,000 OPM
Standard 1/4 sheet,
hook and loop
103mm x 110mm
1.5kg
Power rating:
No load speed:
Sandpaper type:
Base size:
Net weight:
Sound pressure level:
81 dB(A)
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.
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Personal safety
Safety instructions
• 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.
WARNING. Read and understand 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 below refers to your
mains-operated (corded) power tool or battery-operated
(cordless) power tool.
• Use safety equipment. Always wear eye protection.
Safety equipment such as a dust mask, non-skid
safety shoes, hard hat, or hearing protection used for
appropriate conditions will reduce personal injuries.
• 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.
• Remove any adjusting key or wrench before turning
the tool on. A wrench or a key that is left attached to
a rotating part of the power tool may result in
personal injury.
Save these instructions
Work area
• Keep work area clean and well lit. Cluttered 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 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 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 jewellery.
Keep your hair, clothing and gloves away from moving
parts. Loose clothes, jewellery or long hair can be
caught in moving parts.
• If devices are provided for the connection of dust
extraction and collection facilities ensure that these
are connected and properly used. Use of these devices
can reduce dust-related hazards.
• 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
outdoor extension cord suitable for outdoor use. Use
of a cord suitable for outdoor use reduces the risk of
electric shock.
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.
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• 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 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 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 intended could result in a
hazardous situation.
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.
Service
• Have your power tool serviced by a qualified repair
personnel using only identical replacement parts.
This will ensure that the safety of the power tool
is maintained.
- Do not eat, drink or smoke in the work area.
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• 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
• Dust extraction canister
• Dust extraction adaptor
• Paper hole punch
• Instruction manual
Assembly
The GMC 1/4 Sheet Sander is packed, fully assembled
except for the dust extraction adapter.
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Know your product
1. Front handle
2. Rear handle
3. On/off switch
8
10
11
4. Sanding platen
5. Hook & loop base
6. Paper clamp
7. Dust extraction port
8. Dust extraction adapter
9. Dust extraction canister
10. Washable dust bag
11. Hole punch
3
2
1
9
7
6
4
5
7
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4.Move the sander over the
surface of the work in a
circular motion with an
even, moderate pressure.
CAUTION. Where possible,
clamp smaller workpieces
to the bench.
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.
NOTE. If there are still
scratches on your work after
sanding, try either of the
following:
1. Go back to a coarser grit and sand the marks out before
recommencing with the original grit.
2. Try using new sandpaper of the same grit to eliminate
the unwanted marks before progressing to a finer grit
and finishing the job.
Switching on and off
1.With the cordset fitted to
a power outlet, switch the
sander on by pressing the “I”
mark on the protective cover
of the on/off switch (3).
2.To turn off the sander,
press the “0” mark on the
protective cover of the on/
off switch (3).
Selecting the right grade of sandpaper
NOTE. It takes a few operations to get used to switching
the sander on and off due to the protective cover.
However, it is well worth the effort due to the protection
afforded to the switch and the consequent increased
lifetime of the unit.
Different grades of sanding paper
GRIT CHART
can be purchased from your local
GRIT
TYPE
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.
60 or less
Very
Coarse
80 – 100
120 – 150
180 – 220
Coarse
Medium
Fine
Using the sander
1.The sander can be used for most sanding operations
on materials such as wood, plastic, metal and painted
surfaces.
2.Wear safety goggles, dust mask and ear muffs.
3.Switch the sander on whilst
240 or more Very
Fine
it is resting on the workpiece. Take care to hold the
whole surface of the platen on the workpiece.
Fitting a sanding sheet
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.
1.Before fitting sandpaper, remove any dust or debris
from the hooks and loops of the base.
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2.When fitting Hook & Loop
sandpaper match the holes
in a suitable sheet with the
holes in the base.
3.Simply press the sheet to
the base to attach it.
4.To remove the sheet, peel
it away from the base.
CAUTION. Take care to
regularly clean out the build up of dust on the base
underneath the sandpaper and not to let the sandpaper
wear completely down before replacing it. Failure to
observe these two precautionary measures can lead to
damage to the hooks and loops on the platen and the
sandpaper will not attach properly.
Using the hole punch
1.If the sandpaper installed does not have holes it will be
necessary to punch holes into the sandpaper using the
hole punch (11) provided.
2.Place the hole punch on
a level surface.
3.After fitting the sandpaper
to the sander align the
base of the sander with
the hole punch and push
down on the sander until
the hole punch pierces the
sandpaper.
4.Remove the sander from
the hole punch.
5.Ordinary (non Hook & Loop type) sanding sheets
can also be used.
Dust extraction canister
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.
1.Attach the dust extraction
canister (9) to the sander
by pushing and twisting
the bayonet fitting in a
6.Release the paper clamp
(5) from both sides
of the sander.
7.Insert the end of the
sandpaper under one clamp
and pull the paper tight
over the base (4) ensuring
the holes align with those
in the base and then
clamp the other side.
similar action to inserting a light globe into a lamp.
8.The paper should be kept
tightly clamped over the
base, otherwise there could
be excessive wear of the
base material.
WARNING. Never use the
sander unless the entire base
is fitted with sandpaper or
another type of pad.
WARNING. For optimum dust extraction, remove and
empty the canister (10) when it is no more than half
full. Do not use the canister when sanding metal. The
hot metal particles could cause residual wood dust or the
internal bag itself to catch fire.
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2.Remove the cap from the
end of the canister (9)
to access the internal bag
(10) when you wish to
replace or clean the bag.
The bag can be washed.
Make sure the bag is
completely dry before
replacing it.
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.
Dust extraction adapter
The SA146 features a dust extraction port (7) and dust
extraction adapter (8) for easy connection to a dust
extraction unit.
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.
1. Connect the dust
extraction adapter to the
dust extraction port at the
back of the sander.
2. Attach a dust extraction
unit (not supplied) to the
dust extraction adapter.
This will help to efficiently
remove dust from the
workpiece and results in a
cleaner and safer working environment.
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.
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Carefully read the entire Instruction Manual
before using this product.
With continuing product development changes may
have occurred which render the product received
slightly different to that shown in this instruction
manual. The manufacturer reserves the right to
Before returning this product for a
Warranty Claim or any other reason
Please Call 1300 880 001 (Australia)
or 0800 445 721 (New Zealand)
change specifications without notice. Note:
Specifications may differ from country to country.
When you make your call, please have
the following information at hand:
• GMC Product Type • GMC Product Code
A GMC Service Engineer will take your call and, in
most cases, will be able to solve your problem over
the phone.
The GMC 777 Helpline operates from 7am to
7pm, 7 days a week (EST). This allows you
to contact GMC directly with any queries and
technical questions you have regarding
our products.
You are welcome to use this phone-in service to
make suggestions or give comments about any
GMC product.
45–55 South Centre Road
Melbourne Airport
Victoria, Australia 3045
Tel: (03) 8346 1100 Fax: (03) 8346 1200
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