INSTRUCTION MANUAL
355mm (14”)
Cut Off Saw
• Melbourne • Perth • Auckland • Hong Kong • Shanghai
COS355
040927 ED7 PR
• Taipei • New York • Verona • London • Paris
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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
Conforms to relevant standards for
electromagnetic compatibility.
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.
Double insulated for additional protection.
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:
230–240Vac ~ 50Hz
2200W
3750min-1
355mm
120mm
25.4mm
100mm*
90mm square*
60 x 200mm*
130mm*
Input power:
No load speed:
Disc diameter:
Flange diameter:
Disc bore size:
Pipe:
Box Section:
Rectangular Steel Tubing:
Angle Iron:
Solid Steel Bar:
Insulation:
* Cutting capacities are based on using a full size 355mm
cutting disc that is not worn. As the disc wears the
cutting capacity will reduce.
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.
35mm*
Double insulated
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7.Dress correctly. Do not wear loose clothing or jewellery.
They can be caught in moving parts. Rubber gloves
and non-slip footwear are recommended when working
outdoors. If you have long hair, wear a protective hair
covering.
8.Use safety accessories. Safety glasses and earmuffs
should always be worn. A face or dust mask is also
required if the sanding operation creates dust.
9.Do not abuse the power cord. Never pull the cord to
disconnect the tool from the power point. Keep the cord
away from heat, oil and sharp edges.
10.Secure the work piece. Use clamps or a vice to hold
the work piece. It is safer than using your hand and
frees both hands to operate the tool.
General safety instructions
To use this tool properly, you must observe the safety
regulations, the assembly instructions and the operating
instructions to be found in this Manual. All persons who
use and service the machine have to be acquainted with
this Manual and must be informed about its potential
hazards. Children and infirm people must not use this
tool. Children should be supervised at all times if they
are in the area in which the tool is being used. It is
also imperative that you observe the accident prevention
regulations in force in your area. The same applies for
general rules of occupational health and safety.
Warning. When using power tools, basic safety
precautions should always be taken to reduce the risk of
fire, electric shock and personal injury. Also, please read
and heed the advice given in the additional important
safety instructions.
11.Do not overreach. Keep your footing secure and
balanced at all times.
12.Look after your tools. Keep tools sharp and clean for
better and safer performance. Follow the instructions
regarding lubrication and accessory changes. Inspect
tool cords periodically and, if damaged, have them
repaired by an authorised service facility. Inspect
extension cords periodically and replace them if
damaged. Keep tool handles dry, clean and free from
oil and grease.
13.Disconnect idle tools. Switch off the power and
disconnect the plug from the power point before
servicing, when changing accessories and when the
tool is not in use.
1.Keep the work area clean and tidy. Cluttered work
areas and benches invite accidents and injury.
2.Consider the environment in which you are working.
Do not use power tools in damp or wet locations.
Keep the work area well lit. Do not expose power tools
to rain. Do not use power tools in the presence of
flammable liquids or gases.
3.Keep visitors away from the work area. All visitors
and onlookers, especially children and infirm persons,
should be kept well away from where you are working.
Do not let others in the vicinity make contact with the
tool or extension cord.
14.Remove adjusting keys and wrenches. Check to see
that keys and adjusting wrenches are removed from
the tool before switching on.
4.Store tools safely. When not in use, tools should be
locked up out of reach.
5.Do not force the tool. The tool will do the job better
15.Avoid unintentional starting. Always check that the
switch is in the OFF position before plugging in the
tool to the power supply. Do not carry a plugged in
tool with your finger on the switch.
16.Use outdoor rated extension cords. When a tool
is used outdoors, use only extension cords that are
intended for outdoor use and are so marked.
and safer working at the rate for which it was designed.
6.Use the correct tool for the job. Do not force small
tools or attachments to do the job best handled by a
heavier duty tool. Never use a tool for a purpose for
which it was not intended.
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17. Stay alert. Watch what you are doing. Use common
Additional safety rules for cut off saws
WARNINGS.
sense. Do not operate a power tool when you are tired.
18.Check for damaged parts. Before using a tool,
check that there are no damaged parts. If a part is
slightly damaged, carefully determine if it will operate
properly and perform its intended function. Check for
alignment of moving parts, binding of moving parts,
breakage of parts, proper mounting and any other
conditions that may affect the operation of the tool.
A part that is damaged should be properly repaired
or replaced by an authorised service facility, unless
otherwise indicated in this Instruction Manual.
Defective switches must be replaced by an authorised
service facility. Do not use a tool if the switch does
not turn the tool on and off correctly.
Always wear eye protection.
Do not use cutting wheels, the maximum permissible
speed of which is below the RPM value stated on the tool.
• Check the cut off disc before mounting it into the saw.
Strike the disc with a wooden handle whilst balancing
the disc on your finger. Listen for the ring. If the tone
is dull, do not use the disc. It may be cracked.
• When the disc is installed, stand to one side, out of line
with the disc, and run the tool for at least a minute to
make sure that it is not faulty. Always stay out of line
of the disc when using the saw.
• Do not use a cut off disc marked with a lower RPM than
that of the no load speed shown on the rating plate of
the tool.
• Check that the mains voltage matches that given on the
rating plate before plugging in the tool.
19.Guard against electric shock. Prevent body contact
with grounded objects such as water pipes, radiators,
cookers and refrigerator enclosures.
20.Use only approved parts. When servicing, use only
identical replacement parts. Use an authorised service
facility to fit replacement parts.
• Ensure that the work piece is held tight in the vice.
• When cutting through long material, ensure that it is
supported properly by packing up each end to match
the height of the vice.
• Use only good quality cut off discs as poor quality discs
tend to glaze up which can cause unnecessary load on
the motor and resulting damage.
• Let the disc do the cutting at a reasonable feed. If too
much pressure is applied the motor will be overloaded
causing the disc to slow resulting in inefficient cutting
and possible damage to the motor.
• When operating the cut off saw, use safety equipment
including safety goggles or shield, ear protection, dust
mask and protective clothing including safety gloves.
WARNING. Before connecting a tool to a power source
(mains switch power point receptacle, outlet, etc.) be sure
that the voltage supply is the same as that specified on
the nameplate of the tool. A power source with a voltage
greater than that specified for the tool can result in
serious injury to the user, as well as damage to the tool.
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If in doubt, do not plug in the tool. Using a power source
with a voltage less than the nameplate rating is harmful
to the motor.
Accessories
The GMC COS355 chop saw is supplied with the following
accessories as standard
The tool must be used only for its prescribed purpose.
Any use other than those mentioned in this Manual will
be considered a case of misuse. The user and not the
manufacturer shall be liable for any damage or injury
resulting from such cases of misuse. The manufacturer
shall not be liable for any changes made to the tool nor
for any damage resulting from such changes.
Even when the tool is used as prescribed it is not possible
to eliminate all residual risk factors. The following hazards
may arise in connection with the tool’s construction
and design:
1. 8mm Hex key
2. 5mm Hex key
3. 355mm Cut off disc (fitted)
4. Rear spark shield
5. Rubber feet (x4)
6. Instruction manual
7. Receipt holder
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.
• Contact with the disc.
• Kickback of work piece and parts of work piece.
• Disc fracture.
• Catapulting of disc pieces.
• Damage to hearing if effective earmuffs are not worn.
1.Remove all loose parts from the carton.
2.Remove the packing materials from around the saw.
• Harmful emissions of grinding dust when the machine
is used in closed rooms.
3.Carefully lift the saw from the carton and place it on a
level work surface.
4.The saw has been shipped with the saw arm locked in
the down position. To release the saw arm, push down
on the top of the saw arm and rotate the lock down
knob in a clockwise direction.
• Do not use discs that are deformed or cracked.
• Always remove the plug from the mains socket before
making any adjustments or maintenance, including
changing the disc.
Assembly
The GMC chop saw is packed, fully assembled except for
the rear spark shield and rubber feet.
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Know your product
1.Trigger switch
2.Lock-off button
3.Disc guard
1
18
4.Front spark shield
5.Spark shield locking knob
6.Cut off disc
7.Spindle lock
8.Rear spark shield
9.Base
19
2
3
4
16
15
10. Rubber foot
11. Vice lock release lever
12. Vice handle
13. Vice
5
6
14. Fence
15. Carry handle
16. Lock down knob
17. Depth stop
18. 8mm Hex key
19. 5mm Hex key
7
17
8
9
14
13
11
16
12
10
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Overview
Adjusting the vice
The vice can be adjusted quickly by loosening the vice lock
release lever and pushing forward.
1.Place your workpiece in
between the fence and vice.
2.Lift the vice lock release lever
and push the vice forward.
The cut off saw is used for cutting steel such as pipe,
box section, rectangular, angle iron and steel bars.
The saw can cut at angles from 0° to 45° left and
right, it features a two position fence that permits an
extended cutting range. The quick release vice allows fast
adjustment whilst the lock-off button prevents accidental
operation.
3.Once the vice hits the
workpiece move the vice lock
release lever back down.
Attaching the rubber feet
1. Tilt the saw onto its side.
2. Take the rubber feet and
insert 1 rubber foot into the
matching slots on the base
of the saw.
3. Ensure the rubber feet are
fully inserted into the slots.
4.Rotate the vice handle in a
clockwise direction to secure
the workpiece in position.
5. To remove an object from
the vice, rotate the vice
handle in an anti-clockwise
direction until the vice jaws
are loose. The work piece
4. Repeat for the other side
and place the chop saw back on its base.
can now be removed, the
vice lock release lever can
Attaching the rear spark shield
also be lifted to slide the vice back quickly.
Note. The vice lock release lever cannot be lifted until the
vice jaws are loose.
1.Loosen and remove the hex bolt, flat washer and star
washer at the back of the saw using the 5mm hex key
supplied.
Adjusting the cutting angle
1.To change the cutting angle loosen the 2 hex screws
securing the fence using the 8mm hex key supplied.
2.Move the rear fence to the desired angle using the scale
as a guide.
2.Place the flat washer over the hex bolt and then fit
the hex bolt through the spark deflector, place the star
washer over the hex bolt so it is in between the spark
deflector and the cut off saw. Place the spark shield in
the correct position and tighten the hex bolt.
3.Tighten the hex bolt to secure the spark shield in position.
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3.Tighten the 2 hex bolts to secure the fence in position.
CAUTION. Only perform miter cuts when the fence is set
at the most forward position.
Note. For accurate cuts, test the cutting angle on some
similar scrap material and adjust the angle to suit your
requirements. The scale is only a guide.
4.When you release the trigger switch, the machine
turns off and the lock-off button re-engages to prevent
accidental operation.
Warning. The cutting disc will continue to run down for a
short period of time after the trigger swich has been released.
Replacing a cut off disc
Adjusting the fence
1.The original spacing between the vice and the fence is
175mm.
2.When cutting wider materials the rear fence will need
to be adjusted to the rear most position. When cutting
narrow work pieces the fence should be positioned in
the most forward position.
CAUTION. Always ensure that the saw is switched off
and unplugged from the power supply before installing or
removing a disc.
1.Loosen and remove the spark shield locking knob.
2.Swing the front spark shield downwards and pull out
from the upper disc guard to reveal the cutting disc bolt
and flange.
3.To adjust the fence loosen and remove the two hex bolts
securing the fence using the 8mm hex key supplied.
4.Move the fence backwards or forwards to one of the
other two fixing positions.
5. Tighten the 2 hex bolts to secure the fence in position.
3.Push the spindle lock lever to the right and rotate the
disc until the spindle lock engages.
4.Whilst holding the spindle lock lever use the 8mm hex
key supplied to remove the disc bolt. Note that the bolt
unscrews in an anti-clockwise direction.
5.Remove the disc lock bolt, washer, outer flange, blotter
and cut off disc.
CAUTION. Narrow work pieces may not be secured safely
when using the two wider interval settings.
Turning on and off
1.Plug the cordset into the
mains socket.
2.Push the lock-off button and
pull the trigger to start the tool.
3.To stop the tool release the
trigger switch
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6.Clean any grinding dust from
the inner flange and, after
checking that it is in good
condition, mount a new disc
between two paper blotters.
The rear blotter should be
mounted onto the inner
flange and the front blotter
is the printed surface on the
front of the disc.
7.Replace the outer flange, washer and lock bolt. Tighten
the bolt in a clockwise direction.
8.Turn the new disc by hand, ensuring that it rotates fully
and does not wobble unduly.
FULLY upright position, there is only one threaded hole
exposed. Replace the spark shield locking screw fully in this
hole. Operate the spark guard up and down to ensure it is
correctly located prior to turning the cut off saw on.
Note. Ensure that the depth
stop is adjusted to the correct
height before commencing
operation. The adjustable depth
stop is threaded into the base
of the machine at the rear. By
raising and lowering the depth
stop bolt with the 5mm hex
key the travel of the cut off
wheel can be controlled. This feature is particularly useful
to prevent contact with the work bench surface when a
new disc is fitted or increase disc travel as the abrasive
disc wears. The depth stop should be checked and adjusted
everytime a new disc is fitted.
9. Replace the front spark shield by locating the centre
pivot section of the spark shield into the raised centre
section of the upper disc guard.
Note. You need to locate the
small tab of the spark guard on
the inside of the wheel guard.
You may need to push this into
position over the head of the
disc locking bolt. The two parts
will only locate together when
the spark guard is in the down
position with approximately
Operation
1.Make all adjustments including
setting the vice, fence position
and fence angle.
2.Ensure that the work piece is
fully secured before starting
any cutting.
Note. Ensure you are wearing
the appropriate safety gear
including eye protection and hearing protection.
3.Check that the disc, guard and tool are in good condition.
4.Plug the cordset into the mains socket.
5.Push the lock-off button and pull the trigger to start the
tool.
6.Bring the disc down onto the workpiece and allow it to
cut its way through the workpiece without undue force.
7.Once the cut is finished, raise the arm to clear the disc
from the work piece, release the trigger and the cut off
saw will stop. Please note that the disc will continue to
80mm of the wheel at the bottom exposed. After locating
centrally, lift the spark guard FULLY, ensuring the two parts
rotate correctly and do not detach. With the guard in the
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turn for a few revolutions even though the saw is switched
off. Keep your hands well away from the moving disc.
long length cut for the next section. The longer the
length of cut, the more chance of the cutting disc
glazing and motor overload.
Note. As the disc wears the cutting capacity will decrease
and the depth stop knob may need to be adjusted.
Some helpful tips when using the chop saw
• Disc selection. The cutting disc must match the material
to be cut. There are a wide variety of cutting discs
and careful selection will assist in the correct and safe
operation of the saw. For example, select a masonry
cutting disc for bricks and tiles, a bar cutting disc for
cutting solid metal section and a metal stud cutting disc
for cutting steel sections. General purpose metal cutting
discs are also available but where possible it is better to
use the correct cutting disc for the task being performed.
Maintenance
WARNING. Always ensure that the tool is switched off and
the plug is removed from the power point before making
and adjustments or maintenance procedures.
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.
• Abrasive cutting discs wear. The cutting discs wear so as
to constantly expose to the material being cut clean and
sharp cutting edges. This is normal for this type of cutter.
Cleaning
• During the cutting operation apply a constant and even
pressure to the cutting arm. The disc should be constantly
cutting, and sufficient pressure needs to be applied to keep
the cutting action going. If insufficient pressure is applied,
the wheel has a tendency to clog, and the cutting edges
of the disc become blunt and the cutting process reduces
considerably. This is called glazing of the wheel and is due
to the incorrect cutting disc for the material being cut, or
the cutting rate being too slow.
• Do not overload the saw. The saw should run during
the cutting operation at close to full speed. Too much
pressure being applied to the tool will slow the motor
and can cause motor failure.
1.Keep the tool’s air vents unclogged and clean at all times.
2.Remove dust and dirt regularly. Cleaning is best done
with a soft brush or a rag.
3.Re-lubricate all moving parts at regular intervals.
4.Never use caustic agents to clean plastic parts.
5. Remove the metal that may have built up around the
guard and spark deflector.
CAUTION. Do not use cleaning agents to clean the plastic
parts of the saw. A mild detergent on a damp cloth is
recommended.
General inspection
• Too much pressure being applied to the tool can also
cause the cutting disc to cut on an angle. Ensure the
beginning of the cut is a gradual start and apply the
firm and constant pressure as the cut gets deeper.
Regularly check that all the fixing screws are tight. They
may vibrate loose over time.
• When cutting sections, always try and cut the sections
so as the actual cutting length is as short as possible
through the section. For example, angle iron has two
sections to be cut. If the material is cut where both
sections are cut at once, it is better for the cutting
action than trying to cut on thin section and then a
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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
Save this Manual for future reference.
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