Global Machinery Company Grinder BG612HPL User Manual

INSTRUCTION MANUAL  
150mm (6") 1/2HP / 200mm (8") 3/4HP  
Bench Grinders  
BG612HPL  
• Melbourne • Perth • Auckland • Hong Kong • Shanghai  
BG834HPL  
Taipei • New York • Verona • London • Paris  
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031222 ED7 DR  
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  
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.  
Specifications  
Nominal voltage: 230 – 240Vac ~ 50Hz  
BG612HPL  
1/2HP  
375W  
2850RPM  
150mm  
150mm  
25mm  
25mm  
36  
60  
BG834HPL  
3/4HP  
550W  
2850RPM  
200mm  
200mm  
25mm  
25mm  
36  
60  
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.  
HP  
Watts  
Spindle Speed  
Diameter Wheel 1  
Wheel 2  
Width  
Wheel 1  
Wheel 2  
Wheel 1  
Wheel 2  
Grit  
Bore Size Wheel 1  
Wheel 2  
Work Light  
12.7mm  
12.7mm  
Yes  
Yes  
16mm  
16mm  
Yes  
Yes  
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.  
Spindle Lock  
3
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Damage to hearing if effective earmuffs are not worn.  
Damage to eyes if eye protection is not worn  
Safety instructions  
The tool must be used only for the prescribed purpose.  
Any uses 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.  
Damage to lungs if breathing protection is not worn  
Always remove the plug from the mains socket before  
making any adjustments or maintenance, including  
changing the wheel.  
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.  
The manufacturer shall not be liable for any changes  
made to the tool nor for any damage resulting from  
such changes.  
Warning. Before connecting a tool to a power source  
(mains power point receptacle, outlet, etc.), be sure that  
the voltage supply is the same as that specified on the  
nameplate on 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.  
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.  
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 and high humidity. 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.  
4. Store tools safely. When not in use, tools should be  
stored in a dry, high place or locked up out of reach.  
5. Do not force the tool. The tool will do the job  
better and safer working at the rate for which it  
was designed.  
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.  
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 other  
than that for which it was intended.  
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:  
7. Dress correctly. Do not wear loose clothing or jewelry.  
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.  
Contact with the wheel.  
Kickback of work piece and parts of work piece.  
Wheel fracture.  
Catapulting of wheel pieces.  
4
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8. Use safety accessories. Safety glasses and earmuffs  
should always be worn. A face or dust mask is  
also required.  
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.  
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.  
19. Guard against electric shock. Prevent body contact  
with grounded objects such as water pipes, radiators,  
ranges and refrigerator enclosures.  
20. Use only approved parts. When servicing, use only  
identical replacement parts. Use an authorised service  
facility to fit replacement parts.  
11. Do not overreach. Keep your footing secure and  
balanced at all times.  
12. Look after your tools. Keep tools clean and sharp 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.  
Warning. The use of an accessory or attachment,  
other than those recommended in this Instruction  
Manual, may present a risk of personal injury.  
14. Remove adjusting keys and wrenches. Form the  
habit of checking to see that keys and adjusting  
wrenches are removed from the tool before switching  
it on.  
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.  
17. Stay alert. Watch what you are doing. Use common  
sense. Do not operate a power tool when you  
are tired.  
5
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When using the grinder, use safety equipment including  
safety goggles or shield, ear protection, dust mask and  
protective clothing including safety gloves.  
Additional safety rules for bench grinders  
Always remove the plug from the mains socket before  
making any adjustments or maintenance, including  
changing the wheel.  
Wear goggles  
Always wear eye protection and check that the eye  
shields on the grinder are properly adjusted.  
Always turn the grinder off when it is not in use and  
never leave it unattended without first switching off  
and removing the power plug. Never leave the grinder  
until the grinding wheels have come to a complete stop.  
Make sure that any replacement wheel is rated at  
3000RPM or higher.  
Do not let anyone under 18 years operate this tool.  
Wear ear protection  
Wear a breathing mask  
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.  
Rags, cloths, cord, string and the like should never be  
left around the work area.  
Connecting to the power supply  
The GMC Bench Grinders covered in this manual are  
designed to operate from a standard household supply of  
230-240V AC. Prior to plugging in the tool, check the  
rating label on the rear of the grinder and ensure that it  
states the tool’s operating voltage is 240V.  
All the grinders are of Class 1 Category (earthed) and are  
fitted with a 3-core cable and plug. Should the cable or  
plug be damaged, the product should be serviced by an  
authorised Service Centre to avoid a hazard.  
If you are interrupted when operating the tool,  
complete the process and switch off before looking up.  
Periodically check that all nuts, bolts and other fixings  
are properly tightened.  
Do not use a wheel that has received a blow, especially  
to the side of the wheel.  
Replace a cracked or suspect wheel.  
Always allow a new wheel to run for a few minutes at  
full speed before using it. Stand to one side at start up.  
Check that the wheel rotates freely each time before  
start up.  
Do not use the grinder unless all the guards are properly  
fitted and secure.  
Check that the tool rests are properly adjusted before  
commencing use.  
Do not overload the grinder. Allow the grinder to run at  
full speed, or close to full speed during use.  
Never apply excessive pressure to the wheel. It might  
shatter causing personal injury.  
Make sure that the wheel is not in contact with the  
work when you start the grinder.  
6
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1. MagniVision eye shield  
2. Eye shield  
3. Grinding wheel  
4. Outer guard  
5. Spindle lock button  
6. Rubber Mounts  
7. Base  
8. On/Off switch  
Know your product  
Before using the bench grinder, familiarise yourself with  
all the operating features and safety requirements.  
9. Light On/Off switch  
10. Adjustable tool rest  
11. Wheel guard  
12. Spark deflector  
13. Work light  
The GMC Bench Grinders are designed for light to  
moderate duty applications in a home environment. They  
are not intended for use by trade persons. They are ideal  
for sharpening tools such as drill bits and chisels. The  
larger tools can be applied to heavier grinding  
applications on steel sections.  
14. Tool storage drawer  
All the bench grinders can be fitted with a wire wheel  
provided that the wheel is rated for use at 3000RPM  
or higher.  
4
12  
2
9
5
13  
1
3
10  
11  
8
7
14  
6
7
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Caution. During use it is important not to overload the  
grinder. The grinder should run at close to full speed. If  
you are applying too much pressure the grinder will start  
to slow down. Under these conditions, remove the part  
being ground and allow the grinder to return to full  
speed. Re-apply the part to the grinder, but with a little  
less force.  
All of the grinders are supplied with grinding wheels  
designed for metal use only. The grinding of Copper, Brass,  
Aluminium, Wood or other similar materials will “clog” the  
grinding wheel.  
Fitting and adjusting the spark deflectors  
1. The spark deflectors (12) are already fitted to the  
bench grinder but will need to be adjusted prior to use,  
and then over time to compensate for wheel wear.  
2. To adjust the spark deflectors  
loosen the screw using the  
allen key supplied.  
Warning. Never attempt to grind Magnesium.  
Fitting and adjusting the eye shields  
Important. Prior to fitting the eye shields, ensure the  
grinder is turned off and the power plug is removed from  
the socket.  
Note. Always check to ensure the eye shields are correctly  
fitted each time the grinder is used. Eye shields must be  
fitted over each grinding wheel on all bench grinders in  
the range.  
3. Slide the spark deflector up or  
down so that the bottom edge  
is less than 6mm from the  
surface of the wheel, but not  
touching the wheel.  
1. The MagniVision eye shield (1) features a magnifying  
glass incorporated into the design to provide greater  
visibility and improved accuracy.  
4. Rotate the wheel by hand one  
full rotation to ensure the  
wheel can rotate without  
contacting the spark deflector.  
Firmly tighten the screw  
retaining the spark deflector.  
2. Take the MagniVision eye shield and fit it to the top of  
the right hand side light assembly. The other eye shield  
(2) should be installed on the left hand side.  
3. Fit a plastic coated screw  
through each side of the eye  
shield into the pivot points on  
the light assembly and  
tighten firmly to the point  
where the shield is secure, but  
still able to be adjusted up  
and down.  
Fitting the tool rests  
The tool rests (10) are required for each high speed  
grinding wheel to assist in the grinding operation.  
Caution. Never use a Bench Grinder on which the tool rest  
has not been fitted or where the tool rest has not been  
correctly adjusted.  
The right hand side tool rest features an indentation that  
helps you rest your work piece for more accurate grinding.  
The securing screws are plastic  
coated so they can be adjusted at any time without the  
use of tools.  
8
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Note. The tool rests are right and left handed. Follow the  
diagrams to ensure the correct tool rest is fitted to the  
correct side.  
Bench mounting the grinder  
The GMC Bench Grinders are supplied with 4 rubber mounts  
(6) which assist in reducing the transmission of vibration.  
Important. Prior to fitting the tool rests, ensure the  
grinder is turned off and the power plug is removed from  
the socket.  
1. Remove the lower screw on  
the wheel guard (11).  
It is strongly recommended that the grinder be firmly  
mounted to a bench or stand for safe operation.  
The base of the grinder has a 12mm hole in each corner.  
These holes accept bolts up to 10mm in diameter.  
Mounting bolts are not supplied with the unit.  
Where the grinder is to be mounted to a steel work bench,  
it is advisable to place a piece of timber between the  
bench and grinder then bolt through the grinder and  
timber into the bench. This further assists to reduce  
vibration.  
Important. When directly mounting the grinder ensure:  
The surface under the grinder is flat and clean.  
The 4 mount bolts are applied evenly and not over  
tightened.  
Note. The four rubber mounts should remain in place if  
mounting bolts are used.  
2. Hold the tool rest (10) in the  
correct position against the  
inner surface of the wheel  
guard. Fit the screw through  
both sides of the guard and  
then through the tool rest.  
Using the On/Off switch  
1. To turn the grinder on, press the right hand side of the  
On/Off switch (8) to the position marked "ON"  
2. To turn the grinder off, press the left hand side of the  
On/Off switch (8) to the position marked "OFF".  
3. Fit the star washer first,  
followed by the flat washer  
and then the plastic coated  
nut to the screw and tighten  
the nut sufficiently to support  
the tool rest but still allowing  
the tool rest to slide inwards  
and outwards.  
Using the work light  
1. The work light (13) can be used to illuminate the work  
area and provide greater visibility.  
2. To turn the work light on press the light On/Off switch  
(9) to the position marked " ON".  
4. Slide the tool rest to within a  
maximum of 1.5mm from the wheel. Rotate the wheel  
one full revolution by hand to ensure the wheel does  
not contact the tool rest.  
3. To turn the work light off press the light On/Off switch  
(9) to the position marked " OFF".  
5. Tighten the thumb nut firmly to retain the assembly.  
Repeat the assembly operation for the second tool rest.  
9
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4. Depress and hold the spindle  
lock button and turn the wheel  
by hand until it locks in place.  
Remove the retaining nut (see  
note below for correct direction  
of rotation), outer flange and  
the wheel.  
Operation  
Important. Prior to using the grinder, check that the eye  
shields, spark deflectors, and tool rests are fitted and  
correctly adjusted and that you are wearing safety gear  
including eye, hearing and breathing protection.  
1. Turn the wheel by hand to make sure it does not touch  
the guard, eye shields, spark deflectors or tool rests and  
runs freely.  
2. Stand to one side, turn the switch (8) on and allow the  
motor to reach full speed.  
3. Support the work piece on the tool rest (10) and  
gradually feed the work piece onto the wheel. Use pliers  
to hold small work pieces.  
Note. Traverse the work piece across the full width of the  
wheel to prolong its flat surface.  
4. If the grinding operation causes the motor speed to  
noticeably decrease, pull back the work piece, allow the  
motor to regain full speed and restart the grinding  
operation, but apply less force.  
Note. The wheel on the left-hand  
side of the grinder has a left-  
hand thread and is unscrewed in a clockwise direction. The  
wheel on the right-hand side of the grinder has a right-  
hand thread and is unscrewed in  
an anti-clockwise direction.  
5. Fit the replacement wheel on  
the shaft ensuring that there  
is a blotter between the wheel  
and clamp washers on each  
side of the wheel, and ensure  
the wheel is a slide fit (not  
loose) on the spindle.  
6. Replace the outer flange and retaining nut (see the  
Note above regarding the direction of rotation of the  
nut).  
7. Depress and hold the spindle lock button and tighten  
the nut. Do not over tighten.  
Warnings. Only use the front face of the grinding wheel,  
not the sides. Note that the work piece can get very warm.  
It may be necessary to cool a work piece by dipping it in a  
coolant or in water. Do not apply coolant or water to the  
grinding wheel.  
8. Replace the outer guard.  
9. Replace the retaining screw, spark deflector and tool  
rest.  
10. Re-adjust the tool rest and spark deflector.  
11. Rotate the wheel by hand to check for free movement  
and proper adjustments.  
12. Plug in the grinder, put on eye protection, stand to  
one side and run the grinder at full speed for several  
minutes.  
Changing a grinding wheel  
Important. Prior to changing a wheel, ensure the grinder  
is turned off and the power plug is removed from the  
socket. Make sure that the replacement wheel is rated at  
3000RPM or higher.  
1. Remove the retaining screw and  
take off the tool rest (10).  
2. Remove the retaining screw  
and take off the spark  
deflector (12).  
3. Take off the third retaining  
screw and remove the outer  
guard (4).  
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4. Adjust the tool rest so that it is no more than 1-1.5mm  
from the wheel.  
5. Adjust the spark deflector to ensure the gap between  
the bracket and wheels is less than 6mm.  
Fitting a wire wheel  
Your bench grinder is capable of fitting a wire wheel  
instead of a grinding wheel.  
When fitting a wire wheel ensure the wire wheel is the  
correct size for the grinder and also ensure the bore size of  
the wheel is correct for the spindle of the grinder.  
Refer to the specification section of this manual for  
grinding wheel and bore sizes.  
Grinder adjustments  
During the life of the grinder some adjustments are  
required to maintain a safe working environment. Please  
ensure the following:  
When fitting the wire wheel, follow the details as  
described in the section ‘Changing a grinding wheel’ on  
how to remove the grinding wheel. Ensure to leave the  
inner flange on the spindle of the grinder. Supplied with  
the grinder are 2 small rubber washers. Fit one rubber  
washer on to the spindle and push all the way until it  
makes contact with the inner flange. Slide the wire wheel  
onto the spindle, ensuring the wheel is a slide fit onto the  
shaft, all the way to the rear flange. Then fit the second  
rubber washer onto the spindle and push it against the  
wire wheel. Fit the outer flange and securing nut and  
tighten the nut as described in the section ‘Changing a  
grinding wheel. Assemble the grinder and test as per the  
details in ‘Changing a grinding wheel.  
Always adjust the eye shields to the most  
comfortable and most effective angle to suit the task  
being performed.  
As the wheels wear, the spark deflector must be adjusted  
to ensure the gap between the spark deflector and the  
wheel does not exceed 6mm.  
As the wheels wear the tool rests must also be adjusted  
so there is never a gap greater than 1.5mm between the  
wheel and the edge of the tool rest.  
Maintenance  
Prior to any maintenance ensure the power has been  
turned off and the plug is removed so that the grinder is  
fully disconnected from the 240V supply.  
Warning. Ensure to wear safety glasses.  
Lubrication  
How to true and dress the wheels  
1. All models use pre-lubricated sealed ball bearings for  
the motor and do not require lubrication.  
Dressing a wheel cleans and levels the front surface to  
increase efficiency of operation and prevent vibration.  
2. If the wheels do not rotate freely, the bearings should  
be replaced by an authorised service centre.  
1. Dressing a wheel involves the use of a wheel dresser  
which is not supplied with the grinder. Follow the  
manufacturers instructions of the wheel dresser.  
2. Adjust the tool rest to allow the front part of the wheel  
dresser to fit between the tool rest and wheel.  
3. Start the motor and move the dresser across the front  
of the wheel a sufficient number of times until the  
surface is level. It is not necessary to apply excessive  
force in an attempt to dress the wheel in one pass of  
the wheel dresser.  
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Cleaning  
1. Keep the outside of the grinder clean by brushing grinding  
dust and dirt away from all areas where the dust tends to  
build up. Wear eye protection when brushing.  
2. Wipe the guards and grinder with a soft damp cloth. A  
mild detergent can also be used.  
3. Wipe the eye shields with a soft damp cloth, making  
sure not to scratch the surface. A mild detergent can also  
be used.  
Caution. Never use caustic agents, petrol based cleaners,  
alcohol or any other cleaning agents. Do not wet down  
the grinder.  
General inspection  
1. Regularly check that all the fixing screws are tight. They  
may vibrate loose over time.  
Repairs  
1. 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.  
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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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