Northern Industrial Tools Grinder 143388 User Manual

8"  
BENCH GRINDER  
OWNER'S MANUAL  
WARNING:  
Read carefully and understand all INSTRUCTIONS before  
operating. Failure to follow the safety rules and other basic  
safety precautions may result in serious personal injury.  
Item # 143388  
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Keep children and bystanders away while operating a power tool. Distractions can  
cause you to lose control, so visitors should remain at a safe distance from the work area.  
Be aware of all power lines, electrical circuits, water pipes and other mechanical haz-  
ards in your work area, particularly those hazards below the work surface hidden from the  
operator's view that may be unintentionally contacted and may cause personal harm or  
property damage.  
Be alert of your surroundings. Using power tools in confined work areas may put you  
dangerously close to cutting tools and rotating parts.  
ELECTRICAL SAFETY  
WARNING! Always check to ensure the power supply corresponds to the voltage on the  
rating plate.  
Do not abuse the cord. Never carry a portable tool by its power cord, or yank tool or  
extension cords from the receptacle. Keep power and extension cords away from heat, oil,  
sharp edges or moving parts. Replace damaged cords immediately. Damaged cords may  
cause a fire and increase the risk of electric shock.  
Grounded tools must be plugged into an outlet properly installed and grounded in accor-  
dance with all codes and ordinances. Never remove the grounding prong or modify the  
plug in any way. Do not use any adapter plugs. Check with a qualified electrician if you are  
in doubt as to whether the outlet is properly grounded.  
Double insulated tools are equipped with a polarized plug (one blade is wider than the  
other). This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the  
outlet, reverse the plug. If it still doesn't fit, contact a qualified electrician to install a polar-  
ized outlet. Do not change the plug in any way.  
Avoid body contact with grounded surfaces such as pipes, radiators, ranges, and refrig-  
erators. There is an increase risk of electric shock if your body is grounded.  
When operating a power tool outside, use an outdoor extension cord marked “W-A” or  
“W.” These cords are rated for outdoor use and reduce the risk of electric shock.  
Extension Cord Use:  
A. Use only 'Listed' extension cords. If used outdoors, they must be marked “For  
Outdoor Use.” Those cords having 3-prong grounding type plugs and mating recepta-  
cles are to be used with grounded tools.  
B. Replace damaged or worn cords immediately.  
C. Check the name plate rating of your tool. Use of improper size or gauge of extension  
cord may cause unsafe or inefficient operation of your tool. Be sure your extension  
cord is rated to allow sufficient current flow to the motor. For the proper wire gauge  
for your tool, see chart.  
CHART FOR MINIMUM WIRE SIZE OF EXTENSION CORD:  
If in doubt, use larger cord. Be sure to check voltage requirements of the tool to your  
incoming power source.  
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Do not expose power tools to rain or wet conditions. Water entering a power tool will  
increase the risk of electric shock.  
Do not let your fingers touch the terminals of plug when installing to or removing from  
the outlet.  
Ground fault circuit interrupters. If work area is not equipped with a permanently  
installed Ground Fault Circuit Interrupter outlet (GFCI), use a plug-in GFCI between power  
tool or extension cord and power receptacle.  
PERSONAL SAFETY  
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.  
Dress properly. Do not wear loose clothing, dangling objects, or jewelry. Keep your hair,  
clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be  
caught in moving parts. Air vents often cover moving parts and should be avoided.  
Use safety apparel and equipment. Use safety goggles or safety glasses with side  
shields which comply with current national standards, or when needed, a face shield. Use  
as dust mask in dusty work conditions. This applies to all persons in the work area. Also  
use non-skid safety shoes, hardhat, gloves, dust collection systems, and hearing  
protection when appropriate.  
Avoid accidental starting. Ensure the switch is in the off position before plugging tool into  
power outlet. In the event of a power failure, while a tool is being used, turn the switch off  
to prevent surprise starting when power is restored.  
Do not overreach. Keep proper footing and balance at all times.  
Remove adjusting keys or wrenches before connecting to the power supply or turning  
on the tool. A wrench or key that is left attached to a rotating part of the tool may result in  
personal injury.  
TOOL USE AND CARE  
Do not force the tool. Tools do a better and safer job when used in the manner for which  
they are designed. Plan your work, and use the correct tool for the job.  
Never use a tool with a malfunctioning switch. Any power tool that cannot be controlled  
with the switch is dangerous and must be repaired by an authorized service representative  
before using.  
Disconnect power from tool and place the switch in the locked or off position before  
servicing, adjusting, installing accessories or attachments, or storing. Such preventive  
safety measures reduce the risk of starting the power tool accidentally.  
Secure work with clamps or a vise instead of your hand to hold work when practical. This  
safety precaution allows for proper tool operation using both hands.  
Store idle tools. When tools are not is use, store them in a dry, secure place out of the  
reach of children. Inspect tools for good working condition prior to storage and before re-use.  
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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.  
Keep guards in place and in working order.  
Never leave tool running unattended.  
UNPACKING  
When unpacking the Bench Grinder, please check if any parts are missing or broken, please  
call Northern Tool + Equipment. Carefully remove the grinder and related hardware from the  
carton and examine it thoroughly to insure it has not been damaged. This carton should  
contain the following items:  
Description  
Qty  
Bench Grinder . . . . . . . . . . . . . . . .1  
Eye Shields . . . . . . . . . . . . . . . . . .2  
Tool Restst . . . . . . . . . . . . . . . . . . .2  
Spark Guards . . . . . . . . . . . . . . . . .2  
Manual . . . . . . . . . . . . . . . . . . . . . .1  
Short bolts . . . . . . . . . . . . . . . . . . .4  
Bolts . . . . . . . . . . . . . . . . . . . . . . . .2  
Long bolts . . . . . . . . . . . . . . . . . . .2  
Mounting Rods . . . . . . . . . . . . . . . .2  
Washers . . . . . . . . . . . . . . . . . . . . .2  
Brackets . . . . . . . . . . . . . . . . . . . . .2  
Large Washers . . . . . . . . . . . . . . . .6  
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ASSEMBLY  
SWITCH  
The switch is located on the front of the grinder near the bottom. To turn the tool ON depress  
the rocker switch at the top near the word ON. To turn the tool OFF depress the bottom por-  
tion of the rocker switch near the word OFF.  
INSTALLING TOOL RESTS  
Turn off and unplug the bench grinder.  
Remove the tool rests from the top portion of the poly-foam  
carton liner and install them to the wheel guards as shown  
in the figure. Use the bolts and washers from the plastic bag  
to secure them in place as shown in Figure 1.  
Short  
bolts  
NOTE: There is a left and a right tool rest. Refer to Figure 1  
to ensure that you install them correctly. When in actual use,  
the tool rests should be adjusted to within 1/4" of the grind-  
ing wheel or other accessory being used.  
Washers  
INSTALLING THE SPARK GUARDS AND EYE SHIELD  
BRACKETS  
Right  
tool rest  
Turn off and unplug the bench grinder.  
Fig. 1  
Fig. 2  
The spark guards are packed in the plastic bag shipped with  
your grinder. Select from the bag, the two spark guards and  
the two smaller bolts and washers. Install the spark guards  
to the wheel guards of your grinder as shown in Figure 2.  
Adjust them to within 1/16" of the grinding wheel or other  
accessory being used.  
Right  
spark  
guard  
Bolt  
NOTE: There is a left and right spark guard. Refer to  
Figure 2 to ensure, that you install them correctly.  
Washer  
INSTALLING THE EYE SHIELDS  
Turn off and unplug the bench grinder.  
Remove all remaining parts from the plastic bag.  
Bracket  
Flat  
washer  
Long  
bolt  
Right  
mounting  
rod  
Fig. 3  
NOTE: There is a left and a right eye shield mounting rod.  
Examine the figure closely to ensure that you are installing  
them correctly.  
The one pictured in Figure 3 is for the right wheel guard as  
you face the front of the tool.  
Eye shield mounting  
rod assembly  
Fig. 4  
Carefully examine Figure 3 and assemble one rod, one  
bracket, one bolt and one flat washer as shown. When it  
has been assembled as shown in the figure, install it to the  
wheel guard of the grinder.  
Position it with the arm high, as shown in Figure 4. and  
tighten the bolt securely.  
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NOTE: The eye shields are identical and will fit properly on  
either side of the grinder. However it may be necessary to  
loosen the center hex nut in order to slip the shield over the  
mounting rod.  
After you have assembled and installed each-eye shield  
mounting rod to the grinder attach the eye shields to the  
rods as shown in Figure 5.  
Fig. 5  
Back of  
eye shield  
Right  
mounting  
rod  
Hex nut  
Install them in such a way that the three hex nuts on each  
eye shield are on the back side away from the operator  
when the tool is in use.  
Tighten the centra hex nut so that the shield can be moved but will be tight enough to stay  
in place.  
Always position the eye shields between your eyes and the grinding wheel or other accessory  
being used.  
OPERATION  
Note: The bench grinder needs to be bolted to the work surface before you start to use the  
tool. Use ø 2/5” (10mm) bolts or screws to fix the bench grinder on your work surface.  
General operation  
Step 1: Obtain a tray that is large enough for the workpiece to fit into, fill it with water and  
place it near the Bench Grinder.  
Step 2: Turn the Bench Grinder on.  
Step 3: Once the GRINDING WHEEL has reached full speed, bring the workpiece up to the  
wheel gently and without jarring.  
Step 4: Use the TOOL REST to steady the workpiece.  
Step 5: The workpiece will quickly become heated. Frequently quench the workpiece in  
water. If the metal becomes heated so much that it gets blue-colored, it will be too  
soft to be useful. You must grind off the part that is colored, cool the workpiece and  
start again.  
SWITCH  
WARNING! Be safe! Protect your eyes and wear safety goggles at all times while  
operating grinder.  
The switch is located on the front of the base of this grinder. Move ON/OFF switch to the ON  
position to activate.  
NOTE: ALWAYS turn grinder OFF via the switch in the event of a disruption in the electrical  
power supply. This will safeguard operator against possible injury when power is restored.  
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EYESHIELDS  
WARNING! Never operate grinder with eyeshields removed.  
Position the eyeshields so that manipulation of the work piece to the grinding stone is not  
obstructed by the shield and that the piece of work is between the stone and the eyeshield.  
SPARK DEFLECTORS  
Adjust periodically to insure that the distance between O.D. of the stone/wire wheel and  
the bottom edge of the spark deflector is 1/16" clearance.  
Insure screws are securely tightened.  
TOOL RESTS  
Keep tool rests adjusted to 1/16" clearance between O.D. of stone/wire wheel and the  
inside edge of tool rests.  
Adjust the tool rests to insure the work piece to be ground will contact the wheel slightly  
above centre line of the shaft.  
Periodically check adjustment to insure proper clearance is maintained.  
GRINDING STONE  
To replace grinding wheel remove outer guard by removing 3 screws (Fig 5 A)  
Remove hex nut (Fig. 5B) using appropriate wrench.  
Remove and replace stone with a proper size stone of choice insuring that the speed rat-  
ing of the stone is equal to or greater than the machine nameplate.  
Assemble as shown in Fig. 5. The nut should be tightened to a recommended 55 in/pds of  
torque. Note the orientation of the flanged washers whereby the large diameter of washer  
should bear against the wheel. Under no condition should the washers be reversed.  
Caution: The grinding wheels must always be checked for cracks of imperfections.  
This is done with the “ring test”. Tap the wheel gently near the outer rim with the handle of a  
screwdriver; you should hear a clear bell-like ringing. If a dull thud occurs do not use the  
wheel! This means the wheel has been damaged and will, most likely, come apart during  
normal operations.  
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MAINTENANCE  
WARNING! Make sure this tool is disconnected from its power source before attempting  
any maintenance, cleaning, or inspection.  
Maintain your tools. It is recommended that the general condition of any tool be exam-  
ined before it is used. Keep your tools in good repair by adopting a program of conscien-  
tious repair and maintenance in accordance with the recommended procedures found in  
this manual. If any abnormal vibrations or noise occurs, turn the tool off immediately and  
have the problem corrected before further use. Have necessary repairs made by qualified  
service personnel.  
Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting  
edges are less likely to bind and are easier to control. Keep handles dry, clean, and free  
from oil and grease.  
Cleaning. Use only soap and a damp cloth to clean your tools. Many household cleaners  
are harmful to plastics and other insulation. Never let liquid get inside a tool.  
WARRANTY  
One Year Warranty  
For warranty questions, call 1-800-222-5381  
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DIAGRAM & PARTS LIST  
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