1.KEEP GUARDS IN PLACE and in working order.

2.REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to see that keys and adjusting wrenches are removed from tool before turning on.

3.KEEP WORK AREA CLEAN. Cluttered areas and benches invite accidents.

4.DO NOT USE IN DANGEROUS ENVI- RONMENT. Do not use power tools in damp or wet locations, or where any flam- mable or noxious fumes may exist. Keep work area well lighted.

5.KEEP CHILDREN AND VISITORS AWAY. All children and visitors should be kept at a safe distance from work area.

6.MAKE WORKSHOP CHILD PROOF with padlocks, master switches, or by removing starter keys.

7.DO NOT FORCE TOOL. It will do the job better and safer at the rate for which it was designed.

8.USE RIGHT TOOL. Do not force tool or attachment to do a job for which it was not designed.

9.USE PROPER EXTENSION CORD. Make sure your extension cord is in good condi- tion. Conductor size should be in accor- dance with the chart below. The amperage rating should be listed on the motor or tool nameplate. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Your extension cord must also contain a ground wire and plug pin. Always repair or replace exten- sion cords if they become damaged.

Minimum Gauge for Extension Cords

10.WEAR PROPER APPAREL. Do not wear loose clothing, gloves, neckties, rings, bracelets, or other jewelry which may get caught in moving parts. Non-slip footwear is recommended. Wear protective hair cov- ering to contain long hair.

11.ALWAYS USE SAFETY GLASSES. Also use face or dust mask if cutting operation is dusty. Everyday eyeglasses only have impact resistant lenses, they are NOT safety glasses.

12.SECURE WORK. Use clamps or a vise to hold work when practical. It is safer than using your hand and frees both hands to operate tool.

13.DO NOT OVER-REACH. Keep proper footing and balance at all times.

14.MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for best and safest performance. Follow instructions for lubri- cating and changing accessories.

15.USE RECOMMENDED ACCESSORIES.

Consult the owner???s manual for recom- mended accessories. The use of improper accessories may cause risk of injury.

16.REDUCE THE RISK OF UNINTENTION- AL STARTING. On machines with magnet- ic contact starting switches there is a risk of starting if the machine is bumped or jarred. Always disconnect from power source before adjusting or servicing. Make sure switch is in OFF position before reconnecting.

17.MANY WOODWORKING TOOLS CAN ???KICKBACK??? THE WORKPIECE toward the operator if not handled properly. Know what conditions can create ???kickback??? and know how to avoid them. Read the manual accom- panying the machine thoroughly.

18.CHECK DAMAGED PARTS. Before fur- ther use of the tool, a guard or other part that is damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment of moving parts, bind- ing of moving parts, breakage of parts, mounting, and any other conditions that may affect its operation. A guard or other part that is damaged should be properly repaired or replaced.

19.NEVER LEAVE TOOL RUNNING UNAT- TENDED. TURN POWER OFF. Do not leave tool until it comes to a complete stop.

20.NEVER OPERATE A MACHINE WHEN

TIRED, OR UNDER THE INFLUENCE OF DRUGS OR ALCOHOL. Full mental alert- ness is required at all times when running a machine.

21.NEVER ALLOW UNSUPERVISED OR

UNTRAINED PERSONNEL TO OPER- ATE THE MACHINE. Make sure any instructions you give in regards to machine operation are approved, correct, safe, and clearly understood.

22.IF AT ANY TIME YOU ARE EXPERIENC- ING DIFFICULTIES performing the intend- ed operation, stop using the machine! Then contact our service department or ask a qualified expert how the operation should be performed.

1.ALWAYS WEAR EYE PROTECTION!

2.MAKE SURE GRINDER IS SECURED

FIRMLY TO A BENCH OR STAND BEFORE USE. Any ???wobbles??? must be corrected by shimming or blocking before operation.

3.BEFORE MOUNTING A NEW WHEEL,

BE SURE WHEEL RPM IS RATED AT

AN EQUAL OR HIGHER RPM THAN

THE GRINDER.

4.DO NOT GRIND ON THE SIDES OF THE GRINDING WHEELS, unless they are special wheels designed specifically for this purpose.

5.ONLY USE FLANGES THAT ARE

INCLUDED WITH THE GRINDER.

6.WEAR AN APPROVED DUST MASK OR RESPIRATOR. Grinding operations produce dust.

7.REPLACE A CRACKED WHEEL IMME- DIATELY. DO NOT use a grinding wheel that has cracks or flaws. Before using, inspect each wheel. Handle wheels care- fully to avoid bumping or dropping.

8.DO NOT stand directly in front of grinding wheels when turning machine on.

9.PERFORM a ???ring test??? (see page 12) on grinding wheels to ensure that they are safe for use. Always inspect grinding wheels before operation.

10.HOLD THE WORKPIECE FIRMLY

WHILE GRINDING.

11.DO NOT allow your hands to come into contact with grinding wheels during oper- ation. Abrasive accessories have the ability to remove a lot of material, includ- ing skin, very quickly. However, do not wear gloves while grinding, they may get caught in the grinding wheel.

12.KEEP TOOL REST AS CLOSE AS

POSSIBLE TO GRINDING WHEEL.

13.NEVER GRIND BY PLACING THE

WORKPIECE ON TOP OF THE WHEEL. The wheel may kick the work- piece toward the operator. Always grind on the downward part of the wheel.

To operate this or any power tool safely and efficiently, become as familiar with it as possible. The time you invest before you begin to use your Model H4378/H4379 will be time well spent. DO NOT operate this machine until you are completely familiar with the contents of this manual, or serious personal injury may occur.

No list of safety guidelines can be com- plete. Every shop environment is different. Always consider safety first, as it applies to your individual working conditions. Use this and other machinery with caution and respect. Failure to follow guidelines could result in serious personal injury, damage to equipment or poor work results.

110V Operation

The Model H4378 is wired for 110V and will draw 2.5 amps. The Model H4379 is wired for 110V and will draw 3.5 amps. If you operate this machine on any circuit that is already close to its capacity, it might blow a fuse or trip a circuit breaker. However, if an unusual load does not exist and a power failure still occurs, contact a qualified elec- trician or our service department.

A 10 amp dedicated circuit should be used with this grinder. Always check to see if your current wires are capable of handling a 10 amp load. If you are unsure, consult the advice of a qualified electrician.

Extension Cords

If you find it necessary to use an extension cord with the Model H4378/H4379, make sure the cord is rated Hard Service (grade S) or better. Refer to the chart in the standard safety instructions to determine the minimum gauge for the extension cord. The extension cord must also contain a ground wire and plug pin. Always repair or replace extension cords when they become worn or dam- aged.

Grounding

In the event of an electrical short, grounding reduces the risk of electric shock by providing electric current a path of least resistance. This tool is equipped with a power cord having an equipment-grounding conductor. See Figure 1B. The outlet must be properly installed and ground- ed in accordance with all local codes and ordi- nances.

H4378/H4379 Slimline Bench Grinder

This equipment must be grounded. Verify that any existing electrical outlet and circuit you intend to plug into is actually grounded. Under no cir- cumstances should the grounding pin from any three-pronged plug be removed. Serious injury may occur.

Figure 1A. Do not remove grounding pin.

Figure 1B. Typical 110V plug and outlet.

-5-

Commentary

We are proud to offer the Grizzly Model H4378/H4379 Slimline Bench Grinder. The Model H4378/H4379 is part of a growing Grizzly family of fine woodworking machinery. When used accord- ing to the guidelines set forth in this manual, you can expect years of trouble-free, enjoyable oper- ation and proof of Grizzly???s commitment to cus- tomer satisfaction.

The Model H4378 offers a 1???3 HP, 3450 RPM motor and a 6" grinding wheel. The Model H4379 offers a 1???2 H.P., 3450 RPM motor and an 8" grind- ing wheel.

A number of grinding wheels for the Model H4378/H4379 are available through the Grizzly catalog.

We are also pleased to provide this manual with the Model H4378/H4379. It was written to guide you through assembly, review safety considera- tions, and cover general operating procedures. This manual represents our effort to produce the best documentation possible. If you have any comments regarding this manual, please write to us at the address below:

Grizzly Industrial, Inc.

C/O Technical Documentation

P.O. Box 2069

Bellingham, WA 98227-2069

Most importantly, we stand behind our machines. If you have any service questions or parts requests, please call or write us at the location listed below:

Grizzly Industrial, Inc.

1203 Lycoming Mall Circle

Muncy, PA 17756

Phone: (570) 546-9663

Fax: (800) 438-5901 E-Mail: techsupport@grizzly.com Web Site: http://www.grizzly.com

The specifications, drawings, and photographs illustrated in this manual represent the Model H4378/H4379 as supplied when the manual was prepared. However, owing to Grizzly???s policy of continuous improvement, changes may be made at any time with no obligation on the part of Grizzly. Whenever possible, though, we send manual updates to all owners of a particular tool or machine. Should you receive one, we urge you to insert the new information with the old and keep it for reference.

Read the manual before assembly and opera- tion. Become familiar with the machine and its operation before begin- ning any work. Serious personal injury may result if safety or opera- tional information is not understood or followed.

Unpacking

The Model H4378/H4379 is shipped from the manufacturer in a carefully packed carton. If you discover the machine is damaged after you have signed for delivery, immediately call Customer Service for advice.

When you are completely satisfied with the con- dition of your shipment, you should inventory its parts.

Some metal parts may have sharp edges on them after they are formed. Please examine the edges of all metal parts before handling them. Failure to do so could result in injury.

Piece Inventory

After all the parts have been removed from the carton, you should have:

???Grinder

???Bolts (4)

???Washers (6)

???Knobs (2)

???Adjustable Rests (2)

???Eye Shields (2)

???Spark Breakers (2)

???Cooling Tray

NOTICE

A full parts list and breakdown can be found toward the end of this manual. For easier assembly, or to identify specific parts, please refer to the detailed illustrations at the end of the manual.

NOTICE

When mounted, the cooling tray can be easi- ly damaged if the grinder is tipped forward.

The Model H4378/H4379 weighs 22/27 lbs. Make sure the workbench on which you plan to mount the grinder is sturdy enough to hold the weight of the machine and any downward pressure that may be applied during operation. The workbench should have a level surface and be heavy, or attached to the floor, so it will not move during operation. To mount the grinder:

???Pick a spot on the workbench that will allow enough room to move the size of an antici- pated workpiece around the grinder. The operator (and possibly bystanders) should have enough room to stand out of the way in an emergency.

???Mount the grinder to the workbench with bolts that are long enough to exceed the thickness of your workbench and the grinder base. Secure each bolt with flat washers, a lock washer and a hex nut. Because sizes vary for each individual situation, the hard- ware in this step is not included with the Model H4378/H4379.

???Mount the grinder in an area with proper lighting and near electrical outlets. Lighting should be bright enough to eliminate shadow and prevent eye strain. Electrical circuits should be dedicated or large enough to han- dle amperage requirements. Keep power or extension cords clear of high-traffic areas. Observe local electrical codes for proper installation of new lighting, outlets, or circuits.

Make your shop ???child safe.??? Ensure that your workplace is inaccessible to children by closing and locking all entrances when you are away. Never allow visitors in your shop when assembling, adjusting, or operating equipment.

The tool rest provides a surface that can be used to support the workpiece during grinding. Certain types of grinding may require jigs or accessories to assure the proper angle of the workpiece against the wheel.

The tool rest attaches to the inward side of the wheel guard; it should be positioned as close to the grinding wheel as possible. Insert the 1???2" x 1???4" hex bolt with a flat washer and a lock washer through the rest support, and thread it into the tapped hole. Repeat this installation for the oppo- site side wheel. The tool rest can be adjusted by loosening these bolts and moving the bracket. Always retighten before using the machine.

Eye Shields

OSHA requires that the eye shield be positioned between the grinding wheel and the operator???s face during grinding. This lessens the possibility of sparks or metal bits flying directly at the opera- tor.

Attach each support bracket to the top end of the wheel rim guards with the knob bolts. Note that the brackets are slotted to allow up and down adjustments.

Snap the eye shields into the grooves on the sup- port brackets. The shields should be able to swiv- el up and down.

Keep loose clothing rolled up and out of the way of machinery and keep hair pulled back.

!Disconnect power to the machine when perform-

ing any maintenance, assembly or adjust- ments. Failure to do this may result in serious per- sonal injury.

Wear safety glasses dur- ing the entire operation process. Failure to com- ply may result in serious personal injury.

Using this machine pro- duces dust which may cause allergic reactions and respiratory problems. Use an approved dust mask to protect yourself from these hazards!

NOTICE

The following section was designed to give instructions on the basic operations of this grinder. However, it is in no way comprehen- sive of every grinder application. There are many different grinding wheels and attach- ments available for grinders. WE STRONGLY RECOMMEND that you read books, trade magazines, or get formal training to maxi- mize the potential of your machine.

Test Run

Once mounting is complete and adjustments are done to your satisfaction, you are ready to test the machine.

Plug the grinder into the power source. Stand away from the line of rotation of the wheel and turn the grinder ON. The grinder should run smoothly with little or no vibration or rubbing nois- es. Strange or unnatural noises should be investi- gated and corrected before operating the machine further. If the grinder seems okay, stay out of the line of rotation and let it run for 1-2 min- utes to make sure the wheel is structurally sound.

If you cannot easily locate the source of an unusual noise or vibration, feel free to contact our service department for help.

The grinder is a safe tool when used properly. In addition to the safety instructions in this manual, the most important safety consideration is to use common sense at all times. What may be okay in one situation, may not be safe in another.

Here are some tips to keep in mind while grinding:

???Make sure all guards are in place.

???Remember that grinding often produces sparks. DO NOT allow anyone to stand in the path of the sparks. DO NOT grind near flam- mable liquids or gases.

???Maintain proper care of your wheels. Read the ???Wheel Care??? instructions for ideas on how to go about doing this.

???Wear the proper protective clothing. Remember that particles flying off of a grind- ing wheel will be traveling very fast???prepare for this. Wear safety glasses, a dust mask, earplugs, a leather apron, arm guards, a hardhat and heavy leather boots.

???Grasp the workpiece tight and properly sup- port it on the tool rest during operation. DO NOT lean into the workpiece in a manner that may cause your hands to move into the spin- ning wheel if the workpiece slips off.

???Concentrate on the task at hand. STOP grinding if other people are distracting you. STOP grinding if your mind is on something else.

???DO NOT grind on the side of the wheel. Although side grinding is permissible for some wheel types, the Model H4378/H4379 is not designed for side grinding.

Your safety when grinding depends, on a large part, on the condition of the wheel during grinding. A wheel in poor condition presents the possibility of breaking apart during rotation and injuring the operator and possibly causing property damage.

Here are some tips to help you avoid breaking the wheel:

???Always transport, store and handle wheels with care. Wheels may be damaged if they are dropped or if heavy objects are stacked on them.

???Select the right grinding wheel for the job. Do not grind material that is not designed for the wheel.

???Select the right machine for the wheel. A machine that rotates at a higher RPM than the wheel is rated for may cause the wheel to fly apart.

???Mount the wheels properly. (See the ???Wheel Mounting??? instructions on page 13 for guid- ance.) Never use a wheel with the wrong arbor size for the grinder.

???Do not abuse the wheel by jamming the work into the grinding wheel with excessive force.

???Learn how to use the grinder and the grinding wheels properly. Ask a trusted person with experience or consult with your local library to learn more.

???If using coolant, always spin it out of the wheel before turning off the power.

???Grinding on side of the wheel may cause wheel damage.

Wheel Selection

The Model H4378 only accepts Type-1 wheels with a 1???2" bore. The Model H4379 only accepts Type-1 wheels with a 5???8" bore.

Aluminum oxide and silicon carbide wheels are marked in a somewhat uniform manner by all the major manufacturers. Understanding these mark- ings will help you understand the capabilities of various wheels. Always refer to the manufactur- er???s grinding recommendations when selecting a wheel for your project.

The basic format for wheel numbering is:

The Prefix is the manufacturer???s designation for a particular type.

The most common Abrasive Types used are A for Aluminum Oxide and C for Silicon Carbide, and occasionally SG for Seeded Gel.

The Grit Size is a number that refers to the size of the abrasive grain in the wheel. The lower the number, the coarser the wheel. 10 is a very coarse wheel for roughing and 220 is usually the upper range for fine finish work.

Grade is an indication of the hardness of the wheel??????A??? being the softest and ???Z??? being the hardest.

Bond Type refers to the type of bonding material used to hold the abrasive material. Most general purpose wheels will have a ???V??? indicating Vitrified Clay is used. Vitrified Clay provides high strength and good porosity. The other common bond type is ???B??? for resin where synthetic resins are used. These are used to grind cemented carbide and ceramic materials.

There may be other numbers inserted that have meaning for a particular type of wheel. Refer to the manufacturer???s technical data for a complete explanation.

Wheel Inspection

Before mounting a new grinding wheel, it must be inspected. Do not assume that a wheel is in sound condition just because it is new???often, damage can occur in shipping, with age, or with exposure to moisture.

First, the wheel should be given a Visual Inspection. Look for any cracks, chips, nicks or dents in the surface of the wheel. If you see any of these, DO NOT use the wheel.

Second, the wheel should be given a Ring Test. This test will give you an indication of any internal damage that may not be obvious during a visual inspection.

To perform a Ring Test:

1.Make sure the wheel that you test is clean and dry; otherwise, you may get false results.

2.If size permits, balance the wheel with your finger in the hole. If this is not possible, hang the wheel in the air with a piece of cord or string looped through the hole in the center.

3.At the spots shown in Figure 2, gently tap the wheel with a light non-metallic device such as the handle of a screwdriver or a wooden mal- let.

STOP

Rated 3500 RPM Make sure your grinder is not

faster than the rated RPM of this wheel

WARNING

Grinding can be dangerous Visually inspect this wheel for cracks, nicks,chips

Figure 2. Ring test tapping locations.

4.An undamaged wheel will emit a clear metal- lic ring or ???ping??? sound in each of these spots. A damaged wheel will respond with a dull thud that has no clear tone.

5.If you determine from the ring test that the wheel is damaged, DO NOT use it!

Wheel Mounting

The wheel guard assembly must be removed in order to mount or dismount a grinding wheel. To do this:

1.Disconnect the grinder from the power supply!

2.Remove the 3 Phillips head screws and nuts that go through the outer guard. Take off the outer guard and the rim guard.

3.Use a wrench on the nut that holds the wheel on the arbor. Hold the wheel from turning with your other hand. Note that the wheel on the left-hand side of the machine is a left- handed thread, so loosening it will require turning it clockwise.

4.Remove the outer wheel flange and the paper disc. Pull the wheel free from the arbor. There will also be a paper disc and a wheel flange on the back side of the wheel.

5.Mount the new wheel in the reverse order or as shown in Figure 3. Always make certain there is a paper or fiber disc between the wheel flanges and the wheel itself. Tighten the nut snugly but DO NOT over-tighten. Over-tightening can crack the wheel.

6.Re-install the guards and shields.

7.Run a new wheel for at least 1-2 minutes while standing clear of the line of rotation. If a wheel does have defects it will generally fail as soon as it gets up to full speed.

Paper/Fiber

Disc

Figure 3. Wheel mounting order.

NEVER assemble a grinding wheel on the arbor without paper or fiber discs between the wheel and the flange. Omitting the discs can put undue stress on the wheel, causing it to crack and possibly fall apart.

ALWAYS visually inspect and perform a ???ring test??? on a wheel before assembly. DO NOT use damaged wheels!

!Disconnect power to the machine when perform-

ing any maintenance, assembly or adjust- ments. Failure to do this may result in serious personal injury.

General

Always be aware of the condition of your grinder. Routinely check the condition of the following items and repair or replace as necessary:

???Loose mounting bolts

???Worn switch

???Worn or damaged cord

???Worn or damaged support bearings or guide bearings

???Damaged grinding wheel

???Any other condition that could hamper the safe operation of this machine.

NOTICE

If the grinder is unmounted from the work- bench for maintenance, the cooling tray can be easily damaged if the grinder is tipped for- ward.

Lubrication

Sealed and pre-lubricated ball bearings require no lubrication for the life of the bearings. All bear- ings are standard sizes, and replacements can be purchased from our parts department or a bearing supply store.

Grinding Wheels

The grinding wheel should be inspected before every use. Use the ???ring test??? method from page 12 ???Wheel Mounting??? instructions to verify the structural integrity. If using coolant during grind- ing, always run the wheel for 5-10 minutes at the end of the operation to remove any coolant from the wheel. Take care in storing grinding wheels to keep them free from potential damage by being dropped or having other items dropped on them.

Replace the wheel when the wheel diameter is reduced to 4" on the Model H4378 and 6" on the Model H4379. Operating at anything less than this diameter does not allow the proper alignment of the tool rest and the eye shield.

Depending on the type of grinding you do, the grinding wheel may require periodic dressing. There are several different types of wheel dress- ing devices available on the market. Use a suit- able diamond or silicon carbide stick type dress- er. Sweep it smoothly and evenly several times across the face of the wheel. Dressing restores the abrasive quality of the wheel surface, plus it will bring the wheel edge back to a square form. Refer to the instructions that accompany your dressing accessory for complete details on wheel dressing.

The following pages contain general machine data, parts diagrams/lists, a troubleshooting guide and Warranty/Return information for your Model H4378/H4379.

If you need parts or help in assembling your machine, or if you need operational information, we encourage you to call our Service Department. Our trained service technicians will be glad to help you.

If you have comments dealing specifically with this manual, please write to our Bellingham, Washington location using the address in Section 3: Introduction.

We have included some important safety mea- sures that are essential to the operation of this machine. While most safety measures are gener- ally universal, Grizzly reminds you that each workshop is different and safety rules should be considered as they apply to your specific situa- tion.

Operating this equipment creates the poten- tial for flying debris to cause eye injury. Always wear safety glasses or goggles when operating equipment. Everyday glass- es or reading glasses only have impact resistant lenses, they are not safety glasses. Be certain the safety glasses you wear meet the appropriate standards of the American National Standards Institute (ANSI).

We recommend you keep a copy of our current catalog for complete information regarding Grizzly's warranty and return policy. If you need additional technical information relating to this machine, or if you need general assistance or replacement parts, please contact the Service Department listed in Section 3: Introduction.

Additional information sources are necessary to realize the full potential of this machine. Trade journals, woodworking magazines, and your local library are good places to start.

The Model H4378/H4379 was specifically designed for grinding. DO NOT MODIFY

AND/OR USE THIS MACHINE FOR ANY OTHER PURPOSE. Modifications or improper use of this tool will void the war- ranty. If you are confused about any aspect of this machine, DO NOT use it until all your questions have been answered or serious personal injury may occur.

Like all power tools, there is danger asso- ciated with the Model H4378/H4379. Accidents are frequently caused by lack of familiarity or failure to pay attention. Use this tool with respect and caution to lessen the possibility of operator injury. If normal safety precautions are overlooked or ignored, serious personal injury may occur.

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1.How did you learn about us?

___Other__________________________________________________

2.Which of the following magazines do you subscribe to.

___Other__________________________________________________

3.Which of the following woodworking/remodeling shows do you watch?

___Other__________________________________________________

4.What is your annual household income?

5.What is your age group?

6.How long have you been a woodworker?

7.How would you rank your woodworking skills?

8.What stationary woodworking tools do you own? Check all that apply.

___Other__________________________________________________

10.Which benchtop tools do you own? Check all that apply.

___Other__________________________________________________

11.How many of the machines checked above are Grizzly? ____________

12.Which portable/hand held power tools do you own? Check all that apply.

___Other__________________________________________________

13.What machines/supplies would you like Grizzly Industrial to carry?

__________________________________________________________

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14.What new accessories would you like Grizzly Industrial to carry?

__________________________________________________________

__________________________________________________________

15.What other companies do you purchase your tools and supplies from?

__________________________________________________________

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16.Do you think your purchase represents good value?

17.Would you recommend Grizzly Industrial to a friend?

18.Would you allow us to use your name as a reference for Grizzly customers in your area? Note: We never use names more than three times.

19.Comments:_________________________________________________

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