Foreword

We are proud to offer the Model H7758/H7759 8" & 10" Bench Grinders. These machines are part of a growing Grizzly family of fine woodworking machinery. When used according to the guide- lines set forth in this manual, you can expect years of trouble-free, enjoyable operation and proof of Grizzly???s commitment to customer satis- faction.

We are pleased to provide this manual with the Model H7758/H7759. It was written to guide you through assembly, review safety considerations, and cover general operating procedures.

The specifications, drawings, and photographs illustrated in this manual represent the Model H7758/H7759 as supplied when the manual was prepared. For your convenience, we always keep current Grizzly manuals available on our website at www.grizzly.com. Any updates to your machine will be reflected in these manuals as soon as they are complete.

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Contact Info

If you have any comments regarding this manual, please write to us at the address below:

Grizzly Industrial, Inc.

C/O Technical Documentation Manager

P.O. Box 2069

Bellingham, WA 98227-2069

Email: manuals@grizzly.com

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

H7758/H7759 8" & 10" Bench Grinders

1.READ THROUGH THE ENTIRE MANUAL

BEFORE STARTING MACHINERY.

Machinery presents serious injury hazards to untrained users.

2.ALWAYS USE ANSI APPROVED

SAFETY GLASSES WHEN OPERATING MACHINERY. Everyday eyeglasses only have impact resistant lenses, they are NOT safety glasses.

3.ALWAYS WEAR AN ANSI APPROVED

RESPIRATOR WHEN OPERATING

MACHINERY THAT PRODUCES DUST.

Wood dust is a carcinogen and can cause cancer and severe respiratory illnesses.

4.ALWAYS USE HEARING PROTECTION

WHEN OPERATING MACHINERY.

Machinery noise can cause permanent hearing damage.

5.WEAR PROPER APPAREL. DO NOT wear loose clothing, gloves, neckties, rings, or jewelry which may get caught in moving parts. Wear protective hair covering to con- tain long hair and wear non-slip footwear.

6.NEVER OPERATE MACHINERY WHEN

TIRED, OR UNDER THE INFLUENCE OF DRUGS OR ALCOHOL. Be mentally alert at all times when running machinery.

7.ONLY ALLOW TRAINED AND PROP-

ERLY SUPERVISED PERSONNEL TO OPERATE MACHINERY. Make sure operation instructions are safe and clearly understood.

8.KEEP CHILDREN AND VISITORS AWAY.

Keep all children and visitors a safe dis- tance from the work area.

9.MAKE WORKSHOP CHILD PROOF. Use padlocks, master switches, and remove start switch keys.

10.NEVER LEAVE WHEN MACHINE IS RUNNING. Turn power OFF and allow all moving parts to come to a complete stop before leaving machine unattended.

11.DO NOT USE IN DANGEROUS ENVIRONMENTS. DO NOT use machin- ery in damp, wet locations, or where any flammable or noxious fumes may exist.

12.KEEP WORK AREA CLEAN AND WELL LIT. Clutter and dark shadows may cause accidents.

13.USE A GROUNDED EXTENSION CORD

RATED FOR THE MACHINE AMPERAGE.

Undersized cords overheat and lose power. Replace extension cords if they become damaged. DO NOT use extension cords for 220V machinery.

14.ALWAYS DISCONNECT FROM POWER

SOURCE BEFORE SERVICING MACHINERY. Make sure switch is in OFF position before reconnecting.

15.MAINTAIN MACHINERY WITH CARE.

Keep blades sharp and clean for best and safest performance. Follow instructions for lubricating and changing accessories.

16.MAKE SURE GUARDS ARE IN PLACE

AND WORK CORRECTLY BEFORE

USING MACHINERY.

17.REMOVE ADJUSTING KEYS AND WRENCHES. Make a habit of checking for keys and adjusting wrenches before turn- ing machinery ON.

18.CHECK FOR DAMAGED PARTS BEFORE USING MACHINERY. Check for binding and alignment of parts, broken parts, part mounting, loose bolts, and any other conditions that may affect machine operation. Repair or replace damaged parts.

19.USE RECOMMENDED ACCESSORIES.

Refer to the instruction manual for recom- mended accessories. The use of improper accessories may cause risk of injury.

20.DO NOT FORCE MACHINERY. Work at the speed for which the machine or acces- sory was designed.

21.SECURE WORKPIECE. Use clamps or a vise to hold the workpiece when practi- cal. A secured workpiece protects your hands and frees both hands to operate the machine.

22.DO NOT OVERREACH. Keep proper foot- ing and balance at all times.

23.MANY MACHINES WILL EJECT THE

WORKPIECETOWARDTHEOPERATOR.

Know and avoid conditions that cause the workpiece to "kickback."

24. ALWAYS LOCK MOBILE BASES

(IF USED) BEFORE OPERATING

MACHINERY.

25.BE AWARE THAT CERTAIN DUST MAY BE HAZARDOUS to the respiratory sys- tems of people and animals, especially fine dust. Make sure you know the hazards associated with the type of dust you will be exposed to and always wear a respirator approved for that type of dust.

1.EYE PROTECTION. Grinding ejects small particles at a high rate of speed. ALWAYS wear safety glasses when using this machine.

2.MOUNTING TO BENCH/STAND. An unse- cured grinder may become dangerously out of control during operation. Make sure grinder is FIRMLY secured to a bench/ stand before use.

3.WHEEL SPEED RATING. Wheels oper- ated at a faster speed than rated for may break or fly apart. Before mount- ing a new wheel, be sure the wheel RPM rating is equal or higher than the speed of the grinder.

4.WHEEL FLANGES. Only use the flanges included with the grinder when mounting wheels. Other flanges may not properly secure the wheel and cause an accident.

5.RING TEST. Perform a "ring test" on grind- ing wheels before installation to ensure that they are safe to use. A wheel that does not pass the ring test may break or fly apart during operation.

6.STARTING GRINDER. If a wheel is dam- aged, it will usually fly apart shortly after start-up. To protect yourself, always stand to the side of the grinder when turning it ON and allow it to gain full speed before standing in front of it.

7.LUNG PROTECTION. Grinding produces hazardous dust, which may cause long- term respiratory problems. Always wear a NIOSH approved dust mask or respirator when grinding.

8.SIDE GRINDING. Grinding on the side of wheels can cause the them to break and fly apart???unless the wheel is rated for side grinding.

9.TOP GRINDING. Grinding on the top of wheels greatly increases the risk of workpiece kickback. Always grind on the downward part of the wheel.

10.HAND/WHEEL CONTACT. Grinding wheels can remove a lot of skin fast. Keep a firm grip on the workpiece and position your hands a safe distance away when grinding. Avoid wearing gloves as they may get caught in the grinding wheel and cause even more serious entanglement injuries.

11.TOOL REST POSITION. If the tool rest is too far away from the wheel, the workpiece may be pulled down, causing loss of con- trol and pulling your hand into the grinding wheel. Keep the tool rest within 1???8" from the wheel when operating.

12.CRACKED WHEEL. Cracked wheels may break and fly apart during operation. Replace cracked wheels immediately!

Like all machinery there is potential danger when operating this machine. Accidents are frequently caused by lack of familiarity or failure to pay attention. Use this machine with respect and caution to lessen the pos- sibility of operator injury. If normal safety precautions are overlooked or ignored, seri- ous personal injury may occur.

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No list of safety guidelines can be complete. 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 do so could result in serious per- sonal injury, damage to equipment, or poor work results.

H7758/H7759 8" & 10" Bench Grinders

110V Operation

Serious personal injury could occur if you connect the machine to the power source before you have completed the set up pro- cess. DO NOT connect the machine to the power source until instructed to do so.

Amperage Draw

Circuit Requirements

We recommend connecting this machine to a dedicated circuit with a verified ground, using the circuit breaker size given below. Never replace a circuit breaker with one of higher amperage with- out consulting a qualified electrician to ensure compliance with wiring codes. If you are unsure about the wiring codes in your area or you plan to connect your machine to a shared cir- cuit, you may create a fire hazard???consult a qualified electrician to reduce this risk.

Circuit Breaker.......................................15 Amps

Plug/Receptacle Type

Included Plug Type........................... NEMA 5-15

Figure . Typical type 5-15 plug and receptacle.

H7758/H7759 8" & 10" Bench Grinders

Electrocution or fire could result if this machine is not grounded correctly or if your electrical configu- ration does not comply with local and state codes. Ensure compliance by checking with a qualified electrician!

This machine must have a ground prong in the plug to help ensure that it is grounded. DO NOT remove ground prong from plug to fit into a two-pronged outlet! If the plug will not fit the outlet, have the proper outlet installed by a qualified electrician.

Extension Cords

We do not recommend the use of extension cords, if you find it absolutely necessary:

???Use at least a 14 gauge cord that does not exceed 50 feet in length!

???The extension cord must also contain a ground wire and plug pin.

???A qualified electrician MUST size cords over 50 feet long to prevent motor damage.

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Set Up Safety

This machine presents serious injury hazards to untrained users. Read through this entire manu- al to become familiar with the controls and opera- tions before starting the machine!

Wear safety glasses dur- ing the entire set up pro- cess!

The Model H7758/H7759 is a heavy machine. DO NOT over-exert yourself while unpacking or mov- ing your machine???get assistance.

Items Needed for Set Up

The following items are needed to complete the set up process, but are not included with your machine:

Unpacking

The Model H7758/H7759 was carefully packed when it left our warehouse. If you discover the machine is damaged after you have signed for delivery, please immediately call Customer Service at (570) 546-9663 for advice.

Save the containers and all packing materials for possible inspection by the carrier or its agent.

Otherwise, filing a freight claim can be difficult.

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

Inventory &

Assembly

Use the list below and Figures 1 & 2 to inventory and assemble your grinder.

In the event that any nonproprietary parts are missing (e.g. a nut or a washer), we would be glad to replace them, or for the sake of expedi- ency, replacements can be obtained at your local hardware store.

H7758/H7759 8" & 10" Bench Grinders

EYE SHIELDS are the first level of protec- tion from flying debris or sparks and MUST be installed before operating the grinder.

Figure 2. H7759 assembly.

NOTICE

Some hardware/fasteners in the inventory list may arrive pre-installed on the machine. Check these locations before assuming any items from the inventory list are missing.

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Mount the grinder on a workbench or stand (see Page 16) that 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.

The grinder can be mounted by drilling a holes in your workbench and securing the grinder with hex bolts, washers, and hex nuts. Or, you can secure it directly into the workbench with lag screws and flat washers. (Mounting hardware is not provided due to the many possible set ups and workbench thicknesses.)

When locating your grinder, remember:

???You'll need room for potentially large workpieces.

???Grinding spreads dust in the immediate vicin- ity of the grinder.

???Grinding creates flying sparks that MUST be out of reach of any flammables.

???You'll need a lot of light around the grinding wheel.

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The test run ensures that the grinder and wheels did not get damaged during shipping.

To test run the grinder:

1.Review and understand the grinder safety information on Page 6.

2.Plug the grinder into the power source.

3.Stand away from the line of rotation of the wheel, turn the grinder ON, and allow it to run for one minute.

???The grinder should run smoothly.

???If there is an obvious problem with the way the grinder is running, turn it OFF immedi- ately and troubleshoot the problem, using the troubleshooting table on Page 17. DO NOT operate the grinder until it is fixed.

H7758/H7759 8" & 10" Bench Grinders

Damage to your eyes, lungs, and ears could result from using this machine without proper protective gear. Always wear safety glasses, a respirator, and hearing protection when operating this machine.

Loose hair and cloth-

ing could get caught in

machinery and cause seri-

ous personal injury. Keep

loose clothing and long hair away from moving machinery.

NOTICE

If you have never used this type of machine or equipment before, WE STRONGLY REC- OMMEND that you read books, trade maga- zines, or get formal training before begin- ning any projects. Regardless of the con- tent in this section, Grizzly Industrial will not be held liable for accidents caused by lack of training.

H7758/H7759 8" & 10" Bench Grinders

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 flammable materials.

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

???Wear the proper protective clothing. Particles flying off of a grinding wheel will be travel- ing very fast???prepare for this. Wear safety glasses/face shield, a dust mask, earplugs, a leather apron, and heavy leather boots.

???Grasp the workpiece firmly and properly support it on the tool rest during grinding. Maintain even pressure and control of the workpiece when grinding.

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

??? DO NOT grind on the side of the wheel. The wheels provided with the Model H7758/ H7759 are not designed for side grinding.

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Your safety when grinding depends, on a large part, on the condition of the wheel during grind- ing. A wheel in poor condition presents the pos- sibility of breaking apart during rotation and injur- ing 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 inappropriate for the wheel type.

???Select the right wheel for the machine. 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 Replacement instructions on Page 15 for guidance.) 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 grind- ing wheels properly. Ask a trusted person with experience or consult with your local library to learn more.

???Always spin water/coolant out of the wheel before turning the grinder OFF. This may take 5???10 minutes. (If moisture is left on the wheel, the wheel may warp.)

???Do not store wheels in damp or wet loca- tions.

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

???Replace wheels when the diameter becomes 2" smaller than its original size.

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The Model H7758 only accepts Type 1 wheels with a 5???8" bore. The Model H7759 only accepts Type 1 wheels with a 11???4" 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 wheel type (eg, Type 1 wheels).

The most common Abrasive Types used are A for Aluminum Oxide, 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. Ten 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.

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

H7758/H7759 8" & 10" Bench Grinders

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, do 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, do 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 3, gently tap the wheel with a light non-metallic device such as the handle of a screwdriver or a wooden mallet.

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Figure 3. Tapping locations when performing a ring test.

H7758/H7759 8" & 10" Bench Grinders

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 Dressing

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 (see Page 16). Dressing restores the abrasive quality of the wheel surface and brings the wheel edge back to a square form.

Refer to the instructions that accompany your dressing accessory for complete details on how to properly dress a wheel.

Wheel Replacement

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

To replace a grinding wheel:

1.UNPLUG THE GRINDER!

2.Remove the three 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 has left- handed threads, so the arbor nut on that side must be turned clockwise to loosen.

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 other side of the wheel.

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5.Mount the new wheel as shown in Figure 4. 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.

NEVER assemble a grinding wheel on the arbor without paper or fiber discs between the wheel and the flange. Not using the discs can put undue stress on the wheel, causing it to crack and possibly fall apart.

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Figure 4. Assembly order for wheel installation.

6.Re-install the spark deflectors and eye- shields.

7.Run a new wheel for at least one minute 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.

H7758 Replacement Wheels

Model G1982???8" Aluminum Oxide 36 Grit Model G1983???8" Aluminum Oxide 60 Grit Model G1984???8" Silicon Carbide 120 Grit

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Accessories

Model H7763???Heavy Duty Grinder Stand

H5892

H5891

H7759 Replacement Wheels

Model H8872???10" Aluminum Oxide 36 Grit Model H8874???10" Aluminum Oxide 60 Grit

H7758/H7759 8" & 10" Bench Grinders

Grinders Bench 10" & 8" H7758/H7759

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Breakdown Parts H7758

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