Setup: ATD-10556 / ATD-10558 Bench Grinder Owner Manual

Overview

The ATD-10556 / ATD-10558 Bench Grinder is a heavy-duty, double-wheel sharpening and deburring machine for workshops, garages, and maintenance areas. It uses an induction motor, metal tool rests, spark guards, adjustable eye shields, and two grinding wheels for shaping and refining metal tools.

The ATD-10556 is the compact 6-inch model, while the ATD-10558 provides an 8-inch grinding capacity and higher motor output. Typical applications include sharpening chisels, axes, screwdrivers, drill bits, and other cutting tools, as well as removing burrs from cut metal.

Specifications

ATD-10556

• Motor type: Induction motor
• Electrical rating: 120 V AC, 2.8 A, 60 Hz
• Motor output: 1/2 HP
• Wheel diameter: 6 inches (15 cm)
• Wheel width: 3/4 inch (20 mm)
• Arbor hole: 1/2 inch (13 mm)
• No-load speed: 3,450 RPM
• Included wheel grits: 36 coarse and 60 medium

ATD-10558

• Motor type: Induction motor
• Electrical rating: 120 V AC, 4.8 A, 60 Hz
• Motor output: 3/4 HP
• Wheel diameter: 8 inches (20 cm)
• Wheel width: 1 inch (25.4 mm)
• Arbor hole: 5/8 inch (16 mm)
• No-load speed: 3,450 RPM
• Included wheel grits: 36 coarse and 60 medium

Detailed Description

The ATD-10556 / ATD-10558 Bench Grinder has a motor-driven spindle with a grinding wheel on each side. The coarse wheel removes material quickly, while the medium wheel provides a finer grinding action for sharpening and finishing.

Both models include a rigid base with pre-cast mounting holes, metal work rests, spark deflectors, wheel guards, and a dust-resistant rocker switch. A flexible work light improves visibility around the grinding area; the light bulb is not included.

The grinder includes one standard eye shield and one magnifying eye shield. Each shield can be adjusted to suit the operator’s viewing position. A coolant tray is positioned below the grinding area so heated workpieces can be cooled during use.

Named external parts include the on/off switch, base, mounting holes, wheel guards, spark guards, tool rests, eye shields, flexible lamp, and coolant tray. Internal assemblies include the induction motor, rotor, stator, bearings, capacitor, spindle hardware, and wheel flanges.

Package Contents

• Left and right work rests
• One plain eye shield
• One magnifying eye shield
• Two eye-shield mounting rods
• Eye-shield brackets, bolts, washers, and locking knobs
• Two work-rest fixing knobs with washers
• One coolant tray
• Two spark deflectors with adjustment hardware
• One coarse grinding wheel and one medium grinding wheel

Safety

• Read and understand the complete operating instructions before using the grinder. Anyone operating the machine should be familiar with its controls and safety requirements.
• Wear approved eye protection meeting a recognized standard such as CSA or ANSI. Use a dust mask or respirator whenever grinding creates airborne dust.
• Keep bystanders away from the work area and remove flammable liquids, gases, and materials because grinding can produce sparks.
• Keep wheel guards, spark guards, eye shields, and tool rests installed and correctly adjusted.
• Keep hands, fingers, and thumbs away from the rotating wheels. Never reach behind or underneath a wheel.
• Never grind on the side of a wheel. Use only the outside face around the wheel diameter.
• Do not use a cracked, chipped, or otherwise damaged wheel. Replace a damaged wheel immediately.
• Before each start-up, stand to one side rather than directly in front of the wheels. Allow the grinder to reach full speed and run for about one minute.
• After installing a replacement wheel, perform the same one-minute side-position test before grinding.
• Check that a replacement wheel’s maximum rated speed is at least as high as the grinder’s rated speed.
• Do not overtighten spindle nuts because excessive pressure can damage or crack the wheel.
• Unplug the grinder before changing wheels, adjusting components, or performing service. The wheels continue spinning after the switch is turned off.
• Do not operate the grinder in damp locations or expose it to rain.
• Keep loose clothing and jewelry away from the wheels, and secure long hair before operation.
• Do not use the grinding wheel to cut material.
• Use only accessories recommended for the applicable model.
• Service beyond routine maintenance should be performed by an authorized, qualified technician.

Setup and Installation

Mounting the Grinder

The grinder must be secured to a sturdy workbench or an appropriate grinding stand before use. High-speed wheel rotation can create vibration and cause an unsecured machine to move.

1. Place the grinder in the desired position on the workbench.
2. Mark the bench through the two mounting holes in the grinder base.
3. Drill mounting holes at the marked locations.
4. Secure the grinder with two suitable long bolts, flat washers, lock washers, and nuts. Mounting hardware is not supplied.

Installing the Eye Shields

1. Attach the left and right shield rods to the inside of the wheel guards using the supplied hex bolts.
2. Slide each shield bracket onto its corresponding rod.
3. Tighten the carriage bolt and locking hardware while leaving enough movement for the shield to raise and lower smoothly.
4. Set the shield so it remains in position when the locking knob is tightened.

Installing or Replacing a Grinding Wheel

1. Switch off the grinder and unplug it from the outlet.
2. Loosen the wheel-cover screws and remove the wheel cover.
3. Place a correctly sized wrench on the spindle hex nut.
4. Loosen the left-side wheel nut by turning it clockwise. Loosen the right-side wheel nut by turning it counterclockwise.
5. Remove the outer flange and the existing wheel.
6. Inspect the replacement wheel for cracks, chips, or other damage.
7. Clean the flange surfaces, then install the wheel, flange, and spindle nut.
8. Confirm that the wheel and outer flange are seated correctly on the spindle.
9. Reinstall the wheel cover and adjust the tool rest.
10. Stand to one side and run the newly installed wheel at full speed for approximately one minute before use.

Do not overtighten the spindle nut. A damaged wheel must not be installed or used.

Adjusting the Tool Rests

1. Attach each tool rest to its bracket using the supplied knob and washers.
2. Loosen the tool-rest knob without removing it.
3. Slide the rest inward or outward until the gap between the rest and wheel is no more than 1/8 inch (3.2 mm).
4. Tighten the knob securely.

Readjust the tool rest whenever wear or movement increases the gap. Maintaining the specified clearance helps prevent a workpiece from being pulled between the rest and wheel.

Operation

Starting and Stopping

1. Confirm that the switch is in the off position before connecting the power cord.
2. Stand to one side of the grinder.
3. Press the side of the rocker switch marked ON.
4. Allow the wheels to reach full speed before beginning work.
5. Press the side marked OFF when finished, then wait for both wheels to stop completely.

Grinding Technique

• Use the tool rest to support the workpiece and keep both hands clear of the wheel.
• Bring a cold workpiece to the wheel gradually instead of applying sudden pressure.
• Move the workpiece continuously across the wheel face to prevent grooves and localized overheating.
• Use light, controlled pressure. Excessive feed force can overload the motor, damage the wheel, or burn the workpiece.
• Dip the workpiece into water or oil in the coolant tray when it becomes hot.
• Never apply side pressure to a grinding wheel.
• Adjust the tool rest when working with an unusually large or irregularly shaped object.

Wheel Dressing

Use a suitable dressing tool when a wheel becomes grooved, uneven, loaded with workpiece material, or no longer round. Dressing restores a flatter, cleaner grinding surface. Replace a wheel if it cannot be safely restored. After dressing, readjust the tool rest and spark deflector.

Electrical Requirements and Extension Cords

The grinder uses a grounded electrical plug. Connect it only to a properly installed and grounded outlet that complies with applicable local requirements. Do not remove the grounding prong, modify the plug, or use an adapter. If the grounding arrangement is uncertain, have it checked by a qualified electrician.

Use only three-wire extension cords with three-prong plugs and matching three-hole outlets. Do not use damaged cords, and replace worn or damaged extension cords immediately. An undersized or excessively long cord can cause voltage drop, loss of power, and motor overheating.

• For loads above 0 and up to 6 amperes: use 18 AWG for 25 feet, 16 AWG for 50 feet, 16 AWG for 100 feet, or 14 AWG for 150 feet.
• For loads above 6 and up to 10 amperes: use 18 AWG for 25 feet, 16 AWG for 50 feet, 14 AWG for 100 feet, or 12 AWG for 150 feet.
• For loads above 10 and up to 12 amperes: use 16 AWG for 25 feet, 16 AWG for 50 feet, 14 AWG for 100 feet, or 12 AWG for 150 feet.
• For loads above 12 and up to 16 amperes: use 14 AWG for 25 feet, 12 AWG for 50 feet, and 12 AWG for 100 feet. Extension use at 150 feet is not recommended.

A separate tool circuit is recommended. The manual specifies a circuit no smaller than 12-gauge wire protected by a 15-amp time-delay fuse. Confirm that the supply voltage matches the motor nameplate before connection.

Cleaning and Maintenance

• Check the power cord before every use.
• Inspect both grinding wheels for cracks or damage before every use.
• Check moving components for misalignment, binding, or unusual movement before every use.
• Dress the grinding wheels when their surfaces become uneven, loaded, grooved, or out of round.
• Replace wheels whenever they are damaged or cannot be safely dressed.
• Clean and vacuum dust from the motor housing and other grinder components as needed.
• Replace the work-light bulb as necessary.

Use a maximum 40-watt anti-vibration bulb for the work light. Disconnect power before carrying out maintenance, cleaning, wheel dressing, or component replacement.

Troubleshooting

Motor Will Not Start

• Possible causes include low voltage, an open motor circuit, loose connections, a blown fuse, or a tripped breaker.
• Check the power source and verify that the voltage is correct.
• Inspect the cord, plug, and accessible connections for damage or looseness.
• Use the correct fuse or breaker and an appropriately sized circuit.
• Have internal motor faults serviced by a qualified technician.

Fuses or Circuit Breakers Trip

• Inspect the cord and plug for damaged insulation or shorted wires.
• Check for loose motor terminals, short circuits, or worn insulation.
• Verify that the circuit protection matches the grinder and electrical supply.

Motor Overheats

• Reduce the pressure and load applied to the grinding wheel.
• Use an extension cord with the correct gauge and length, or connect the grinder directly to a suitable outlet.

Motor Stalls

• Reduce the workpiece feed pressure.
• Correct low-voltage conditions caused by an unsuitable circuit or extension cord.
• Check the circuit protection and have internal electrical problems serviced.

Machine Slows During Grinding

Reduce the rate at which the workpiece is fed into the wheel. Excessive feed pressure can overload the motor.

Wavy Surface or Lines on the Workpiece

• Securely mount the grinder on a solid surface.
• Hold the workpiece firmly or use an appropriate holding device.
• Dress the wheel to restore an even face.
• If the wheel is too hard, use a softer wheel or reduce the feed rate.
• Remove contamination from the wheel by dressing it.

Burn Marks or Cracks on the Workpiece

• Use a wheel with a softer bond or coarser grit when appropriate.
• Reduce the feed pressure and move the workpiece continuously.
• Cool the workpiece frequently using the coolant tray.

Wheel Dulls Quickly or Sheds Grit

• Decrease the feed rate.
• Select a wheel with a harder bond if the application requires it.
• Replace a wheel that has become too small.
• Dress the wheel correctly.
• Do not use a wheel with defective bonding; replace it.

Wheel Clogs or Leaves Burn Marks

• Choose a wheel with a softer bond.
• Increase the feed rate slightly while maintaining light pressure.
• Dress the wheel to remove loaded material.
• Use coolant when the workpiece requires additional temperature control.

Warranty

The ATD-10556 / ATD-10558 Bench Grinder includes a one-year limited warranty from the original purchase date. Coverage applies to defects in materials or workmanship during normal use and may result in repair or replacement at the manufacturer’s option.

The warranty can be voided by alteration, abuse, misuse, modification, or service performed by an unauthorized technician. Normal wear items and cosmetic damage such as scratches, superficial dents, and paint abrasions are excluded. The purchase receipt should be retained for warranty verification.

Pros & Cons

Pros

• Available in compact 6-inch and higher-capacity 8-inch versions.
• Induction motors provide a durable design for regular workshop use.
• Includes coarse and medium grinding wheels.
• Adjustable standard and magnifying eye shields improve viewing flexibility.
• Metal tool rests, spark guards, mounting holes, and a coolant tray support controlled operation.
• Flexible work light improves visibility around the grinding wheels.

Cons

• The grinder must be securely mounted before operation.
• The work-light bulb is not included.
• Wheel clearance, dressing, cooling, and inspection require regular attention.
• Heavy grinding pressure can overheat the motor or damage the workpiece.
• Electrical repairs and service beyond routine maintenance require a qualified technician.