Angle Grinder


About this Machine

This angle grinder is a versatile handheld tool that can grind metal and cut tile, stucco and pavers, rout out mortar, plus it can sand, polish and sharpen. The different attachments allow you do perform different tasks. Know your tool before you use it!

This angle grinder is a Chicago Electric (Harbor Freight) 4.5 inch model 65519.

Machine Safety

This is for your own safety and the safety of those around you!

Be aware of flying sparks and broken discs! Always hold the grinder so that sparks fly away from you, other people, and flammable materials. The discs can shatter, ejecting themselves at high speed; this risk can be reduced if you refrain from using heavy pressure!

Improperly clamped workpieces can be grabbed by the angle grinder and ejected at high speed. Just because you are unable to jiggle the workpiece doesn’t mean the machine will be unable to.

How to Get Help

Ask a Manager if you have any questions!

Using this Machine

These sections describe the standard usage and common pitfalls.

Setup

See the diagram of the tool below, references to parts will be made to this diagram in the instructions.

Choosing your Accessory

Disks measure between 4 and 7 inches, with 4.5 inches being most people’s preference.

Installing the Auxiliary Handle:

  1. The Handle (51) can be installed in three different positions; on top, or on either side of the Gear Box (3).
  2. Screw the threaded end of the Handle into the selected position. Tighten securely before beginning work.

Adjusting the Guard:

  1. Depending on where the Handle is mounted; the Guard may have to be moved. Adjust the Guard (15) to the proper position for the intended operation before installing a grinding wheel or other disc.
  2. Loosen the screws in the collar of the Guard and rotate to the position desired.

Installing a Grinding Wheel:

  1. Before installing a grinding wheel, review Machine Safety.
  2. Verify that the Grinding Wheel meets the following:
    • Rated to at least 10,000 RPM
    • No larger than 4 ½ inch in diameter
    • Titted with a 7/8 inch round arbor hole
    • ¼ inch thick or less
    • A type of grinding wheel suitable for surface grinding, not edge grinding
    • Clean and dry
    • Undamaged
  3. Press in and hold the Spindle Lock (1) to prevent the Spindle (17) from turning.
  4. Remove the Outer Flange (20). Keep the Inner Flange (18) in position on the Spindle.
  5. Slip the Grinding Wheel onto the Spindle with a paper gasket, or blotter, first. The blotter should be centered on the grinding wheel and the wheel and blotter should rest flat against the Inner Flange. NOTE: The blotters help prevent grinding wheel damage and wheel slippage. Use these to prevent serious injury.
  6. Thread the Outer Flange Arbor Nut onto the Spindle. Wrench tighten only enough so that the wheel is securely held on the spindle. Do Not Overtighten.

Installing a Threaded Accessory:

  1. Before installing please review the Machine Safety section. The accessory must meet the following:
    • rated to at least 10,000 RPM
    • no larger than 4 ½ inch in diameter
    • fitted with a 7/8 inch round arbor hole
    • ¼ inch thick or less
    • a type of grinding wheel suitable for surface grinding, not edge grinding
    • clean and dry
    • undamaged
  2. Press in and hold the Spindle Lock Button to prevent the Spindle from turning.
  3. Remove the Outer Flange and Inner Flange and keep in a safe place.
  4. Thread disc accessory firmly onto the Spindle. Wrench tighten onto the Spindle.

Operation

Choose a disc that is the best fit for your project. There are sanding disks, abrasive grinding disks (to cut steel), polishing pads, wire brush wheels (used to remove excess material like rust or paint) and diamond blade cut off disks (used to cut hard surfaces such as tile). Disks measure between 4 and 7 inches, with 4.5 inches being most people’s preference.

When you are ready to begin follow these steps:

  1. Verify that you have secured the piece you are working on into place (clamps work well).
  2. Power on the angle grinder by pulling on the Safety Switch (41) back, then squeeze the Paddle Trigger (43).
  3. The disk must be spinning before you apply it to your working surface. Be sure you allow the angle grinder to reach operating speed before using it.
  4. Apply the wheel to the work piece and increase the load gradually.
    • NOTE: Your grasp should be firm so that you have full control of the direction in which the angle grinder is moving.
    • NOTE: If the tool bogs down, use lighter pressure.
    • NOTE: To create a smoother surface, keep the tool moving over the work surface.
  5. Release the Paddle Trigger to stop the tool.
  6. Allow the tool to come to a complete stop before setting it down.

Remember, do not leave the angle grinder running and only use the grinder when it is in your hands.

When you are done, gently lift the angle grinder, shut off the power, and set the angle grinder down in a safe place. Do not touch your work piece immediately after grinding operation as it may be extremely hot.

Shutdown

Turn off and unplug the angle grinder and make sure the disk is still in good condition after usage. Remember to not touch the work piece immediately after grinding operation as it may be extremely hot.

Cleanup

Tips and Tricks

Ring-Test

A ring-test will verify that a disc is undamaged. Perform this test on the wheel (unless wheel is smaller than 4 inches or is an unusual shape) as follows:

  1. Suspend wheel using a pin or finger through the arbor hole.
  2. Tap the flat side of the wheel with a light non-metallic object.

Troubleshooting

Problem Possible Causes Likely Solutions
Tool will not start 1. No power at outlet.
2. Cord not connected.
3. Carbon Brushes may be worn or damaged.
1. Check power at outlet.
2. Check that cord is plugged in.
3. Have Carbon Brushes replaced by a Manager.
Tool operates slowly or erratically. 1. Carbon Brushes may be worn or damanges.
2. Excess pressure applied to workpiece.
1. Have the Carbon Brushes replaced by a Manager.
2. Decrease pressure, allow the tool to do the work.
Tool does not grind, sand, or brush effectively. 1. Disc accessory may be loose on Spindle. Check tightness of Outer Flange Arbor Nut or treaded disc accessory on Spindle.
2. Disc accessory may be damanged, worn, or wrong type for the material.
1. Be sure disc accessory is of correct dimension and Outer Flange Arbor Nut is tight.
2. Check the condition and type of disc accessory. Use only a proper type of disc accessory which is in good condition.

Maintenance (Managers Only)