Grizzly H437 instruction manual Wheel Inspection, To perform a Ring Test

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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 newÑoften, 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

Type-1

60 Grit

Aluminum

Grade L

Oxide

Vitrified Bond

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 ÒpingÓ 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!

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H4378/H4379 Slimline Bench Grinder

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Contents Slimline Bench Grinder Model H4378/H4379Page Table Of Contents Safety Safety Instructions For Power ToolsLength AMP Rating Additional Safety Instructions For Grinders Always Wear EYE ProtectionExtension Cords Circuit Requirements110V Operation GroundingIntroduction CommentaryPiece Inventory AssemblyUnpacking Mounting Tool Rests Eye ShieldsOperations Test RunHere are some tips to help you avoid breaking the wheel Safe Grinding Wheel CareHere are some tips to keep in mind while grinding Wheel Selection Prefix Abrasive Grit Grade BondWheel Inspection To perform a Ring TestDisconnect the grinder from the power supply Wheel MountingLubrication MaintenanceGeneral Grinding WheelsDate Approximate Hours Of Use Maintenance Performed Closure Troubleshooting Symptom Possible Cause Corrective ActionMotor Overall DimensionsFeatures Model H4379 Slimline Bench Grinder 2827 Model H4378 Parts Warranty and Returns Warranty Card Grizzly INDUSTRIAL, INC BOX BELLINGHAM, WA