Common Problems and Faults

Identifying Faults and Problems with Abrasive Wheel Equipment

Recognising faults at an early stage is essential for preventing accidents and protecting both operators and equipment. Abrasive wheel problems often give warning signs, and ignoring these can quickly lead to serious failures or injury.

Excessive Vibration

One of the most common warning signs is excessive vibration. A grinder or bench wheel that vibrates more than normal usually indicates a fault.

Common causes include:

• Incorrectly mounted wheels
• Damaged or cracked wheels
• Worn bearings
• Uneven wheel wear

If abnormal vibration is felt, stop the machine immediately and investigate. Never ignore vibration, as it can rapidly lead to wheel failure.

Wobbling or Wheels Running Out of True

A wheel that wobbles or does not run true is unsafe. This is often caused by:

• Incorrect fitting
• Damaged or incorrect flanges
• Worn or cracked bore holes

Even slight wobble increases stress on the wheel and can cause it to break apart during use. Such wheels must not be used.

Unusual Noises

Abrasive wheels should produce a consistent, even sound when running. Any unusual noises, such as scraping, rattling, ticking, or sudden changes in sound, are warning signs.

If this occurs, switch off the machine and allow it to stop completely. Unusual noises often indicate loose components, damage, or misalignment.

Uneven Wheel Wear

Uneven wear is another common fault and may result from:

• Poor operating technique
• Incorrect pressure
• Misalignment
• Using the wrong wheel for the task

Uneven wear weakens the wheel and increases the risk of cracking or wheel burst.

Glazing of Grinding Wheels

Glazing occurs when the surface of a grinding wheel becomes smooth and shiny, preventing effective cutting.

This can be caused by:

• A wheel that is too hard for the material
• Excessive pressure
• Material build-up on the wheel surface

A glazed wheel must be dressed or replaced before further use.

Clogging or Loading

Clogging or loading happens when material builds up on the wheel surface. This reduces cutting efficiency and can lead to overheating.

Using the correct wheel for the material and allowing the wheel to cool between passes helps prevent this problem.

Overheating

If a wheel becomes excessively hot, it may be due to:

• Too much pressure
• Using the wrong part of the wheel
• Restricted airflow from blocked guards or dust build-up

Overheating weakens the wheel bond and can quickly lead to failure.

Damaged or Missing Guards

Guards are critical safety devices. A cracked, loose, or missing guard cannot provide proper protection.

Never use abrasive wheel equipment with damaged or removed guards. Faulty guards must be repaired or replaced before use.

Wheel Damage

Cracks, chips, or broken edges on a wheel are serious faults. Even a small crack can make a wheel unsafe.

Any damaged wheel must be taken out of service immediately.

Electrical Faults

Powered abrasive wheel tools may also develop electrical faults, including:

• Damaged cables
• Loose or faulty switches
• Overheating motors

Electrical faults can cause electric shock or sudden power loss. All electrical issues must be reported and repaired by a competent person.