Abrasive Wheel

Abrasive Wheels

Abrasive Wheel Characteristics
An abrasive wheel is defined as :A wheel consisting of bonded abrasive particles with which there is a recognised risk of bursting
A coated abrasive disc
A wheel made of wood or metal with a surface of abrasive material. Abrasive Wheels

Resinoid (Resin based abrasive)
Teflon reinforced.

Type 27
Reinforced Depressed centre grinding wheel

Type 41
Reinforced flat cut of wheel.

Type 42
Reinforced Depressed centre cut off wheel

Characteristics
The maximum permissible speed in revolutions per minute (r/min) specified by manufacturers must be marked on every abrasive wheel larger than 55mm in diameter

The marking system shows all characteristics & composition of the abrasive wheel

A 36 P B F
Type of Grit
A = Aluminium Oxide
For High Tensile Materials
C = Silicon Carbide
For Soft Materials

Grit Size

Hardness

High Number
Fine Grit

The Higher the Letter the Harder the Wheel

Low Number
Coarse Grit

B = Bakelite
Bond
(Resin Bond)

F = Fibre
Reinforced

Examination of the Wheel
Information i.e. maximum permissible speed, composition of wheel must be stated.
Look for signs of contamination & damage before use.
Ensure the correct type of wheel is used, don’t use grinding for cutting or cutting for grinding. Ensure metal discs are used for metal
& stone for stone
A warped wheel may cause excessive vibration, side pressure, or heating and possible wheel breakage.

Check before use
• Check wheel for damage
• Check wheel for contamination
• Check wheel speed and type
• Check specification (suitability)
• Check Expiry Date (Centre Ring)

What causes Abrasive wheels to burst?
•Over-speeding
•Wrong wheel type
•Impact to wheel
•Used in unbalanced position
•Trapped wheels
•Work materials moving
•Incorrect flanges
•Non-reinforced wheels.

Storage, Handling & Inspection

• Keep dry
• Flat in original packing or use of pegs
• Keep off machine
• Visual check
• Flatness
• Check for evidence of liquid exposure