Abrasive Wheels Training Certificate Abrasive Wheel Types and Selection 2

Question 1

Which grade of abrasive wheel should be selected for grinding hardened steel?

Accepted Answer

A soft grade wheel (A-H)

Answer

A hard grade wheel (R-Z)

Answer

A medium grade wheel (I-P)

Answer

Grade does not affect performance on hardened steel

Question 2

What is a Type 27 abrasive wheel commonly known as in the workplace?

Accepted Answer

A depressed centre grinding disc

Answer

A straight wheel

Answer

A cup wheel

Answer

A cylinder wheel

Question 3

What is the main difference between an organic bond and a vitrified bond in abrasive wheels?

Accepted Answer

Organic bonds (resinoid/rubber) are more flexible and shock-resistant than vitrified bonds

Answer

Organic bonds are only used on diamond wheels

Answer

Vitrified bonds are more flexible and shock-resistant

Answer

There is no practical difference between the two

Question 4

When selecting an abrasive wheel for use on an angle grinder, which specification must always match?

Accepted Answer

The bore size must match the grinder spindle diameter

Answer

The wheel colour must match the grinder brand

Answer

The abrasive type must be aluminium oxide

Answer

The grain size must be 60 or above

Question 5

What does an 'open' structure number (7-14) in an abrasive wheel marking indicate?

Accepted Answer

The wheel has fewer abrasive grains with more spacing between them

Answer

The wheel is designed for wet grinding only

Answer

The wheel has a very dense concentration of abrasive grains

Answer

The wheel is only suitable for bench grinders

Question 6

Which type of abrasive wheel is specifically designed for use in cutting-off operations and is typically very thin?

Accepted Answer

Type 1 (flat/straight) cutting disc

Answer

Type 6 (cup) wheel

Answer

Type 11 (flaring cup) wheel

Answer

Type 5 (recessed one side) wheel