Abrasive Wheels Training Certificate Abrasive Wheel Types and Selection

Question 1

Which type of abrasive wheel is most commonly used for cutting ferrous metals such as mild steel?

Accepted Answer

Aluminium oxide wheel

Answer

Aluminium oxide wheels are the standard choice for grinding and cutting ferrous metals like mild steel, cast iron, and wrought iron. Silicon carbide is used for non-ferrous metals and stone.

Question 2

What does the letter 'A' represent in the standard abrasive wheel marking system (e.g., WA 60 K 5 V)?

Accepted Answer

The abrasive grain type

Answer

In the standard marking system, the first letter(s) indicate the abrasive type. 'A' stands for aluminium oxide and 'C' for silicon carbide. The sequence is: Abrasive type – Grain size – Grade – Structure – Bond type.

Question 3

Which abrasive wheel type would be most appropriate for cutting concrete and masonry?

Accepted Answer

Diamond-impregnated cutting wheel

Answer

Diamond-impregnated cutting wheels are the preferred choice for cutting concrete, masonry, and stone. They provide superior performance and longevity compared to silicon carbide on these hard, non-metallic materials.

Question 4

A grinding wheel marked with a grain size of '60' would be classified as which type?

Accepted Answer

Medium

Answer

Grain sizes are classified as: Coarse (8-24), Medium (30-60), Fine (70-180), and Very Fine (220-600). A grain size of 60 falls at the upper end of the medium range.

Question 5

What is the primary purpose of a flap disc when used on an angle grinder?

Accepted Answer

Blending, finishing, and deburring metal surfaces

Answer

Flap discs consist of overlapping abrasive flaps bonded to a backing plate. They are designed for blending welds, finishing surfaces, and removing burrs. They provide a smoother finish than standard grinding discs.

Abrasive Wheels Practice Test

Abrasive Wheels Practice Test

Abrasive Wheels Training Certificate Abrasive Wheel Types and Selection