Abrasive Wheel Types and Selection Flashcards
6 cards from real Abrasive Wheels Training Certificate practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Abrasive Wheel Types and Selection flashcards as text
Which type of abrasive wheel is most commonly used for cutting ferrous metals such as mild steel?
Answer: Aluminium oxide wheel
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.
What does the letter 'A' represent in the standard abrasive wheel marking system (e.g., WA 60 K 5 V)?
Answer: The abrasive grain type
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.
Which abrasive wheel type would be most appropriate for cutting concrete and masonry?
Answer: Diamond-impregnated cutting wheel
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.
A grinding wheel marked with a grain size of '60' would be classified as which type?
Answer: Medium
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.
What is the primary purpose of a flap disc when used on an angle grinder?
Answer: Blending, finishing, and deburring metal surfaces
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.
In the abrasive wheel marking 'WA 46 L 7 V', what does the letter 'V' indicate?
Answer: The vitrified bond type
The last letter in the standard marking indicates the bond type. 'V' represents vitrified bond (ceramic), which is the most common bond type. Other codes include B (resinoid), R (rubber), and M (metal).