Why is a hard wheel used for grinding a soft material?

Hard materials resist the penetration of abrasive grains and cause them to dull quickly. Therefore, the combination of finer grit and softer grade lets abrasive grains break away as they become dull, exposing fresh, sharp cutting points.

Which wheel is used for grinding soft materials?

Silicon carbide is used for grinding grey iron, chilled iron, brass, soft bronze and aluminium, as well as stone, rubber and other non-ferrous materials. Grit Size – Grit size is the size of individual abrasive grains in the wheel.

Which grinding wheel is used to grind hard materials?

A fine grained grinding wheel is used to grind hard materials.

Why is a soft type wheel used on hard material and vice versa?

(steel, stainless steel, rubber, plastics, wood, carbon etc.) Theoretically this is because the softer material likes to plastically deform and put more force on the grains, whereas hardened material breaks in small chips.

What is a grinding wheel used for?

What is a grinding wheel? Grinding wheels contain abrasive grains and layers of fiberglass bonded into a wheel shape by another substance. The abrasive grains act as grinding tools, removing material from a workpiece to shape and refine it. Grinding wheels are useful in many grinding and machining operations.

Which among the following represents the soft wheel soft grade of grinding wheel?

A-H
Explanation: A-H represents soft grains in grinding wheel. 9.

Which of the following represents soft grade?

Explanation: A-H represents soft grains in grinding wheel.

Which abrasive particle would you choose for grinding high speed steel tools?

Aluminium Oxide: Aluminium oxide is tough and fracture-resistant; It is preferred for grinding of materials of higher tensile strengths like steel; high carbon and high-speed steel and tough bronze.

How is the hardness of a grinding wheel determined?

The hardness of a grinding wheel is primarily determined by the bond. When hard materials are ground with soft grinding wheels the grains break out, so that new easy-cutting grains are used again. This is known as a «self-sharpening mechanism».

Are soft grade wheels are more suitable for use on hard materials?

For this reason, finer grit sized wheels are required to grind hard materials and soft materials are best ground with medium to coarse grit size wheels. For most efficient operation, the grade must be adjusted to suit the hardness of the material.

How is hardness of grinding wheel determined?

The amount of abrasive bond in the grinding wheel determines its grade or hardness. Hardness is dependent on the grit type, the material being ground, the amount of stock removed, and a number of other factors. Hardness is rated from A-Z, with “A” being the weakest bond and “Z” being the strongest.