“Understanding of proper grinding wheel selection makes it easy for you to do the job faster and more effective.”
The grinding wheel is an abrasive cutting tool responsible for the removal of excess unnecessary parts of the workpiece and for optimum surface finishing. There are a lot of factors to consider once you select wheels to be used in the operation:
Materials to be ground
• The first thing to consider here is the material to be ground for it will determine what abrasives to be used. The hardness and softness of the material may greatly affect to the function of the grinding wheel and so proper matching is highly recommended.
Grinding steels and alloys for example, should require aluminum oxide abrasives. Generally, hard metals can resist the penetration of the wheel grains which cause them to get dull quickly. These metals should require wheels that have the combination of fine grit size and softer grade to expose fresh, sharp cutting points. On the other hand, soft and ductile metals that are easily penetrated should use wheels with coarse grit and hard grade.
Amount of stock
• Another consideration is the amount of stock subject for removal. Coarser grits are more capable of rapidly removing stock since they can do better penetration and heavier cuts.
For materials that are hard to penetrate, the use of finer grits will make the work fast since they have more cutting points to cut away the unnecessary parts.
- The wheel speed determines what type of wheel bond to be used in the abrasive machining process. There are organic types of bonds for conventional grinding wheels. Organic rubber bonds are used for smooth grinding while vitrified bonds work best in fast cutting. However, these vitrified bonds may break at high speed and pressure. Their strength is designated in the grade of the wheel.
Area of grinding contact
- The contact between the wheels and the workpiece is highly crucial to the outside diametrical surface of the material. For different areas, there also are different types of grades to be used to ensure optimum part cutting. Broad area of contact indicates the use of wheels with coarser grits and soft grades. This helps to keep a cool cutting action even under heavier loads that are imposed by the size of the workpiece.
Severity of grinding action
- Severe conditions during the grinding course may affect the outcome of ground workpiece. Some abrasives are intently designed for high pressure environments. Make sure to pick the right wheels that fit their designated machining temperature.
Grinding machine horsepower
- The machine horsepower will determine what grade will be applied on the operation. Generally, wheels with higher grades should be used on machines that have higher horsepower. If the horsepower is greater than the wheel diameter, choose wheel with harder grade. If it’s less than the wheel diameter, wheel with a softer grade should be used.
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