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November 11, 2019

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What to Consider When Buying a Grinding Wheel

If you’re looking to buy a grinding wheel for metalwork, there are several vendors you can find nowadays. However, to make sure you spend your money and time wisely, you must be careful when making a purchase.

Several considerations must be made before buying a grinding wheel, and the first is the material that you intend to use it on. This determines the type of abrasive you will need. If you work with steel, for instance, you should go for irconia alumina or aluminum oxide. For non-ferrous metals, non-metallics and cast iron, you should get silicon carbide.

Materials that are tough and brittle usually need a softer-grade wheel with a finer grit size. Since hard materials resist abrasion with great force, the grains tend to dull very quickly. The finer grit and softer grade formula works because the grains separate once they have dulled, and fresh, sharp cutters are exposed on the surface. Softer, more ductile materials, on the other hand, permit more penetration,so they work with a harder grade and coarser grit.

It’s also important to determine how much stock has to be removed. Due to heavier cuts and stronger penetration, coarser grits will obviously take out stock at a higher speed. But a finer grit will be more effective for softer material.

When it comes to bonds, wheels that come with vitrified bonds cut faster. If only a limited amount of stock must be removed, or if the finish requirements are higher, shellac, rubber or resin bonds are more fitting.

Another consideration that should be made is the speed of the wheel during operation. Vitrified wheels often run under 6,500 surface feet per minute. Higher speeds may cause the vitrified bond to break. Best for speeds of 6,500 and 9,500 surface feet per minute are organic bond wheels. When higher speeds are required, specially designed wheels are often necessary.

In any case, operating speed should not be higher than the maximum recommended in the manual.

Next, check the area of grinding contact between the wheel and the material to be ground. A wider area of contact calls for a softer grade and a with coarser grit. Because of the greater unit pressure, finer grits should be used for smaller areas of grinding contact.

Next thing to check is grinding action severity. This pressure is what keeps the grinding wheel and the workpiece close together. Certain abrasives are designed for severe grinding conditions, such as when grinding steel and steel alloys.

Lastly, grinding machine horsepower needs to be factored into your choice of a grinding wheel. Harder grade wheels must generally be used on machines that have higher horsepower.In cases where horsepower is less than wheel diameter, experts recommend a wheel of a softer grade. The reverse is also true.
The opposite is true as well.

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