How to Choose a Grinding Wheel
If you’re looking to buy a grinding wheel for metalwork, there are several vendors you can find nowadays. However, it is crucial to buy the right one to avoid wasting money and time.
There are different things to look into when shopping for a grinding wheel, and the first is what you plan to use it on. This will dictate what abrasive is necessary for the wheel. For example, for steel alloys, zirconia alumina is a good choice. If you’ll be grinding cast iron, non-ferrous metals and non-metallic materials, your best choice is a silicon carbide abrasive.
If you’re dealing with tough and brittle materials, a wheel with soft grade and a fine grit size is most suitable. That’s because harder materials resist abrasive grains, which makes them dull fast. The fine-grit-soft-grade combo allows the grains to come off as they dull, revealing newer and sharper cutters. Softer, more ductile materials, on the other hand, permit more penetration,so they work with a harder grade and coarser grit.
The amount of stock that should be removed is also a factor. Due to heavier cuts and stronger penetration, coarser grits will obviously take out stock at a higher speed. In the same manner, softer materials are right for finer grits.
As to bonds, wheels with vitrified bonds, they are capable of higher-speed cutting. For removing tiny amounts of stock, shellac, resin or rubber bonds are advised.
Another thing that makes a difference when choosing a wheel bond is how fast the wheel turns in operation. Vitrified wheels are typically operated at a maximum speed of 6,500 surface feet per minute. Higher speeds may cause the vitrified bond to break. Organic bond wheels are the common choice from speeds of 6,500 to 9,500 surface feet per minute. When higher speeds are required, specially designed wheels are often necessary.
In any case, maximum operating speed limits indicated on the wheel or its blotter must not be exceeded.
The next issue to look into is the area of the grinding contact between wheel and the material being ground. A wider area of contact calls for a softer grade and a with coarser grit. Finer grits and harder grades are a must for smaller areas of grinding contact because of the greater unit pressure. Visit here for more information: www.actionsuper.com about Grinding Wheel.
Next thing to check is grinding action severity. This is the pressure responsible for keeping the grinding wheel close to the workpiece. There are abrasives made to endure extreme grinding conditions when working on steel and steel alloys.
Finally, grinding machine horsepower should be considered. Higher-horsepower machines often work with harder-grade wheels.In cases where horsepower is less than wheel diameter, experts recommend a wheel of a softer grade. The reverse applies too.