They do not remove metal by abrasion, but instead take miniscule cuts, yielding tiny chips, or swarf. ![]() Grinding wheels can be looked upon as milling cutters. While aluminum oxide is much softer, it does not dissolve into steel in the same manner, thus it displays a much longer cutting ability. Steel has the ability to dissolve silicon at high temperatures, so the net effect is for the grinding wheel to dull immediately. Even cast iron should be ground with silicon carbide. Harold, what are the black and shiny wheels used for? Other silicon carbide wheels are generally black and shiny. With the lower cost of diamond wheels now, the green wheels make no sense, especially when you factor in the poor end result.īy the way, the color of the wheels is to identify them. I do not endorse the green wheel system, although it is used extensively, even in some industrial applications. Often one has to do something that is difficult with the diamond, but the results never rival the use of diamond because of the slower grinding rate and the chipping. I almost refuse to use one, although I have on in addition to my wet diamond grinder. Silicosis is a real threat from breathing the dust from the rapid degeneration of the wheel. ![]() They tend to chip carbide excessively, and create a serious health issue. While these wheels work, they are a poor choice. The soft bond of the wheels permits the dull grains to shed quickly, presenting (hopefully) sharp grains to the tungsten carbide in order to keep grinding it. Because tungsten carbide is so hard, silicon carbide, nowhere nearly as hard as diamond, although very hard, dulls quickly. It is a very soft (friable) silicon carbide grinding wheel formulated for grinding tungsten carbide.
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