CHATTER


Chatter is a common problem in today's machining and grinding that has become more imporant with increases in precision and decrease tolerances. Even though chatter is simply manifestation of vibration within a grinding system, finding causes and developing corrective strategies can be difficult. Essentially there are two types of chatter-causing vibration: forced and self excited (regenerative). The former is vibration independent of the grinding wheel and workpiece with sources that range from spindle bearings to machine tools operating nearby. Regenerative vibration, a type of chatter first described by Robert Hahn, starts as a slip-slide interaction between wheel and workpiece. A more recent paper presented by Inasaki at a CIRP meeting provides a fuller explanation of the many facets of chatter and suppression technology. Vibrations, however small, can be amplified by resonance within structure of the machine tool.
AES has a compilation of materials drawn from its library containing the knowledge base about chatter. Ask for a copy of the table of contents
See our discussion of chatter

GRINDING CARBIDES


Carbides are a basic building block of machine cutting tools and present a range of problems for those who need to shape, finish or repair tools. There are many choices among ways to grind carbides partially because there are different kinds of carbide. In today's industry, one finds a mix of techniques using grinding wheels made with silicon carbide and diamond. Historically, silicon carbide, specifically green silicon carbide, was the first abrasive employed to grind tungsten carbide and it held that position until the advent of synthetic diamond. Some silicon carbide wheels are still used today. As with other hard metals grinding carbide is not a simple process of selecting the proper feed and speed but must consider all of the system parameters. A CD compiling literature on grinding carbides that is the knowledge base of grinding carbides. Ask for a table of contents for our CD of over fifty papers and research reports on grinding carbides.
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rev 11/23/16