Chatter A phenomena that produces periodic marks on the workpiece and sometimes associated with audible sounds during grinding. Caused by vibrations that originate with the rotating grinding wheel, spindles, slides or other components of the machine tools.
In 1919 a group of tool and die makers in Highland Park, Michigan—all of them former employees of Ford Motor Co.—established Ex-Cell-O Tool & Manufacturing Co. Over the next few years they found a niche in making parts and fixtures for aircraft, although they also made grinding machines and air-driven grinding spindles.
don't listen to sprinkler buddy, he clearly doesn't know the stump grinding market, and hasn't done much stump grinding. depending on the area you live in, if its middle to upper class there could be a good market for it. personally I wouldn't buy a small machine like that, unless you have used one before and know how slow they are.
Threading is the process of creating a screw thread.More screw threads are produced each year than any other machine element. There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and grinding, as detailed below); deformative or transformative methods (rolling and forming; molding and casting ...