cutting tool

The same jagged crest on the Paleolithic chopper that developed into the ax also developed into another broad tool category, the knife, which combined a uniquely shaped sharp blade with a

Metal-cutting tools are classified as single point or multiple point. A single-point cutting tool can be used for increasing the size of holes, or boring. Turning and boring are performed on lathes and boring mills. Multiple-point cutting tools have two or more cutting edges…

…“bond,” it is a self-sharpening cutting tool. As the grains on the periphery become dull, they are shed from the surface of the grinding wheel, and fresh, sharp cutting edges are exposed. The ability to resharpen is controlled by the nature of the bond used and the ratio of abrasive…

…layers can be used in cutting tools, windows for optical devices, or substrates for semiconductors.

…or beam presses; automatic computerized cutting systems with straight blades; and automated computerized laser-beam cutting machines.

This first powered cutting tool was soon improved by introduction of compressed air as a power source in place of steam. Later, electricity was used. The longwall cutter was introduced in 1891. Originally driven by compressed air and later electrified, it could begin at one end of a…

…glass and so have made cutting one of the most popularly practiced techniques of embellishing glassware. The cutting process involves roughing out a marked pattern on an article of glass with a revolving steel wheel that is kept coated with fine wet sand or an artificial abrasive. The wheel’s edge,…

…devices were not economical, because cutter life was short, and frequent cutter replacement was costly. This was likely to change, however, as mole manufacturers sought to extend the range of application. Improvement in cutters and progress in reducing the time lost from equipment breakages were producing consistent improvements.

For rock excavation, improved cutters are generally considered the key for expanding economic ability of moles to include harder rock. Much effort is being devoted to improving current mechanical cutters, including technical advances based upon space metallurgy, geometry of cutter shape and arrangement, mechanics of cutting action, and research…