http://www.paprecision.com! Cutting Speed and Feed - Its significance in Precision Machining of the metal components The term " cutting speed, " as applied to machine tools, means the cutting performed by the tool edge, in a given time. Or the material cut by the tool in a given time, would measure if extended in a straight line. The term " feed, " as applied to a machine tool, means the thickness of the cut or shaving taken by the tool. Planing machines being constructed so that their tables run at a given and unchangeable speed, their cutting speed is fixed. The operator has only, therefore , to consider the question of the amount of feed to be given to the tool at a cut. It may be placed at a maximum by keeping the tool as stout as possible in proportion to its work. This makes it as hard as its strength will allow, and fastening it. So that its cutting edge will be as close to the tool post as circumstances will permit. It is only when we treat of lathe work that the questions of feed and speed assume their real importance. Because there is no part of the turner's art in which so great a variation of practice exists or is possible. No part of his art so intricate and deceptive, and none requiring so much judgment, perception, and watchfulness. One reason being the nature of the work to be performed may render peculiar conditions of speed and feed necessary. Also a tool may appear to the unpracticed or experienced eye, to be doing excellent duty. But it is really falling far short of the duty it is capable of performing.

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For all work which is so slight as to be very liable to spring from the force of the cut, for work to execute which a tool slight within body can be used, in addition to instances in which the tool needs to take out a sweep or even round a corner which has a break in it, a light or even good feed should be employed. Therefore, the fastest cutting speed can be used. To the highest quantity work, maximum of the tool feed can be used. An adequately sharp tool when combined with fast speed as well as good feed will certainly cut off thin part extremely quickly. But which is not right. Because of the tool will never remain deep cuts at such high speeds. Plus the increase in the depth of cut as well as the feed of the tool, obtainable by work of a slower lathe speed more than compensates for that reduction of lathe speed essential to their attainment.