![]() It is sometimes called the entering angle. As standard equipment for this lathe, it includes a sturdy 7-1/4-inch 4-jaw chuck, which is strong enough to get a firm grip on the materials. This is the angle between the projection of the side cutting edge on the basic plane and the direction of feed. For the speed range, it is capable of working at 6 spindle speeds, from 130 to a maximum capacity of 2000 rotations per minute. In cutting tool terminology used in the U.S.S.R., there is another angle called plan approach angle this is the complementary angle to the side cutting edge angle used in cutting tool terminology in India, Great Britain and the U.S.A. Thus a tool with shaped specified as 8-14-6-6-6-15-4 has 8° back rake, 14° side rack, 6° end or side relief, 6° end cutting edge and 15°side cutting edge angles, and 4mm nose radius. The seven elements that comprise the signature of a single-point cutting tool are always started in the following order: This numerical method of identification has been standardized by the American Standards Association. The signature is a sequence of numbers listing the various angles, in degrees, and the size of the nose radius.
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