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Tag Archives: turning machine learning

OTHER MARKING SYSTEMS

Because superabrasive usage is proportionally larger in Europe and Japan, wheels with markings other than Standard U.S. designations may be found. One example is the FEPA (Federation of European Producers of Abrasive Products) Standards. These standards apply to a variety of

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GRINDING MACHINE COST EFFECTIVENESS

Grinding is an expensive process. It is estimated that from one quarter to half the money spent on machining in industrialized nations is spent on abrasive operations. Extensive research has been done to optimize the process to make it more cost effective with regard to removal rates and minimizing machine cycle times. Because the objective of manufacturing is to obtain …

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CUTTING MULTIPLE-LEAD THREADS

Several methods are used for indexing or dividing multiplelead threads. One method is to use an accurately slotted face plate (Figure I-410). The lathe dog is moved 180 degrees for two leads, 120 degrees for three leads, and 90 degrees for four leads. This method will work only on external threading. Another method is …

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OFFSET TAILSTOCK METHOD

Long, slight tapers may be produced on shafts and external parts between centers. Internal tapers cannot be made by this method. Power feed is used, so good finishes are obtainable. Because most lathes are equipped with taper attachments, the offset tailstock method is seldom used now. Its greatest advantage is that longer tapers can …

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BASIC INTERNAL THREAD MEASUREMENT

Because small internal threads are most often made by tap- ping, the pitch diameter and fit are determined by the tap used. However, internal threads cut with a single-point tool need to be checked. A precision thread plug gage (Figure I-342) is generally sufficient for most purposes. These gages are available in various sizes, which …

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METRIC THREAD FORMS

Several metric thread systems such as the SAE standard spark plug threads and the British Standard for spark plugs are in use today. The Système International (SI) thread form (Figure I-297), adopted in 1898, is similar to the American National Standard. The British Standard for ISO (International Organization for Standardization) …

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FACING

The material to be machined usually has been cut off in a power saw, so the piece is not square on the end or cut to the specified length. Facing from the center out (Figure I-158) produces a better finish, but it is difficult to cut on a solid face in the center. Facing …

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SETTING UP FOR FACING

Facing is done to obtain a flat surface on the end of cylindrical workpieces or on the face of parts clamped in a chuck or face plate (Figures I-143 and I-144).The work most often is held in a three- or four-jaw chuck.If the chuck is to be removed from the lathe spindle, a lathe …

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ON-SITE MACHINING

Most machining operations are performed at a permanent location such as in a machine shop. Some heavy machinery such as that used in earth moving or logging operations cannot readily be moved from locations that are often remote. Also, disassembly and shipping costs along with the downtime can often be bypassed by using portable machine tools. Portable boring bars can perform …

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