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Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation.
South Bend Lathe is a brand of machine tools.Today's South Bend Lathe corporation is the successor to the original South Bend Lathe Works, an American machine tool builder that for many decades was one of the most important builders [citation needed] of metalworking lathes in the U.S. and in the world.
Threaded spindle noses are still built on new machine tools, but only of the low-end variety (hobbyist, least-expense MRO, etc.). High-capital manufacturing (where high upfront expense yields lowest possible unit expense for mid- to high-volume part counts of high-precision parts) has moved away from this type of mounting.
HSK's hollow shank is deliberately thin and flexible, so it expands more than the spindle and tightens when rotating at high speed. Furthermore, the HSK holder is dual contact: It engages with the spindle on both the taper and the top of the flange which resists axial movement when thermal growth and/or centrifugal force of the spindle occurs.
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A machine tool may have several spindles, such as the headstock and tailstock spindles on a bench lathe. The main spindle is usually the biggest one. References to "the spindle" without further qualification imply the main spindle. Some machine tools that specialize in high-volume mass production have a group of 4, 6, or even more main spindles.
AC spindle drive were optional with system 6 and these were reliable, unlike the earlier DC units. 8 bit paper readers or RS232C ports were used to input programs. 8 kb of bubble memory was standard, 128 kb was a $10,000 + option. System 6 level two came out in 1983 and is distinguished by 3 extra buttons on the control panel.
Started production of spindle motors for 8-inch hard disk device. 1984: February: Acquired the axial-flow fan business from American company Torin Corporation, and established the locally incorporated company Nidec Torin Corporation in America. Started production of spindle motors for 3.5-inch hard disk device. 1988: October
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