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Figure 8.52, Manufacturing
Processes for� Engineering
Materials� 2nd Ed,
Kalpakjian, p. 541
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Recall the key
terms from the last slide.
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Bed:� Supports all other machine parts
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Carriage: Slides
along the machine ways
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Head stock:
Power train of system (spindle included)
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Tail Stock:
Fixes piece at end opposite to the head stock
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Swing: Maximum
diameter of the machinable piece.
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Often
differentiate between the swing over bedways (facing) and the swing over
cross slide (turning)
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over cross
slide- duh cross slide is under part as one is turning- thus smaller
diameters-
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over bedways -
if facing at end of part you DO not have to move the slide under the part--
thus you have more room and bigger swing.
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Lead screw
(& feed change gear box) allows you to control the feed per revolution
with a great deal of precision.� This
is vital when cutting screw threads, as it lets you precisely control the
pitch of the thread.
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The EMCO lathes
here in the RDPL (& CNC machines in general) are set up a little
differently in that the feed rates are DETACHED from the spindle speed.
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On MANUAL
machines require some mechanical linkage between spindle speed and feed
rate--� ON CNC machines computer can
precisely control thus no mechanical linkage
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