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Traverse-spindle Grinding Attachment, so called because the spindle (being held in the hand) was free to slide in its bearings. An overhead pulley drove the spindle and the rope drive, twisted in this case to reverse its direction of rotation, can be seen wrapped round a pulley in the middle of the shaft. In the illustration above a small hole is being finished in the end of a hardened rod with a diamond lap - the spindle being run at between 10,000 and 12,000 rpm.
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