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Catalogs, manuals and any other literature that is available on this site is made available for a historical record only. Please remember that safety standards have changed over the years and information in old manuals as well as the old machines themselves may not meet modern standards. Brown & Sharpe is a division of Hexagon AB, a Swedish multinational corporation focused mainly on metrological tools and technology. During the 19th and 20th centuries, Brown & Sharpe was one of the best-known and most influential machine tool builders and was a leading manufacturer of instruments for machinists (such as micrometers and indicators). Brown & Sharpe manufactures precision measuring equipment and metrology hand tools. The company, founded in 1833, played a key role in setting industrial standards in the United States. Brown & Sharpe was acquired by Hexagon Metrology in 2001 and is headquartered in North Kingstown, RI.
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Driven from the base-mounted motor, both spindle types were arranged to run at 3200 r.p.m. (though optionally at 2750 r.p.m. if specified) but when coupled to the direct motor turned at 3450 r.p.m. (with, on this fitting, no option of a slower of faster rate).
As the table drive was all-mechanical, the mechanism employed to produce the automatic reversing left-to-right, right-to-left movements and indexing feeds was a delight to watch in action. Two rates of table travel were available, 19 and 31 feet per minute, selected by a lever behind the longitudinal-feed handwheel. To set the limits of table travel adjustable dogs, carried in a T-slot that ran the full length of the table's front face, caught against a plunger set in the forward part of the manual reversing lever - this plunger able to be withdrawn against a spring to allow, for whatever reason, table movement to go beyond the reversing point but without disturbing the dogs. Set centrally on the saddle, the manual reversing lever was a useful facility when working on very short jobs, just flicking it left and right causing the table to oscillate as required. When operated by hand, one turn of the table's longitudinal handwheel produced a travel of approximately 2' - the wheel able to be disengaged against a spring-plunger for safety reasons when power drive was engaged.
More mechanical delight was to be found in the automatic traverse movement, the limits of its travel being controlled by stop dogs mounted in a T-slot on the saddle's right-hand face. A friction-type arrangement, the automatic cross-feed mechanism could be set to index the feed in, or out, at either or both ends of the table travel - the setting being achieved by two knurled-rim nuts set in partial-circle slots on the face of the unit. Feed rates from 0.01' to 0.09' were available, a large knurled-edge nut in the middle of the assembly being used to engage and disengage the drive; with the mechanism in the latter state the cross-feed could be manually operated without fear of the drive re-engaging.
The spindle head was raised and lowered by a large-diameter handwheel connected to a pair of bevel gears - the horizontal one of which was threaded to take a non-rotating, precision-cut, heat-treated screw. Being of a considerable size, the handwheel rim was used as the micrometer dial, the widely-spaced graduations reading to 0.005'. As an option the makers offered a special fine-feed attachment that allowed the vertical adjustment to be set to just 0.0001' (1/10 of one-thousand of an inch) together with a plunger-type positive stop that could be withdrawn to allow free turning of the wheel . The