Minutes of Proceedings of the Institution of Civil Engineers Volume 52

Minutes of Proceedings of the Institution of Civil Engineers Volume 52

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ...smooth surface in the interior of the hole, and, when dull, merely require to be ground, and do not need to be re-drawn or tempered, as they are of the same diameter and temper throughout. These drills are made principally by the Morse Twist Drill Company, of New Bedford, Mass., from steel wire, No. 20 wire gauge, up to a size that weighed with the holder 80 lbs. An example of a twist drill is shown in Fig. 10. Traversing or slot drilling machines are now generally used for cutting slots, grooves, keyways, cotter holes, &c. The principle upon which these machines operate is the combination of a lateral movement with the rotary motion of the drill. There are several forms of machine in use in this country, but in most of them the drill spindle revolves in a headstock sliding on a bed, like that of a shaping machine, and is reciprocated by a crank disk driven through elliptical wheels, in order to obtain an equal traversing speed. The downward feed motion for the drill spindle is worked by a cam that comes into action at the end of the traverse. In Shanks' duplex slot drilling machines two horizontal drills operate simultaneously upon opposite sides of the work, and as they only require to be the length of half the depth of the slot, they are proportionately stiffer. The drills used for slot drilling have the neutral part at the centre removed, and are fork-shaped, with the opposite cutting edges in the same plane. Boring is an operation which, within certain limits, may be efiiciently performed in the lathe by fixing the work in a chuck, and holding the tool in the slide rest; or by using a boring bar and supporting the work upon a table placed on the carriage. Vertical drilling.machines may be also used for boring purposes if...show more

Product details

  • Paperback | 170 pages
  • 189 x 246 x 9mm | 313g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236811623
  • 9781236811622