Management of Small Engineering Workshops

Management of Small Engineering Workshops

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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. 1903 edition. Excerpt: ...connection: --The following figure gives the same results continuously, instead of by steps: --Example.---If a cut 45 in. in diameter is being taken in a lathe, and one revolution occupies 35 seconds, the cutting speed is nearly 250 in. per minute. This is found by following the vertical line marked 45 in. to a point where it cute the horizontal marked 35 seconds. The point nearly lies on the line marked 250. The figure on page 130 gives the speed corresponding to various lengths of cutting stroke made in various times. For instance, if a planing machine, taking a cut of 67 in., occupies 20 seconds in making the cutting stroke, the cutting speed is a'bout 200 in. per minute. This is found by following the vertical line, representing 67 in., to the point where it meets the horizontal line, representing 20 seconds. This point will be seen to lie on the line marked 200, showing the cutting speed. Width and Depth of Cut.--These are only limited by the strength and stiffness of the machine and the work. The proper depth and width of any cut is the greatest which a machine will stand. Lathes.--'For heavy work, say above 5 in. or 6 in. in diameter, a width of as much as in. can sometimes be taken off per revolution, though under ordinaiy circumstances better results are obtained with in. Finishing cuts should be as light as possible with a flat pointed tool, and as broad a feed as the machine will give. The feeds allowed for in man)', if not most machines, are much too small. Except for small work under 1 in. in diameter, or very fine work, nothing less than '/is in. per cut need be used, and as deep as the machine will take. For ordinary work, on which a very accurate finish is not required, no more than one roughing cut and one finishing cut...
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Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 123689619X
  • 9781236896193