American Machinist Volume 33, PT. 1

American Machinist Volume 33, PT. 1

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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. 1910 edition. Excerpt: ...In this way, the kegs are raised intact, and the nails are uninjured except for slight rust. Discussion oftfiePrevious Question Letters from Our Readers Showing how many Men of many Minds Look upon Various Subjects Opened up in previous Numbers Cutting Coarse Pitch Threads Reading on page 204, of a triple-thread worm cut at Messrs. James Bertram & Sons, at Dundas, Ontario, Canada, reminded me of a similar pitch I cut some years ago. Instead of having three starts or leads, I cut sixty; they were a pair of rolls for a screw-rolling machine of the cylindrical type, made by Messrs. Nettlefolds, Birmingham, England, and cut on a J4-inch pitch lathe, or a lathe with a lead screw 4 threads per inch; the wheels to produce this pitch are 120 mandrel, 15 stud, 100 stud pinion into 20 leading screw; of course, it was impossible to cut the thread by driving off the spindle, so I forged a wrought-iron handle, then drilled and tapped the end of the leading screw, and bolted the handle to it, which 1 turned with the greatest ease. The rolls were about 4 1/16 inches diameter and about f inch thick. The method I generally use for calculating coarse pitches is the rule of ten teeth to cut % inch; the leading screw in this case being %-inch pitch, or 4 threads per inch, required a wheel with twenty teeth in the leading screw; as ten teeth cut Y inch, twenty teeth must cut '4 inch and in 10 inches in length I should have 80 one-eighths, which would work one eight hundred teeth; 800 divided by 8 equals 100, which would be the wheel for the stud pinion. Now I should have two more wheels, one to rotate eight times while the other rotates once, hence, 120 on the spindle into 15 on the stud; wheels required 120 spindle, 15 stud, 100 stud pinion, ..."show more

Product details

  • Paperback | 1082 pages
  • 189 x 246 x 54mm | 1,887g
  • United States
  • English
  • black & white illustrations
  • 1236769236
  • 9781236769237