American Machinists' Handbook and Dictionary of Shop Terms; A Reference Book of Machine Shop and Drawing Room Data, Methods and Definitions (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...diameter, inc 0.0015 to 0.002 Large To 6-inch diameter, inc 0.002 to 0.003 Large SHRINKING FITS--FOR PIECES TO TAKE SHELLS, ETC., HAVING A THICKNESS OF MORE THAN f INCH To i-inch diameter, inc 0.0005 to o.ooi Large To i-inch diameter, inc o.ooi to 0.0025 Large To 2-inch diameter, inc 0.0025 to 0.0035 Large To 3-inch diameter, inc 0.0035 to 0.005 Large To 6-inch diameter, inc 0.005 to 0.007 Large GRINDING LIMITS FOR HOLES To J-inch diameter, inc Standard to 0.0005 Large To i-inch diameter, inc Standard to 0.00075 Large To 2-inch diameter, inc Standard to o.ooi Large To 35-inch diameter, inc Standard to 0.0015 Large To 6-inch diameter, inc Standard to 0.002 Large To 12-inch diameter, inc Standard to 0.0025 Large Metric Allowances For Fits of All Classes Table 6 covers allowances worked out by the Newall Engineering Company for use in connection with metric measurements; the allowances being given in decimals of a millimeter. The Newall system is based on a hole "basis," which means that all holes are produced as near the standard size as commercially possible and the allowances are made in the shaft or other fitting. The first part of the table shows the tolerances allowable in a standard hole for two grades of work which are designated by classes A and B. The remainder of the table covers fits of various classes. Table 6--The Newaix Standard Tables of Allowances for Various Classes of Fits in Millimeters Tolerances in Standard Holes for Two Grades of Work Press Fits For Wheel Hubs The practice of the Boston Elevated Railroad is to allow 8 tons per inch of diameter. An excess of 2 tons total pressure is allowed for cast iron, while the minimum pressure may be from 8 to 13 tons below the normal according to diameter, as shown by the following table. ...