American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 263
l not spread 234 GRINDING AND LAPPING to any extent, and it is possible with a lap charged in this mannerto avoid cutting the ends of the hole at all. The work should alwaysbe kept in motion back and forth to avoid lumping of the emeryand cuttings which will score grooves in the work. Ring Gage and… … Fig. 3. — A Lap for Plugs placing them in a pail of benzine for a long enough time to bringthem down to the temperature of the room. Some shops leave athin collar projection from each side around the hole, so that, if thereis any bell-mouthing, it will be in these collars, which are groundoff after…
Machine-shop practice
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