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  • Description: tolerances
(2 results)



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    • Betts Vertical Boring Mill at Cleveland Tank Plant

    • Cleveland Tank Plant; World War II; General Motors Corp.; Korean War; Defense industry; Drilling & boring machinery
    • "August 1, 1951 -- A 24 foot Betts Vertical Boring Mill is shown as it machines an 84-inch diameter surface for mounting the tank's 20 ton turret ring and race assembly. Tolerances down to thousandths of an inch can be held on this large surface,...
    • American Ship Building, Lorain, Ohio

    • Lorain (Ohio); Ships; Shipping; Boat & ship industry
    • "This 96,000-pound stern frame for one of Pittsburgh Steamship Company's new ore carriers has to fit like paper on a wall. Worker in foreground lines up his sights to insure placement of the giant one-piece unit to tolerances of one-sixteenth of an...

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