. Bulletin - United States National Museum. Science. Figure 20.—A hob-grinding machine patented in 1932 and incorporating the master-screw principle. Carl G. Olson's patent 1874592. new but had hitherto been solved by increasing the size of the parts, an avenue of limited utility to de- signers in these fields where total weight as well as the effects of mass and inertia are so important. By making these parts of heat-treated steel, the strength could be made suitable while the size and mass of the parts were kept within bounds. The necessary proc- esses of heat-treating were not always a
. Bulletin - United States National Museum. Science. Figure 20.—A hob-grinding machine patented in 1932 and incorporating the master-screw principle. Carl G. Olson's patent 1874592. new but had hitherto been solved by increasing the size of the parts, an avenue of limited utility to de- signers in these fields where total weight as well as the effects of mass and inertia are so important. By making these parts of heat-treated steel, the strength could be made suitable while the size and mass of the parts were kept within bounds. The necessary proc- esses of heat-treating were not always applicable to finished parts as they sometimes destroyed both finish and accuracy. Grinding, which was well developed for the simple plane, cylindrical, and conical surfaces so widel) used in mechanisms, had to be extended to threads and gears so that they could be finished after heat-treating. Sometimes the gear teeth themselves were ground; for other applications it was sufficient to improve the accuracy of the gear cutters. Attempts to produce gear hobs free of the imper- fe2, filed June «, 1929, issued to C G Olson of Chicago, Illinois, August 30, 1932, and assigned to the Illinois Tool Works, also of Chicago. 1,1 III ll\ 240: CONTRIBUTIONS FROM Mil, MI'SFI'M OF HISTORY AND TFCHNOLOGY. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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