Abstract
The author begins by enunciating the principle that, given good design, a machine will work properly when the material, the fits and tolerances, and the quality of the surfaces are chosen to suit the working conditions, and then gives examples to show the improvement effected by proper attention to suitable fits, tolerances and working surfaces.
The use of pen records to provide data for surface finish is dealt with, and an account is given of comparative tests of British and German aero-engine parts. Fits for various functions are discussed and attention is paid to problems relating to lathe spindles, and the surfaces of fuel injectors. Ground and scraped surfaces are compared, and further sections are devoted to micro-finish by honing, the superfinishing process, and the dulling criterion for finishing tools.
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