. Official proceedings . Fig. 3—Portable Profilometer for Measuring Surface Roughness. roughness of the tooth surfaces, and since no instrumentswere available for this purpose, it was necessary to developsuch an instrument. This led to additional work in the meas-urement of surfaces of bearings, cylinders, shafts, axles andother machine parts. This has become quite a field in itself,and one of the recent developments is the portable Profilometer,shown in Fig. 3. The instrument consists of two parts: a small tracer unitshown in the hand, and an instrument box which carries the 15. 0 indicator m
. Official proceedings . Fig. 3—Portable Profilometer for Measuring Surface Roughness. roughness of the tooth surfaces, and since no instrumentswere available for this purpose, it was necessary to developsuch an instrument. This led to additional work in the meas-urement of surfaces of bearings, cylinders, shafts, axles andother machine parts. This has become quite a field in itself,and one of the recent developments is the portable Profilometer,shown in Fig. 3. The instrument consists of two parts: a small tracer unitshown in the hand, and an instrument box which carries the 15. 0 indicator meter. The tracer is drawn across the surfacewhose roughness it is desired to measure, and the metershows a continuous running average of the height of thesurface irregularities. It is cahbrated directly in millionthsof an inch, and has different ranges to cover the various de-grees of roughness found in practice. It serves as an ac-curate and rapid means for measuring roughness, and mark-ed improvements in the production, and life of machine partshave been obtained with the aid of this instrument. Diasfnosing Fundamental Causes of Noise fromSound Measurements. It often happens that acoustical measurements yield un-expected but very definite information concerning the mechan-ism of a machine and indicate where improvements may bemade to advantage. Fig. 4 shows a large reduction gear onwhich this was done. The initial purpose of the work was to determine noisespecifications for this type of unit so that a central-stationcompany could include them in the order for their next
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