Installing efficiency methods

by C.E. Knoeppel

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 ...time study will show how rest was considered, and the influence it exerted. Highest time recorded per piece--3.0 minutes. Lowest time recorded per piece--1.55 minutes. Best time for short run--5 pieces in 10 minutes. The operation was intensely fatiguing, yet you will notice that in the fourth hour after starting the study, or the ninth from starting time in the morning, the worker did his best work. The average pieces per hour for the four hours run was 20.7 as against 15.8 in the morning--an increase of 32.6 per cent. It may be well to say in connection that the man subsequently attained an efficiency between 95 per cent and 100 per cent on this work. To illustrate more clearly how the stop watch can be used to advantage in determining the part fatigue plays in work, the following figures will be found interesting to the student of the human. A man grinding castings on a 6-foot grindstone was studied for 1.8 hours. At the beginning of the work 21 pieces were studied, showing an average time of.739 minutes per piece. When about one-half of the work had been completed, 16 pieces were carefully timed, which showed an average time of.907 minutes per piece. As the man was about to finish, 8 pieces were studied with an average time of 1.07 minutes per piece. The showing is as At beginning 21 pieces. 739 minutes Base One-halfway 16".907" 22.7 per cent above base At finish 8" 1.070" 44.8"" The chart (Fig. 11) shows the effect of fatigue on this operator. The man worked consistently and there was no sign or evidence of loafing. During the first part of the work, he turned out several pieces in times ranging from.59 to.75 minutes each. The work to be done was fairly constant, and consisted of grinding the same surface each tim...

76 pages, Paperback

First published June 1, 2008