There are two points to be considered in setting line-shafting in line. One is that it should be either horizontally or vertically in line with its journal; the other that the line-shaft and counter-shafting should be in line with each other. Unless these precautions are taken much difficulty will be experienced in the trailing of the belts. One of the best methods of making sure that two shafts are in line with each other is to place two slender reach poles or rods of exactly the same length from one shaft to the other at their opposite ends. The shaft may then be adjusted until the distance is the same at each end.
Fig. 140. - Heavy Head Shaft Hanger.