Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . Fig. 108. Diagram Showing Method ofLocating Belt Holes MACHINE DRAWING 129 and the belt, in passing from A to C, twists through an angle of 180°,and the line which was at aa will occupy the position cc. There-fore, when the belt has passed from A to H, it will have twisted. Fig. 109. Diagram Showing Location of Holes for Crossed Belt through an angle which will bear the same relation to 180° that thedistance
Machine drawing; a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator . Fig. 108. Diagram Showing Method ofLocating Belt Holes MACHINE DRAWING 129 and the belt, in passing from A to C, twists through an angle of 180°,and the line which was at aa will occupy the position cc. There-fore, when the belt has passed from A to H, it will have twisted. Fig. 109. Diagram Showing Location of Holes for Crossed Belt through an angle which will bear the same relation to 180° that thedistance AH bears to the distance AC. That is, if AH = \ of AC,the angle JGK is \ of 180°, or 45°. Whether the angle JGK shallbe laid off to the right or to the left of line HK, must be reasonedout by considering which way the belt twists in passing A to C. Theangle of the other belt hole (LFM) is determined in the same way. 130 MACHINE DRAWING Fig. 110 shows the method of finding the belt holes of a plainquarter-twist belt, similar to Fig. 98. The centers G and F in planare found by projecting from the elevation, as shown by the con-struction lines. The angle which the center line of hole at G makeswith the center line of the shaft, is found by dividing 90° in the ratioof the distances P and N. The angle of the center line of the belt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublis, booksubjectmachinery
