. American engineer and railroad journal . awing a mitergear. If the different viewsare not on the. same sheetor not in such relation toeach other as to permit theprojection o the .teethfrom the plan to other views, as is the case with figs. 362 and 363,these lines—as a a, E D and h b, fig. 362, corresponding toa a , D E and b b of fig. 361—should be drawn in pencil,and the points of the teeth can then be projected to them,as indicated by dotted lines in fig. 362. Then take the distanceof each point of intersection, as i, I, 2, 2, 3, 3, etc., of theprojection lines with a a,D E and h b, from t
. American engineer and railroad journal . awing a mitergear. If the different viewsare not on the. same sheetor not in such relation toeach other as to permit theprojection o the .teethfrom the plan to other views, as is the case with figs. 362 and 363,these lines—as a a, E D and h b, fig. 362, corresponding toa a , D E and b b of fig. 361—should be drawn in pencil,and the points of the teeth can then be projected to them,as indicated by dotted lines in fig. 362. Then take the distanceof each point of intersection, as i, I, 2, 2, 3, 3, etc., of theprojection lines with a a,D E and h b, from the center lineK A B with a pair of dividers, and transfer it to the correspond-ing line in the end view, fig. 363. It is of course more con-venient to draw the plan immediately above or below the endview ; but in some cases it is not possible to place the views insuch relation to each other. This is the case with the thre«views of the pinion shown in figs. 361, 362 and 363. In the teeth might be projected from the end view of. \S Fig. 362. V«l. LXVl. Ho. 1.] ENGINEERING JOURNAL. 39 the pinion shown in fig. 363. Obviously, if the plan is placedin such a position that the teeth of the pinion tan be projectedfrom its end view to both tig. 361 and tig. 363. then it would beimpossible to project the teeth of the wheel from its plan to theside view, fig. 361. Therefore a plan or side view (cr possiblyboth) of the pinion should be drawn in pencil in fig. 363, asindicated by dotted lines, to which the teeth can be projected,and the points thus determined can then be transferred to theappropriate views with a pair of dividers. In drawing a wheel and pinion in gear with each other it will The student will find that drawing a pair of bevel wheels cor-rectly is quite a difficult problem, which requires a good deal ofskill. The examples given should be drawn either half or fullsize, as a beginner will find it less dilficult to draw such wheelson a large scale than it is to rep
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
