Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1883)
and below the pitch line G G. At a rigluangle to G G draw the line J K ; and from where thisline meets B, as at O, mark the arc a, which will repre-sent the pitch circle for die large diameter of the pinion DAAUIXG GEAR WHEELS. 20; D. [The smallest wheel of a pair of gears is terniedthe pinion.]… … Fig. 242. and {, arc g representing the pitch circle, i the height,and h the depth of the tooth. On these arcs drawthe proper tooth curves in the same manner as for■spur wheels; that is, obtain the curves by the construe- 2o6 MECHANICAL DRAWING SELF-TAUGHT. tion shown In Figures 237, or by those In…
Mechanical drawing
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