Machine drawing; a text and problem book for technical students and draftsmen (1921)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 162
es lengthwise of the cyUnder while it is movingequal distances around the cylinder. In Fig. 249 the diameter and pitch of the helix are indicated. Divide the circleof the top view into any convenient number of equal parts, and draw vertical linesthrough each point. Divide the pitch distance into… … Fig. 249. The Helix. 151 152 MACHINE DRAWING of the circle will locate a point on the projection of the helix. Proceed in this wayfor each of the points. It is desirable to locate extra points by taking half divisionswhere the curve changes direction as at A. 192. Screws and Bolts.—The following…
Machinery
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