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Mechanical drawing for secondary schools (1916)

Crawshaw, Fred D. (Fred Duane), b. 1874, Phillips, J. D. (James David), 1869- joint author · Chicago, New York, Scott, Foresman and company · leaf 253

An illustration from Mechanical drawing for secondary schools, 1916, leaf 253
ral drawing number. 5. Shop drawing number. 6. Erection drawing number. 7. Material from which each piece is made, 8. Pattern number if cast. 9. Where used. 10. Estimated weight. 11. Order number. 248 MECHANICAL DRAWING l 3i f > < -3 > ^ T? 4 -4 ^ 4 ^^4 ^ •0,5514-^ ir 5wm^Arm -i- —frrt.— 5… … Fig. 280. Construction of the Helix The bill of material includes standard parts such as bolts andscrews which are not detailed on the drawings. A simple bill ofmaterial is shown in Fig. 279. ADVANCED DRAWING 249 Screw Threads. The curve of the screw thread is the helix.It is generated by a point…

Mechanical drawing

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

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