ew 105 Art. 26. The Screw Fig. 109 shows a common square-threaded screw whichcan revolve in the fixed nut N. The force P is hereapplied to a bar inserted in the head, this force actingin a plane normal to the axis of the screw. When thescrew is turned by the force P, acting with lever arm Iwith… … c c B A Fig. 109 Fig. 110 When a right-angled triangle has a base equal to thecircumference of a cylinder and is wrapped around thatcylinder, its hypothenuse forms a curve on the cylindricalsurface which is called a helix. Thus in Fig. 110 let rbe the radius of a cylinder and 2nr its…
Mechanics
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