Applied Mechanics And Strength Of Materials by A. B. Clemens

By A. B. Clemens

Observe. This quantity is made of a couple of separate components, or sections, as indicated through their titles, and the web page numbers of every often commence with 1. during this checklist of contents the titles of the elements are given within the order within which they seem within the booklet, and tinder each one identify is an entire synopsis of the topics treated.

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20, is a. mechanism for producing It will be seen that it the application of a small effort. resembles the steam-engine mechanism with crank and cona F is The effort of about the same length. at the slide. applied at the joint B and the resistance The mechanical advantage, that is, the ratio of resistance It is to effort, depends on the angle between the links. evident that the point Q is the instantaneous center of necting-rod P motion of the link \-~* o _ ri- 1H' Ag Now> angle that smaller, the the ag ABQ becomes is, as links approach the position in which they would form a straight horizontal FIG 20 line, .

The chief objection that has been raised varied the velocity against involute teeth is the obliquity of action, which causes increased pressure on the bearings. If the obliquity does not exceed 15, however, this objection is not serious. PROPORTIONS OF GEAR-TEETH 24. Circular Pitch. The circular pitch of a gear has been denned as the distance between corresponding points on adjacent teeth measured along the pitch circle. It is obtained by dividing the circumference of the pitch circle by the number of teeth in the gear.

The rod /, instead of vibrating equally above and below a center line of motion is so arranged that the force moving the ram during the cutting stroke will always be downwards, causing it to rest firmly y on the guides. 25. To lay out the motion, proceed as follows: Draw he center line S T, Fig. 22, and parallel to it the line mn he distance between the two being equal to one-half the ongest stroke of the tool. About 0, which is assumed to be the center of the gear, describe the circle bdc with a radius equal to the distance from the center of , the center of the gear #, Fig.

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