A Text-book on Applied Mechanics: Specially Arranged for the Use of Science and Art, City and Guilds of London Institute and Other Engineering Students, Том 1Charles Griffin, 1895 |
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Загальні терміни та фрази
addendum circles angle angle of repose angular velocity applied approach and recess arcs of approach axis base circle bearing belt or rope bevel wheels brake centre coefficient of friction curves CYCLOIDAL TEETH d₁ d₂ diameter direction displacement driving dynamometer efficiency engine epicyclic train epicycloid equal equation Exam EXAMPLE flanks force frictional resistance frustrum ft.-lbs grooves Hence horizontal horse-power hypocycloid inclined plane involute teeth journal leading screw leather length lever load lubrication machine motion N₂ number of revolutions number of teeth ordinary P₁ P₂ pair of teeth pair of wheels parallel pinion pitch circle pitch surfaces pivot pressure Principle of Moments pulley R₁ R₂ rack radius ratchet ratio revolutions per minute rotation screw shaft shown Sketch speed spur wheel square inch tangent tension velocity-ratio vertical W₁ W₂ weight wheels in gear wire ropes وو
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Сторінка 242 - A cycloid is a curve traced out by a point on the circumference of a circle which rolls along a straight line. The form of this curve will be understood from the accompanying figure.
Сторінка 1 - We may add to these principles a definition of a force, which is equally and absolutely complete : force is that which produces, or tends to produce, motion, or change of motion, in bodies.
Сторінка 236 - The pitch of the teeth is the distance from the centre of one tooth to the centre of the next tooth, measured along the pitch line.
Сторінка 34 - DEFINITION. — The Moment of a couple is the product of one of the equal forces into the arm.
Сторінка 93 - It is worthy of mention that two opposite radial grooves were found to act better than three or four or any other number. t The true leverage of the chain is the actual leverage divided by the distance from the centre of the shaft to the centre of frictional resistance, which was assumed to be in this case 1 inch from the centre of the shaft. The centre of frictional resistance being assumed to be 1 inch from the centre of the shaft, we have : — F x 1 = S x L ie, the moment of frictioual resistance...
Сторінка 244 - The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Сторінка 35 - Now, the moment of a couple about any point in its plane is equal to the product of one of its equal forces into the perpendicular distance between their directions.
Сторінка 52 - Or, a machine may be defined to be a combination of resistant bodies whose relative motions are completely constrained, and by means of which the natural energies at our disposal may be transformed into any special form of work.
Сторінка 18 - Of course, the student will readily see that it is not always necessary to construct a diagram of work before arriving at the answer. All that is necessary to know, is the mean resistance during the displacement. Thus, in the above example, the mean resistance is the arithmetical mean between the initial and final resistances. This, multiplied by the displacement. gives the answer. EXAMPLE IV. — Four cwts. of material are drawn from a depth of 80 fathoms by a rope weighing 1'15 Ibs. per linear...
Сторінка 328 - ... of importance and should be considered for each case. The ropes commonly used for the transmission of power in factories or mills vary from 3 to 5 inches in circumference. No matter what the diameter of the pulley may be, ropes of 1| inches diameter should not be exceeded for main drives, and ij inches diameter for secondary drives.