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acting action angle applied approach arrangement axis base bearing belt bevel block body brake carried centre coefficient of friction constant couple curves cycloidal described determine diameter direction displacement distance draw driving dynamometer efficiency effort engine equal equation EXAMPLE experiments Explain faces feet figure fixed flanks force gearing give given greater grooves Hence horizontal horse-power inches inclined increase involute journal LECTURE length lever load lubrication machine means measured method minute motion moving obtained ordinary pair parallel pinion pitch circle pivot plane position pressure Principle pulley rack radius represents resistance respectively rolling rope rotation screw shaft shown side speed square Suppose surfaces taken teeth tension tooth train transmitted turn velocity vertical weight wheels
Сторінка 240 - 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 234 - 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 242 - 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 326 - ... 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.