A textbook of machine design

... that you design 41.7.2 Three Positions of a Plane When three positions of a plane are specified by the location of line CD, as shown in Fig 41.9, it is possible to construct the center of a circle ... number of links (fixed link included) j = number of joints ft = /of /th joint K = integer = for plane, spherical, or particular spatial linkages = for most spatial linkages Since...

Ngày tải lên: 17/10/2013, 12:15

... that depends on the nature of joints Some representative values of C’s are tabulated in Table below Table Values of C for various types of joints Type of joint Value of C Metal to metal joint ... adequate load of variable magnitude Design of two important mechanical joints is discussed below, namely, bolted and welded joints Bolted joints with variable loading: Consider des...

Ngày tải lên: 18/10/2013, 09:15

... intelligently followed the cycle-profile procedure, a complete graphic portrayal of what should happen at any point in the cycle of operation of the machine is the result The designer should be able to ... of the many types of flow control valves in combination with one of the basic methods of flow control described previously Another approach takes advantage of the throttli...

Ngày tải lên: 19/10/2013, 20:15

... analysis in designing open-loop circuits and dynamic load analysis in designing closed-loop systems The cycle profile1 is the recommended technique for displaying the results of machine- cycle-load ... first step is to analyze the machine cycle This analysis turns out to be a timeand-motion study of the operation of the machine If an actual study is not available to the designer, s...

Ngày tải lên: 19/10/2013, 20:15

... Much of the design work done is in a small part of one of the feedback or feedforward portions of the chart and thus is evolutionary Rarely will an individual designer start at the beginning of ... characteristic of the pro- TABLE 1.11 Elements of a Decision-Making Model Alternative courses of action States of nature: The environment of operation of the decision model...

Ngày tải lên: 19/10/2013, 20:15

... incorporated in the design of machinery either by treating the sources of machine noise or by altering the structureborne and/or airborne paths of this noise This section contains a discussion of these ... fields in the vicinity of a noise source frequency of the sound, the dimensions of the source, and the phase relations of the various radiating parts of the source As...

Ngày tải lên: 23/10/2013, 18:15

... shallow tacked at rate of 10 mpy; commerdepths of Pacific off Panama Canal cial grade often corrodes at 100 Single phase brasses, silicon and times this rate, largely because of phosphor bronzes ... attack rate of the more active metal and decreases that of the less active metal An adverse area ratio is characterized by having a larger surface area of less active metal than that...

Ngày tải lên: 23/10/2013, 18:15

... Validity of mathematical models used to represent reality Intensity of stress concentrations Influence of time on strength and geometry Effect of corrosion • Effect of wear • Length of any list of ... magnitude, but in the pattern of variation Evidence gathered by measurement in pursuit of uniqueness of magnitude was really a mix of systematic and random effects It is th...

Ngày tải lên: 23/10/2013, 18:15

... affecting machines and their designers is most often filed under negligence or strict liability theories, both of which may allege the presence of a defect Thus a major concern of designers would ... representations of performance and operation (implied warranty); conduct of designers, manufacturers, sellers, and users (negligence); and the characteristics of the product exclusive...

Ngày tải lên: 23/10/2013, 18:15

... used design parameters 13.1.1 Flexible Machine Elements Belt drives are called flexible machine elements Flexible machine elements are used for a large number of industrial applications, some of ... of rotation is observed Version ME , IIT Kharagpur 13.1.3 Nomenclature of Open Belt Drive β dL dL - Diameter of the larger pulley dS – Diameter of the smaller pulley αS αL αL-...

Ngày tải lên: 25/10/2013, 12:15

... belt Coefficient of friction of the belt material Coefficient of friction for a pair of belt material and pulley material is provided in design data book 13.2.4 Modification of Belt stress When ... specifications Types of design factors A sample design procedure 13.2.1 Flat belt drives Flat belts drives can be used for large amount of power transmission and there is no upp...

Ngày tải lên: 25/10/2013, 12:15

... y' = 0.154 − 37 TE TE = 1074 n A Textbook of Machine Design First of all let us find the module of teeth Let m = Module in mm, and DP = Pitch circle diameter of the pinion in mm We know that ... Ans 1078 n A Textbook of Machine Design Design for the rim The thickness of the rim for the pinion may be taken as 1.6 m to 1.9 m, where m is the module Let us take thickness of...

Ngày tải lên: 25/10/2013, 13:15

... are they designed as universal tools Industrial robots are designed with specific types of application in mind, and this fact very strongly influences the design of both hardware and software ... the design of mountings of the drive components and of the support bearings of the input and output shafts to ensure good service life Cycloidal drives, now on the market in several t...

Ngày tải lên: 28/10/2013, 01:15

... nF = speed of first gear in train nL = speed of last gear in train HA = speed of arm The following example will illustrate the use of Eq (46.15) Example Refer to the planetary train of Fig 46.4 ... r/min of the left wheel is zero, the pitch point of gears and has a linear velocity twice that of the pin which supports the planet Therefore, the r/min of the right wheel is twic...

Ngày tải lên: 28/10/2013, 01:15

... an indication of the development of systematic errors in the measuring system Measurement of the variable with two different measuring systems can often help detect the presence of a fixed error ... removal of the noise source, elimination of the noise by cancellation, minimization of the noise by division (filtering), and minimization of the noise by frequency-selective filte...

Ngày tải lên: 28/10/2013, 01:15