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ASSIGNMENT NO. 22009DIMENSIONSMACHINE DESIGN & CAD -IKHALIL RAZA BHATTI07ME40<br />Important terms used in limit system<br />The following terms used in limit system are important:<br />Nominal size: IT is the size of a part specified in the drawing as matter of convenience.<br />Basic size: IT is the size of a part to which all limits of variation are applied to arrive at final dimensioning of the mating parts.<br />Actual size: IT is the actual measured dimension of the part. The difference between the basic size and the actual size should not exceed a certain limit; otherwise it will interfere with the interchangeability of the mating parts.<br />Limits of sizes: THERE are two extreme permissible sizes for a dimension of the part, the largest permissible size for a dimension of the part is called upper or higher or maximum limit, whereas the smallest size of the part is known as lower or minimum limit.<br />Tolerance zone: IT is the zone between the maximum and minimum limit size.<br />Zero line: IT is a straight line corresponding to the basic size. The deviations are measured from this line. <br />Upper deviation: IT is the algebraic difference between the maximum size and the basic size. The upper deviation of a hole is represented by a symbol EL (Ecart superior) and of a shaft by es.<br />Lower deviation: IT is the algebraic difference between the minimum size and the basic size. The upper deviation of a hole is represented by a symbol EI (Ecart inferior) and of a shaft by ei.<br />Actual deviation: IT is the algebraic difference between an actual size and the corresponding basic size.<br />Mean deviation: IT the arithmetical mean between the upper and lower deviations.<br />Fundamental Deviation: IT is one of the two deviations which are conventionally chosen to define the position of the tolerance zone in relation to zero line.<br />Tolerance: IT is the difference between the upper limit and lower limit of a dimension in other works; it is the maximum permissible variation in a dimension. The tolerance may be unilateral or bilateral. When all the tolerance is allowed one side of the nominal size, e.g.20-0.000+0.000, then it is said to be unilateral system of tolerance. The unilateral system is mostly used in industries as it permits changing the tolerance value while still retaining the same allowance or type of fit. When the tolerance is allowed on both sides of the nominal size, e.g. 20-0.002+0.002, then it is said to be bilateral system of tolerance. In this case +0.002 is the upper limit and -0.002 is the lower limit.<br />Allowance: IT is the difference between the basic dimensions of the mating parts. The allowance may be positive or negative. When the shaft size is less than the hole size, then the allowance is positive and when the shaft size is greater than the hole size, then the allowance is negative.<br />Clearance: IT is the amount by which the actual size of the shaft is less than the actual size of the mating hole in an assembly as shown in fig (a). In other words, the clearance is the difference between the sizes of the hole and the shaft before assembly. The difference must be positive<br />Interference: IT is the amount by which the actual size of a shaft is larger than the actual finished size of the mating hole in an assembly, as shown in fig (b). In other words, the interference is the arithmetic difference between the sizes of the hole and the shaft, before assembly. The difference must be negative.<br />20-0.004                                                                                               +0.0020-0.002+0.002<br />           UNILATERAL TOLERANCEBILATERAL TOLERANCE<br />Fits:<br />Fits are classified into following thee groups<br />,[object Object]
Interference FIT: in this type of fit the size limits for the mating parts are so selected the interference between them always occur as shown in fig.
In an interference fit, the difference between the maximum size of the hole and the minimum size of the shaft is known as minimum interference. In an, interference fit the difference between the minimum size of the hole and the maximum size of the shaft is known as maximum interference.
Transition fits: in this type of fit, the size limits for the mating are so selected that either a clearance or interference may occur depending upon the actual size of the mating pars as shown in fig. The transition fit may be force fit, tight fit and push fit.Surface roughness and its measurement:<br />A little consideration will show that surfaces produced by different machining operation like milling turning, shaping etc. are of different characteristics. They show marked variations when compared with each other. The variation is judged by the super finishing is the smoothest, while that by planning is the roughest. In order to prevent stress concentrations and proper functioning, it may be necessary to avoid or to have certain surface roughness.<br />There are many ways of expressing the surface roughness numerically, but the following two methods are commonly used:<br />,[object Object]
Root mean square methodCentre line average method:<br />IT Is defined as the average value of the ordinates between the surface and the main line, measured on both sides of it. According to Indian standards, the surface finish is measured in terms of CLA value and it is denoted Ra.<br />CLA = y1+y2+y3+…ynn<br />Root mean square method:IT is defined as squares root of the arithmetic mean of squares of the ordinates. <br />Mathematically <br />R.M.S= y12+y22+y32+…yn2n<br />
Dimensions 07 Me40

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Dimensions 07 Me40

  • 1.
  • 2. Interference FIT: in this type of fit the size limits for the mating parts are so selected the interference between them always occur as shown in fig.
  • 3. In an interference fit, the difference between the maximum size of the hole and the minimum size of the shaft is known as minimum interference. In an, interference fit the difference between the minimum size of the hole and the maximum size of the shaft is known as maximum interference.
  • 4.
  • 5. Root mean square methodCentre line average method:<br />IT Is defined as the average value of the ordinates between the surface and the main line, measured on both sides of it. According to Indian standards, the surface finish is measured in terms of CLA value and it is denoted Ra.<br />CLA = y1+y2+y3+…ynn<br />Root mean square method:IT is defined as squares root of the arithmetic mean of squares of the ordinates. <br />Mathematically <br />R.M.S= y12+y22+y32+…yn2n<br />