PPT-LIMITS,FITS AND TOLERANCE

BY PROF KHAN AAMIR TERMINOLOGY BASIC SIZE It is the standard size of a part with reference to which all the limits of variations of size are determined ZERO LINE the line corresponding to basic size is called as zero line. see page 3 Holds up to 6 times more dust dirt sand and hair vs traditional mops and other disposable dusting systems 3M Easy Scrub Express System see page 4 Operatorcontrolled dispensing mechanism helps cut chemical waste by as much as 80 vs mop and ContentsContentsi1Introduction11.1BriefhistoryofFITS..................................................11.2Versionhistoryofthisdocument............................................11.3Acknowledgments... Lecture 2 – Clearance Fits. Cylindrical Fits. 2. Cylindrical Fits – English Units. 3. Cylindrical Fits – English Units. 4. Cylindrical Fits – English Units. 5. Cylindrical Fits – English Units. Datum and Tolerance Accumulation . Possible Tolerance Conditions . Block Example . Specific Tolerances for Slip and Press Fits. Machine Tolerances . Tolerance Block . This presentation includes the following concepts . 56.6. 100. 99. 9.6. 9.4. 25.5. 25.4. 36. 34. 41.3. 41.1. 20.00 - 20.13. 0.14. A. C. B. M42 X 1.5 - 6g. 0.1 M B M. 0.06 A. 6.6. 6.1. 9.6. 9.4. 44.60. 44.45. 0.08 M A. C. A. 0.02. 31.8. 31.6. 180.00 181.00 Humans are often spoken of as behaving like animals. Vast experimental study of animal reflexes and proclivities has disclosed reliable benign behaviors to be predictable when the cr Digital Preservation 2012. Andrea Goethals. File Information Tool Set. Offset risk of accepting . any. format. Web archives, email attachments, opaque objects. No single format identification tool can suffice (format support varies, accuracy varies. Tolerances & Allowances. Accuracy and Precision. Metrology standards. Sensitivity or resolution is the smallest dimension that can be read on an instrument. Standard measurement should do at the temperature. TOLERANCE. . =. GOOD. INTOLERANCE. . =. BAD. TOLERANCE. . i. s a . patience toward a practice or opinion . that one disapproves of. TOLERANCE. . is inevitably connected with . disagreement. and . Introduction to Standard Geometrical Tolerance Datum and Tolerance Accumulation Possible Tolerance Conditions Block Example Specific Tolerances for Slip and Press Fits Machine Tolerances Tolerance Block 9.4. 25.5. 25.4. 36. 34. 41.3. 41.1. 20.00 - 20.13. 0.14. A. C. B. M42 X 1.5 - 6g. 0.1 M B M. 0.06 A. 6.6. 6.1. 9.6. 9.4. 44.60. 44.45. 0.08 M A. C. A. 0.02. 31.8. 31.6. 0.1. B. 8X 7.9 - 8.1. NEED OF LIMITS, FITS & TOLERANCES. Human inaccuracy, errors ,lack of sophistication ,nature of job material .. TERNOLOGY . Nominal Size: . It is the size . . represented on the drawing. . . Basic Size : . TOLERANCES. Tolerance. . is the total amount that a specific dimension is permitted to vary in positive or negative side. It is the difference between the maximum and the minimum limits for the dimension.. Let us consider a shaft having a dimension of 40 ± 0.05 mm. . The maximum metal limit (MML) of the shaft will have a dimension of 40.05 mm because at this higher limit, the shaft will have the maximum possible amount of metal. .