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Metrology and Quality Control.pptx

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Metrology and Quality Control.pptx

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Application of Metrology instruments to measure 5 features of any one component available in our PROJECT LAB (each feature measurement 5 times). Present the data in the form of bar-chart and pi-chart.

Application of Metrology instruments to measure 5 features of any one component available in our PROJECT LAB (each feature measurement 5 times). Present the data in the form of bar-chart and pi-chart.

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Metrology and Quality Control.pptx

  1. 1. Department of Mechanical Engineering Metrology and Quality Control Topic-Application of Metrology instruments to measure 5 features of any one component available in our PROJECT LAB (each feature measurement 5 times). Present the data in the form of bar-chart and pi-chart. Present by-
  2. 2. Content Introduction  Instruments used in case study  Research Case Study  Sample Calculation for profile Projector  Pie and bar charts  Conclusion  References
  3. 3. Introduction Linear measuring instruments are designed either for line measurements or end Measurements. In end measuring instruments, the measurement is taken between two end surfaces as in micrometer, slip gauge. Linear measurement applied to measurement applies to measurement of lengths, diameters heights and thickness including external and internal measurements. The instruments used for linear measurement can be classified as 1. Direct measuring instrument. 2. Indirect measuring instruments The direct measuring instruments are of two types- (i) Graduated (ii) Non- graduated  The graduated instruments include rules, vernier caliper, vernier height gauge, vernier depth gauge, micrometer, dial indicator etc.  The non-graduated instruments includes calipers trammels, telescope gauge, surface gauge, straight edges, wire gauge, screw pitch gauges, etc.
  4. 4. 1. Vernier caliper Vernier caliper is linear measuring instrument which has of two scale one is fixed and other is movable. the zero of the vernier scale coincides with zero of main scale. For precise setting of the movable jaw an adjustment screw is provided. Also arrangement screw is provided to lock the sliding scale on the fixed main scale. Vernier calipers are employed for both internal and external measurements. Instruments used in this case study Least count of vernier caliper is 0.02mm Smallest division on main scale 1 Least count = -------------------------------------------- = -------------- No. of divisions on vernier scale 50 Least count = 0.02 mm
  5. 5. 2.Micrometer  It consists of an accurate screw with about 10 or 20 threads per cm revolving in a fixed nut.  The accuracy of micrometer depends upon the accuracy of the spindle screw threads.  Ratchet- It controls the pressure applied for accurate measurement.  Barrel- It has fixed graduations which are clearly engraved on it and blackened for reading  Anvil- When the spindle touches the anvil then thimble cannot be rotated further in forward direction least count. The thimble which is the moveable or circular scale is divided into 50 equal parts. Every graduation is numbered from 0 to 50. Principle- It works on the principle of movement of a nut and a screw both of which have accurately cut threads. Least count of Micrometer is 0.01mm Smallest division on main scale 0.5 Least count = ----------------------------------------------- = --------------------- Total no. of division on circular scale. 50 Least count = 0.01 mm
  6. 6. 3. Profile Projector  Profile projectors (optical comparators) are a type of optical measuring instrument.  The measurement principle is similar to that of optical microscopes.  The target is placed on the stage, and a light is shined on the target from underneath.  This causes the target's profile, or shadow, to be projected on the screen.  An optical system called a "telecentric optical system" is used in the profile projector so that it can be projected with accurate magnification from any position on the stage.  Telecentric lenses, on the contrary, project the same size for near and far objects.
  7. 7. Research Case Study Fig.a) Object Fig.b) Thread Terminology Fig.c) Dimensions of object
  8. 8. Readings by vernier caliper for dimension k No. of readings Main scale reading (MSR) mm Vernier scale reading (VSR) mm Total Reading mm 1. 6 18 6.36 2. 6 10 6.20 3. 6 5 6.10 4. 6 19 6.38 5. 6 23 6.46 Sample Calculation for vernier caliper Total reading = MSR+ (LC * VSR) Total reading = 6+ (0.02*18) Total reading = 6.36 mm
  9. 9. Readings by vernier caliper for dimension S No. of readings Main scale reading (MSR) mm Vernier scale reading (VSR) mm Total Reading mm 1. 16 24 16.48 2. 16 24 16.48 3. 16 23 16.46 4. 16 24 16.48 5. 16 23 16.46 Readings by vernier caliper for dimension b No. of readings Main scale reading (MSR) mm Vernier scale reading (VSR) mm Total Reading mm 1. 31 34 31.68 2. 31 20 31.40 3. 31 33 31.66 4. 31 34 31.68 5. 31 32 31.64
  10. 10. Readings by Micrometer screw gauge for dimension d1 No. of readings Main scale reading (MSR) mm Circular scale reading (CSR) mm Total Reading mm 1. 9.5 47 9.97 2. 9.5 46 9.96 3. 9.5 46 9.96 4. 9.5 47 9.97 5. 9.5 46 9.96 Sample calculation for micrometer Total reading = MSR + ( LC* CSR ) Total reading = 9.5 + ( 0.01* 47) Total reading = 9.97 mm
  11. 11. Readings by Profile Projector for Major diameter Sr . no R1 co- ordinate mm R4 co- ordinate mm Major diameter = R4 - R1 mm 1. 2.71 12.34 9.63 2. 2.65 12.34 9.67 3. 2.58 12.34 9.76 4. 2.68 12.33 9.65 5. 2.65 12.34 9.67 Sample Calculation for profile Projector At R1 co-ordinate the main scale reading (MSR) for micrometer = 2.5 mm and circular scale reading (CSR) is = 21mm R1 = MSR + (LC * CSR) R1= 2.5 + (0.01 * 21) R1= 2.71 mm Similarly for R4, At R1 co-ordinate the main scale reading (MSR) for micrometer = 12 mm And circular scale reading (CSR) is = 34mm so, R4 = MSR + (LC * CSR) R4= 12 + (0.01 * 34) R4= 12.34 mm So, Major diameter = R4 - R1 Major diameter = 12.34 – 2.71 Major diameter = 9.63 mm
  12. 12. Readings by Profile Projector for Minor diameter Sr. no R2 co- ordinate mm R3 co- ordinate mm Minor diameter = R3 – R2 mm 1. 3.38 11.51 8.13 2. 3.39 11.54 8.15 3. 3.37 11.99 8.62 4. 3.96 12.10 8.14 5. 3.39 11.54 8.15 Readings by Profile Projector for Pitch Sr. no P1 co- ordinate mm P2co- ordinate mm Pitch = P2 – P1 mm 1. 14.82 15.29 0.47 2. 11.67 12.20 0.53 3. 11.49 11.99 0.50 4. 11.58 12.10 0.52 5. 11.08 11.54 0.46
  13. 13. Pi and bar charts by vernier caliper for dimension 5.9 6 6.1 6.2 6.3 6.4 6.5 1 2 3 4 5 Readings in mm No of Reading Vernier Caliper Series1
  14. 14. Readings by vernier caliper for dimension b
  15. 15. Readings by vernier caliper for dimension b 20% 20% 20% 20% 20% Vernier Caliper 1 2 3 4 5
  16. 16. Readings by Micrometer screw gauge for dimension d1 20% 20% 20% 20% 20% Micrometer Screw Gauge 1 2 3 4 5 9.954 9.956 9.958 9.96 9.962 9.964 9.966 9.968 9.97 1 2 3 4 5 Series1, 9.96 Readings in mm No of redings Micrometer Screw Gauge
  17. 17. Readings by Profile Projector for Major diameter 20% 20% 20% 20% 20% Profile Projector 1 2 3 4 5 9.56 9.58 9.6 9.62 9.64 9.66 9.68 9.7 9.72 9.74 9.76 1 2 3 4 5 Series1, 9.67 Readings in mm No of reading Profile Projector
  18. 18. Readings by Profile Projector for Minor diameter 19% 20% 21% 20% 20% Profile Projector 1 2 3 4 5 7.8 7.9 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 1 2 3 4 5 Series1, 8.15 Readings in mm No of reading Profile Projector
  19. 19. Readings by Profile Projector for Pitch 19% 21% 20% 21% 19% Profile Projector 1 2 3 4 5 0.42 0.44 0.46 0.48 0.5 0.52 0.54 1 2 3 4 5 Series1, 0.46 Axis Title Axis Title Profile Projector

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