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# Week 2 benchwork measurement

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miss tasneem- mechanical lab 2 (mechanical engineering)

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### Week 2 benchwork measurement

1. 1. Measurement, Marking out &Fitting Practice
2. 2. STEEL RULER FEATURES : – Made from Stainless Steel. – Size available : 150mm up to 1m. – For General Measuring Purpose – Flexible usage – Easy to use – Cheapest tools 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
3. 3. STEEL RULER Reading : in inches. usually performs in fraction ( eg. 1/8”, 5/16” ) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 Imperial Unit ( Inch )
4. 4. STEEL RULER Reading : in millimetre ( mm ) usually performs with decimal point ( eg. 3.2mm) Metric Unit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
5. 5. ENGINEERS’ STEEL RULES Measuring Linear Dimension 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
6. 6. ENGINEERS’ STEEL RULES ALLOCATION OF POSITION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 Parallelism ?
7. 7. ENGINEERS’ STEEL RULES Internal & External Diameter measure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
8. 8. Engineers’ Steel RulesALLOCATION OF POSITION Diameter ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
9. 9. Engineers’ Steel Rules ALLOCATION OF POSITION Diameter ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
10. 10. ENGINEERS’ STEEL RULESThickness of hair line 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 3 0.1 ~ 0.2 mm Accuracy ?
11. 11. OUTSIDE CALIPERS Solution of measuring the “unmeasurable diameter by a ruler “
12. 12. OUTSIDE CALIPERS Reading taken with a ruler 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
13. 13. OUTSIDE CALIPERSReading taken with a ruler 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
14. 14. OUTSIDE CALIPERS Reading taken with a ruler Diameter 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
15. 15. INSIDE CALIPERS Internal dimension measuring Reading with a ruler 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
16. 16. VERNIER CALIPERS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
17. 17. VERNIER CALIPERS Internal measurement inside jaw Scale depth finder Vernier Depth measurement outside jaw External measurement
18. 18. VERNIER CALIPERSTypical Measuring examples Inside dimension Depth Outside Dimension
19. 19. VERNIER CALIPERSTypical Measuring examples d D y C c x C=X-(d+D)/2
20. 20. VERNIER CALIPERS Typical Measuring examples d D y C x c C=X+(d+D)/2
21. 21. VERNIER READING 49 mm Scale 0 10 20 30 40 50 0 1 2 3 4 5 6 7 8 9 0Vernier 50 dividsions Difference between scale and vernier : 1 - 49 = 1 - 0.98 = 0.02 mm 50
22. 22. VERNIER READING 0 10 Scale Reading = 0 Vernier 0 1 2 Zero point
23. 23. VERNIER READING 0 10 ScaleVernier 0 1 2
24. 24. VERNIER READING 0 10 Scale Reading = 3.2 Vernier 0 1 2 overlap line 0.2
25. 25. VERNIER CALIPERS 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 overlap line
26. 26. VERNIER CALIPERS 20 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 overlap line
27. 27. VERNIER CALIPERS 20 0.58 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 overlap line
28. 28. VERNIER READING ACCURACY length of n divisions Scale 1 n -1 Accuracy = 1 - n Vernier n -1 1 = n n length of (n - 1) divisions
29. 29. VERNIER HEIGHT GAUGE GRADUATED SCALE – Used in connection with a surface table FINE fitted with a carbide ADJUSTMENT tips for marking the SCREW lines on the VERNIER workpiece SCALE CARBIDE TIPPED SCRIBER BASE
30. 30. VERNIER HEIGHT GAUGE
31. 31. VERNIER HEIGHT GAUGE Check Zero Surface Plate
32. 32. VERNIER HEIGHT GAUGE As a Marking tools Set to desire height
33. 33. VERNIER HEIGHT GAUGE
34. 34. VERNIER HEIGHT GAUGE
35. 35. VERNIER HEIGHT GAUGE
36. 36. VERINER HEIGHT GAUGE
37. 37. VERNIER HEIGHT GAUGEAs a measuring tools
38. 38. VERNIER HEIGHT GAUGE
39. 39. VERNIER HEIGHT GAUGEFinding out the heightof workpiece Dimension of workpiece h
40. 40. VERNIER HEIGHT GAUGEFinding out the height of step h = x -y h x y
41. 41. VERNIER HEIGHT GAUGE Finding out the height of hole center C=h-d+D/2 Round Rod ( d ) D C h h-d
42. 42. MICROMETER External Micrometer – used for measuringWorkpiece to be measured external diameter or thickness. Anvil Spindle 5 0 1 2 3 0 Thimble Ratchet Thimble Barrel Frame Lock Nut
43. 43. MIRCOMETER 5 0 1 2 3 0
44. 44. MICROMETER 5 0 1 2 3 0 Pitch = 0.5 mm 5 0 1 2 3 0
45. 45. READING A MICROMETER 5 0 5 0 1 mm ( 2 turns of thimber )
46. 46. READING A MICROMETER 50 dividsions 0.5 each dividsion = 50 = 0.01 mm 5 0 5 0
47. 47. READING A MICROMETER 6.50 5 0 5 0
48. 48. READING A MICROMETER 6.50 0.03 5 0 5 0
49. 49. READING A MICROMETER 6.50 0.03 5 0 5 6.53 0
50. 50. MICROMETERInternal Miicrometer - used to measuring internal diameter or groove 5 0 1 2 3 0
51. 51. DIAL CALIPER GAGECheck Zero point 25 20 30 15 35 10 Dial Caliper Micrometer
52. 52. DIAL CALIPER GAGEChecking Undercut dimension 25 20 30 15 35 10 Workpiece
53. 53. LIMIT GAUGE ( SNAP GAUGE ) Low Limit Upper limit Snap gauge Workpiece
54. 54. LIMIT GAUGE( SNAP GAUGE )
55. 55. LIMIT GAUGE ( SNAP GAUGE ) Dimension is too large to fit requirement
56. 56. LIMIT GAUGE( SNAP GAUGE )
57. 57. LIMIT GAUGE( SNAP GAUGE )
58. 58. LIMIT GAUGE( SNAP GAUGE )
59. 59. LIMIT GAUGE ( SNAP GAUGE )Dimension too small to fit requirement
60. 60. LIMITS GAUGE( SNAP GAUGE )
61. 61. LIMITS GAUGE( SNAP GAUGE )
62. 62. LIMIT GAUGE ( SNAP GAUGE ) Dimension fit to requirement