Week 2 benchwork measurement
- 1. Measurement, Marking out & Fitting Practice
- 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. 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. 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. 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. 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. 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. 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
- 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. ENGINEERS’ STEEL RULES Thickness 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. OUTSIDE CALIPERS Solution of measuring the “unmeasurable diameter by a ruler “
- 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. 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
- 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. 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. VERNIER CALIPERS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6
- 17. VERNIER CALIPERS Internal measurement inside jaw Scale depth finder Vernier Depth measurement outside jaw External measurement
- 18. VERNIER CALIPERS Typical Measuring examples Inside dimension Depth Outside Dimension
- 19. VERNIER CALIPERS Typical Measuring examples d D y C c x C=X-(d+D)/2
- 20. VERNIER CALIPERS Typical Measuring examples d D y C x c C=X+(d+D)/2
- 21. VERNIER READING 49 mm Scale 0 10 20 30 40 50 0 1 2 3 4 5 6 7 8 9 0 Vernier 50 dividsions Difference between scale and vernier : 1 - 49 = 1 - 0.98 = 0.02 mm 50
- 22. VERNIER READING 0 10 Scale Reading = 0 Vernier 0 1 2 Zero point
- 23. VERNIER READING 0 10 Scale Vernier 0 1 2
- 24. VERNIER READING 0 10 Scale Reading = 3.2 Vernier 0 1 2 overlap line 0.2
- 25. VERNIER CALIPERS 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 overlap line
- 26. VERNIER CALIPERS 20 20 30 40 50 60 0 1 2 3 4 5 6 7 8 9 10 overlap line
- 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. 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. 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
- 31. VERNIER HEIGHT GAUGE Check Zero Surface Plate
- 32. VERNIER HEIGHT GAUGE As a Marking tools Set to desire height
- 37. VERNIER HEIGHT GAUGE As a measuring tools
- 39. VERNIER HEIGHT GAUGE Finding out the height of workpiece Dimension of workpiece h
- 40. VERNIER HEIGHT GAUGE Finding out the height of step h = x -y h x y
- 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. MICROMETER External Micrometer – used for measuring Workpiece to be measured external diameter or thickness. Anvil Spindle 5 0 1 2 3 0 Thimble Ratchet Thimble Barrel Frame Lock Nut
- 43. MIRCOMETER 5 0 1 2 3 0
- 44. MICROMETER 5 0 1 2 3 0 Pitch = 0.5 mm 5 0 1 2 3 0
- 45. READING A MICROMETER 5 0 5 0 1 mm ( 2 turns of thimber )
- 46. READING A MICROMETER 50 dividsions 0.5 each dividsion = 50 = 0.01 mm 5 0 5 0
- 47. READING A MICROMETER 6.50 5 0 5 0
- 48. READING A MICROMETER 6.50 0.03 5 0 5 0
- 49. READING A MICROMETER 6.50 0.03 5 0 5 6.53 0
- 50. MICROMETER Internal Miicrometer - used to measuring internal diameter or groove 5 0 1 2 3 0
- 51. DIAL CALIPER GAGE Check Zero point 25 20 30 15 35 10 Dial Caliper Micrometer
- 52. DIAL CALIPER GAGE Checking Undercut dimension 25 20 30 15 35 10 Workpiece
- 53. LIMIT GAUGE ( SNAP GAUGE ) Low Limit Upper limit Snap gauge Workpiece
- 54. LIMIT GAUGE ( SNAP GAUGE )
- 55. LIMIT GAUGE ( SNAP GAUGE ) Dimension is too large to fit requirement
- 56. LIMIT GAUGE ( SNAP GAUGE )
- 57. LIMIT GAUGE ( SNAP GAUGE )
- 58. LIMIT GAUGE ( SNAP GAUGE )
- 59. LIMIT GAUGE ( SNAP GAUGE ) Dimension too small to fit requirement
- 60. LIMITS GAUGE ( SNAP GAUGE )
- 61. LIMITS GAUGE ( SNAP GAUGE )
- 62. LIMIT GAUGE ( SNAP GAUGE ) Dimension fit to requirement