high accuracy tools
TRANSCRIPT
- 1.High Accuracy Measuring Devices A. Vernier CaliperB.
Microcaliper
2. A. Vernier Caliper
The Parts of Vernier Caliper
3. Inside jaws: Internal length (diameter) measurements are found
by using this part.
4. Locking screw: blocks the instrument's movable parts.
5. Upper Scales: Vernier scale (inch) Rail (inch)
6. Lower Scales: Vernier scale (mm) Rail (mm)
7. Depth probe: The part used in order to find depth measurements
Front end of the rail
8. Depth probe: The part used in order to find depth measurements
Front end of the rail
9. 1. Inside jaws: Internal length measurements are found by using
this part. 2. locking screw: This part blocks the instrument's
movable parts in order to transfer between measurement methods
easily.3. Vernier scale (inch)4. Rail (inch) 5. Depth probe: The
part used in order to find depth measurements6. Front end of the
rail7. Main scale (mm) 8. Vernier scale (mm) 9. Sliding Jaw10.
Outside jaws: This part makes measuring external lengths
possible.11. Fixed Jaw
10. Reading the
Vernier Caliper
11. 1) Read the cm mark on the fixed scale to the left of the
0-mark on the vernier scale. (1 cm or 10mm on the fixed
caliper)
12. 2. Find the mm mark on the fixed scale that is just to the left
of the 0-mark on the vernier scale. (6mm or 0.6 cm on the fixed
caliper)
13. 3. Look along the 20 marks on the vernier scale and the mm
marks on the fixed scale, until you find the two that most nearly
line up. (0.25mm on the vernier scale)
14. 4. To get the correct reading, simply add this found digit to
your previous reading. (10mm + 6mm + 0.25mm= 16.25 mm)
15. 16. 23.7 mm or 2.37 cm
17. 18. 10.2 mm or 1.02 cm
19. 20. 31.5 mm or 3.15 cm
21. 22. 9.1 mm or 0.91 cm
23. 24. 26.0 mm or 2.60 cm
25. 26. 756.5 mmor
75.65 cm
27. 28. 756.8 mmor
75.68 cm
29. 30. Using the
Micrometer
Place the object whose length, diameter, or thickness is to be
measured between the micrometer's measuring rods.
31. Using the
Micrometer
2. Turn the thimbleuntil the spindlecontactsthe object to be
measured. The rods should lightly touch the object between them but
not clamp down on it.
32. Using the
Micrometer
3. To apply a consistent pressure to the object, use the ratchet
stop.
33. Using the
Micrometer
4. Flip the locking lever to lock the measuring rods in
place.
34. Using the
Micrometer
5. Flip the locking lever to lock the measuring rods in
place.
35. 1. The mm marks are above the horizontal line and the half-mm
marks are below it.
36. 4.5 mm
2. Read the value just exposed by the thimble on the central line
of the cylinder. This value is in millimeters.
37. 4.5 mm
0.13 mm
3. Read the mark on the thimble aligned with the horizontal line on
the barrel. This mark is in hundredths of millimeters.
38. 4.5 mm
0.13 mm
4. There are 50 such marks, each turn of the thimble corresponds to
half a millimeter (the distance between the upward and downward
marks on the cylinder central line).
39. 4.5 mm
0.13 mm
5. Add these values together. This is the measurement of the object
between the measuring rods.
40. 4.5 mm
0.13 mm
4.5 mm + 0.13 mm = 4.63 mm
41. 5.5 mm
0.17 mm
5.5 mm + 0.17 mm = 5.67 mm
42. 3.5 mm
0.17 mm
3.5 mm + 0.17 mm = 3.67 mm
43. 4.5 mm
0.17 mm
4.5 mm + 0.17 mm = 4.67 mm
44. 18.5 mm + 0.40 mm = 18.90 mm