01b vernier caliper
- 1. Vernier Calipers Chapter 5- Measurement
- 2. Introduction Vernier calipers are tools used in home, small shop, and industrial settings. They are used to make precise length measurements.
- 3. Introduction Some reasons for their popularity include: Wide measuring range (usually 0 - 6”). English and metric scales are usually found on the same instrument. Many different kinds of measurements can be made with a caliper...
- 4. Introduction While both micrometers and calipers can make outside length measurements...
- 5. Introduction Calipers can also make inside measurements...
- 6. Introduction …and also depth measurements.
- 7. Introduction There are three types of calipers. The vernier caliper:
- 8. Introduction The dial caliper:
- 9. Introduction …and the digital electronic caliper.
- 10. Introduction In this lesson, we will concentrate on the vernier caliper since it takes the most skill to read.
- 11. Introduction These are the main features of a typical vernier caliper: Jaws (for outside measurements) Small jaws (for inside measurements)Metric vernier scaleMetric fixed scale English vernier scaleEnglish fixed scale Beam Depth gauge
- 13. Reading a Caliper: metric As you are about to see, working with the metric portion of a vernier caliper is a bit easier to deal with. You only need to make two readings: one from the fixed scale and one from the vernier portion.
- 14. Reading a caliper: metric Start by obtaining a measurement from the fixed scale... This is the fixed scale used for the metric readings.
- 15. Reading a caliper: metric Use the zero line on the vernier to locate your position on the fixed scale.
- 16. Reading a caliper: metric Each number printed on the metric scale represents centimeters. 6 cm However, since your final reading is supposed to be in millimeters, you need view these amounts as millimeters. 7 cm 8 cm 9 cm 10 cmetc.
- 17. Reading a caliper: metric One “trick” is to mentally add a 0 (zero) behind each centimeter number. 0 60 mm 0 0 0 0 70 mm 80 mm90 mm 100 mm
- 18. Reading a caliper: metric Since there are ten spaces between each numbered interval, these smallest spaces must be 1 mm each. For example, note the ten spaces in this interval.The smallest interval on this scale is 1mm. For example, this would be 91 mm... …this is 92 mm... …93 mm etc.
- 19. Reading a caliper: metric As you can see in this problem, we have a fixed scale measurement of 63 mm. The reading is 63 mm since the zero line has gone just beyond the 63 mm mark, but hasn’t reached the 64 mm mark.
- 20. Reading a caliper: metric To finish we must obtain a reading from the metric vernier scale. On this scale, each line represents 0.05 mm. .05 mm.10 mm.15 mm.20 mm.25 mm.30 mm.35 mmetc.
- 21. Reading a caliper: metric Just as we did on the English vernier scale, we need to look for a place where a line from the fixed scale “lines up” with a line on the vernier.It appears that these two lines, “line up” the best. This is read as .50 mm
- 22. Reading a caliper: metric So based upon the two readings (one from the fixed scale, and one from the ruler) the length must be 63 mm + .50 mm = 63.50 mm 63 mm .50 mm+ 63.50 mm
- 23. Example 2
- 24. Reading a caliper: metric Let’s try another one for practice.
- 25. Reading a caliper: metric First take a reading from the fixed scale. Use the zero line from the vernier to help. Remember that we need to read the fixed scale in terms of millimeters. The zero line is close, but not quite up to the 20 mm line. It has gone beyond the 19 mm line however. 19 mm 0 0 0
- 26. 19 mm Reading a caliper: metric To finish, read the vernier scale.It appears that these two lines, “line up” the best. This is read as .35 mm .35 mm
- 27. 19 mm Reading a caliper: metric The final reading then is 19.35 mm. .35 mm+ 19.35 mm
- 28. Reading a caliper: metric Let’s go through one more example.
- 29. Quiz # 01 • Write in mm. 1. Least count 2. Fixed scale reading 3. Vernier scale reading 4. Total reading • Write at least 4 fire safety precautions for workshops