Telecurso 2000 - Metrologia - 05 Leitura no Sistema Métrico

Understanding the Use of a Caliper

Introduction to Calipers

• The lesson focuses on learning how to read and interpret measurements using a caliper, emphasizing the importance of understanding metric readings.

• The goal is for students to become proficient in reading measurements from a caliper, which is essential for accurate measurement interpretation.

Reading Measurements

• Initial guidance on how to read measurements involves careful observation of the scale and its divisions; sensitivity of the instrument is highlighted.

• Students are reminded that the number of divisions on the auxiliary scale determines resolution, which indicates the smallest measure that can be accurately read.

Practical Application

• A practical example is provided where students will practice reading measurements with a caliper featuring ten divisions.

• An example illustrates how to combine readings from both fixed and sliding scales to achieve an accurate final measurement.

Practice Exercises

• Students engage in exercises where they randomly select measures, reinforcing their ability to calculate total measurements by adding fixed and decimal values.

• Further examples demonstrate how different readings correspond with specific decimal values, enhancing comprehension through practice.

Advanced Measurement Techniques

• Discussion shifts towards more complex scenarios involving calipers with 20 divisions, showcasing how these instruments provide finer resolutions.

• Students learn about interpreting readings when using advanced features like vernier scales, which require additional attention during measurement.

Conclusion and Summary

• The session concludes with a recap of key concepts learned about reading various types of calipers and their respective scales.

Reading Measurements with Scales

Understanding Measurement Readings

• The diameter reading before zero is 68 millimeters on the fixed scale, and attention is needed to find the correct mark that aligns with the fixed scale.

• The final reading combines 68 millimeters and an additional 32 hundredths of a millimeter, resulting in a total of 68.32 mm.

• Each mark on the scale represents two hundredths; thus, a reading of 17.56 mm is confirmed based on the third mark after zero.

• A new measurement shows 40 mm before zero, with the corresponding mark being four divisions after it, leading to a final reading of 40.48 mm.

• Emphasizes practice in reading measurements using metric systems to avoid forgetting techniques learned.

Detailed Measurement Techniques

• For another measurement, three millimeters are read correctly as indicated by the seventh division coinciding with the fixed scale.

• In this instance, readings show that before zero there’s a ten-mark indication while aligning with thirty-five hundredths for accuracy.

• The first measure indicates fifteen mm and two hundredths as correct; another measure reads ninety-three mm and forty-eight hundredths accurately.

• A final measurement reveals fifty-five mm and fifty-two hundredths as accurate based on previous markings observed.

• Reinforces learning outcomes from today’s session about interpreting scales in various divisions effectively.

Review and Practice

• Summarizes key learnings: how to read measurements in millimeters across different scales (nono with ten divisions, twenty divisions, etc.).