Cara Membaca Jangka Sorong dan Mikrometer Sekrup

Introduction

This tutorial will guide you on how to read a vernier caliper and a screw micrometer, two essential tools for precise measurements in engineering and crafting. Understanding how to use these instruments accurately is crucial for achieving the desired measurements in various projects.

Step 1: Understanding the Vernier Caliper

The vernier caliper is a measuring tool that can measure internal, external diameters, as well as depths.

Components of a Vernier Caliper

• Main Scale: The fixed part of the caliper.
• Vernier Scale: The sliding part that shows the additional measurement.
• Jaw: Used for measuring external dimensions.
• Depth Probe: For measuring depths.

How to Read a Vernier Caliper

1. Zero the Caliper: Ensure the jaws are fully closed, and check if the zero on the main scale and vernier scale align.
2. Take the Measurement:
   • Place the object between the jaws.
   • Slide the vernier scale until it touches the object.
3. Read the Measurement:
   • Note the main scale reading just before the zero of the vernier scale (this is the whole number).
   • Find the line on the vernier scale that aligns with any line on the main scale. This gives you the decimal part of the measurement.
4. Combine the Readings: Add the main scale reading and the vernier scale reading for the total measurement.

Step 2: Understanding the Screw Micrometer

A screw micrometer is a tool used for measuring small dimensions with high precision.

Components of a Screw Micrometer

• Frame: The main body of the micrometer.
• Anvil: The stationary part that holds the object being measured.
• Spindle: The moving part that compresses the object against the anvil.
• Thimble: The part that you rotate to move the spindle.
• Scale: Located on the sleeve and thimble to read measurements.

How to Read a Screw Micrometer

1. Zero the Micrometer: Ensure that the spindle and anvil are touching each other when closed.
2. Place the Object: Insert the object between the anvil and spindle.
3. Tighten the Spindle: Rotate the thimble until it is snug against the object without forcing it.
4. Read the Measurement:
   • Note the reading on the scale of the sleeve (this is the whole number).
   • Look at the thimble scale to see which line aligns with the sleeve scale. This gives you the fractional part.
5. Combine the Readings: Add the sleeve reading and thimble reading for the total measurement.

Tips for Accurate Measurements

• Always ensure your tools are calibrated and clean before use.
• Take multiple measurements to ensure accuracy.
• Be mindful of parallax error when reading scales.

Common Pitfalls to Avoid

• Not zeroing the instruments before taking measurements.
• Applying too much force when using the screw micrometer, which can damage the tool and affect accuracy.
• Misreading the scales, especially if they are not clearly visible.

Conclusion

By following these steps, you can accurately read measurements using both a vernier caliper and a screw micrometer. Mastering these tools will enhance your precision in various projects, whether in engineering, woodworking, or DIY tasks. Next, practice measuring various objects to build confidence in your skills!