S01E04 - BELAJAR ALAT UKUR CYLINDER BORE GAUGE

Summary

This educational video, presented through a collaboration between the Directorate of Vocational High Schools and Astra Honda Motor, introduces students to the cylinder bore gauge and its role in automotive measurement. Aimed at vocational high school learners, the lesson explains the tool’s components, functions, assembly, and proper setup using a micrometer. Viewers are guided step-by-step through measuring a motorcycle engine cylinder block, recording deviations, and calculating the final diameter to determine wear, taper, or ovality. Clear demonstrations and practical tips help students understand accurate measurement techniques, reinforcing the importance of precision in engine maintenance and vocational automotive training.

Takeaways

• 🎓 The video is part of a vocational education collaboration between the Directorate of SMK and Astra Honda Motor to improve technical skills among Indonesian vocational students.
• 🛠️ The main focus of the lesson is learning how to use a Cylinder Bore Gauge (CBG) to measure the internal diameter of a motorcycle engine cylinder.
• 📏 A Cylinder Bore Gauge is a mechanical measuring tool used to determine internal diameter, detect wear, taper (conicity), and ovality inside a cylinder.
• 🔍 The main components of a CBG include the dial gauge, grip/rod, measuring point, extension rod, and replacement washer.
• 🧰 Before measuring, all tools such as the CBG, micrometer, vernier caliper, and cylinder block must be cleaned and properly prepared.
• 📐 An initial rough measurement using a vernier caliper is required to estimate the cylinder diameter and select the correct rod and washer combination.
• ⚙️ Proper assembly of the CBG is crucial, including correct placement of the washer and ensuring the dial gauge is securely attached and correctly positioned.
• 🎯 The CBG must be calibrated (zeroed) using a micrometer set to the reference length before performing actual measurements.
• 📊 Measurements are taken at six points (three along the X-axis and three along the Y-axis) to check for taper and ovality within the cylinder.
• ➖ The final cylinder diameter is calculated by subtracting the measured deviation from the reference setting value.
• ✅ If all measurement points show the same deviation, the cylinder has no taper or ovality and is considered to be in good condition.
• 📚 Accurate measurement techniques are essential for determining whether a cylinder is still within standard limits or has experienced wear.

Q & A

What is the purpose of the Cylinder Bore Gauge (CBG) in the automotive industry?

The Cylinder Bore Gauge (CBG) is used to measure the internal diameter of a cylinder in an engine. It helps determine the wear and condition of the cylinder, ensuring the engine is functioning optimally.

What components make up a Cylinder Bore Gauge (CBG)?

A CBG consists of several components, including the gates trip (or shaft), measuring point, ripple and washer, which help in measuring the diameter and inner surface of the cylinder.

How do you determine the correct size of the ripple and washer for a CBG measurement?

The correct size of the ripple and washer is chosen based on the initial rough measurement of the cylinder's diameter. In the example provided, the measurement is 52mm, so a ripple size of 50mm and a washer size of 3mm were selected.

What is the importance of setting the micrometer to zero before using the CBG?

Setting the micrometer to zero ensures that the measurement taken with the CBG is accurate. This zero point serves as a reference for calculating the exact diameter of the cylinder during measurement.

What is the purpose of measuring at multiple points along the X and Y axes of the cylinder?

Measuring at multiple points along the X and Y axes allows for assessing the uniformity of the cylinder's diameter. This helps to identify any ovality or taper in the cylinder, which may indicate wear or other issues.

Why is it important to clean the tools before starting the measurement process?

Cleaning the tools is essential to ensure accurate measurements. Dirt or debris on the tools can interfere with the measurements, leading to incorrect results.

What does it mean if the measurements at all points on the cylinder are the same?

If the measurements are the same at all points, it indicates that the cylinder is perfectly round and has no significant wear or deformation, which means it is in good condition.

What is the role of the ripple and washer in the CBG measurement process?

The ripple and washer are used to increase the contact surface between the CBG and the cylinder being measured. They ensure more accurate readings by adjusting the length of the contact area.

What should you do if the combination of ripple and washer does not match the cylinder's required size?

If the combination of ripple and washer doesn't match, choose a different combination that more closely matches the diameter of the cylinder. It's crucial for accurate measurement.

How do you calculate the final diameter of the cylinder after measurement?

The final diameter is calculated by subtracting the maximum deviation (sag or fluctuation) from the initial reference measurement. This helps to determine if the cylinder has any signs of wear or irregularities.