Medicion del cilindro con el alexómetro

How to Measure Wear in a Cylinder

Introduction to Cylinder Wear Measurement

• Leonardo Cañadas, a technical maintenance professor, introduces the topic of measuring wear in a cylinder.

• He explains that two types of wear occur in an engine cylinder: explosion wear and guide support wear, leading to ovalization at the top of the cylinder.

Understanding Ovalization

• The measurement at the top can exceed the longitudinal measurement due to ovalization; typical limits are around 10 hundredths.

• To calculate ovalization, subtract measurements taken at different heights; exceeding 10 thousandths indicates excessive wear requiring rectification.

Tools for Measurement

• Precise measurements must be taken using a tool called an esometer, which accommodates a micrometer with 1-hundredth precision.

• The esometer has fixed probes for various diameters and uses washers for adjustments when measuring cylinders of different sizes.

Practical Application: Measuring Cylinder Wear

• Transitioning from theory to practice, Cañadas demonstrates how to measure wear using calipers and adjusting tools accordingly.

• He emphasizes calibrating the apparatus by first measuring the diameter with calipers before setting it on the micrometer.

Calibration and Adjustment Techniques

• After taking initial measurements, he adjusts the micrometer to zero using calibrated pieces for accuracy.

• Cañadas explains how to set up the mobile contact point on the micrometer while ensuring it is not overly tightened for accurate readings.

Final Steps in Measurement Process

• He discusses balancing measures on both sides of zero during calibration and highlights observing scale movements carefully during measurement.

Measurement Techniques in Cylinder Blocks

Understanding Measurements and Tolerances

• The measurement at height 1 is noted as 74.91 mm, indicating the importance of precision in vertical alignment to avoid deviations.

• The maximum diameter is determined by adjusting the measurement clockwise until it reaches its peak, emphasizing the need for accuracy in cylindrical measurements.

• A tolerance check shows a slight variance from 74.91 mm to 74.90 mm, highlighting that even minor differences (0.01 mm) are significant in validation processes.

• The procedure involves repeating measurements at different heights (height 2), ensuring consistency across various points on the cylinder block.