What is the reading method of a cylinder gauge?
2 Answers
Taking the cylinder gauge as an example, the mnemonic for its reading method is 'add clockwise, subtract counterclockwise': (1) When the pointer's index rotates clockwise, the reading should be added to the original zero calibration base. (2) When the pointer's index rotates counterclockwise, the reading should be subtracted from the original zero calibration base. Here is more information about the cylinder gauge: 1. Precautions: The default cylinder diameter can only increase; do not observe the changes of the small pointer. If the extension rod is too long, the cylinder gauge may get stuck in the cylinder and cannot measure; or if it is too short, the movable measuring head may not contact the cylinder wall at all, causing the dial indicator to remain stationary and unable to measure. 2. Brief description: The internal dial gauge, also known as the cylinder gauge, is a comparative measuring tool used for measuring bore diameters.
When I first used a dial bore gauge, I found the reading method quite intuitive. The first step is to zero the gauge, which is essential because it ensures the measurement starting point is accurate. During operation, gently insert the gauge probe into the cylinder wall and select measurement points at different positions, such as the upper, middle, and lower sections. At each point, lightly push the piston to ensure good contact with the gauge probe. The reading relies on the scales of the main and auxiliary rulers—the main ruler displays the integer millimeter value, while the auxiliary ruler provides micrometer-level fine adjustments. Combining these gives the actual bore size. The key is to take multiple measurements at different points and directions to check if the roundness deviation is excessive, as excessive cylinder wear can affect engine efficiency. When I first started, I often forgot to calibrate the zero position, resulting in inaccurate data. Later, I developed a habit: always check if the tool is stable before each measurement.
