A three-point internal micrometer is constructed as following parts:
1. Measuring force driving - During the measurement process, in order to obtain accurate readings, a certain measuring force needs to be applied to ensure stable contact between the measuring point and the surface of the workpiece.
2. Thimble - A key component in the three-point internal micrometer, the rotating thimble ensures that the measuring jaw maintains a constant measuring force within the bore being measured, resulting in more accurate readings.
3. Sleeve - The sleeve provides support and positioning for the measuring jaw of the three-point internal micrometer, ensuring that the measuring jaw can accurately and stably contact the inner wall of the hole to be measured.
By connecting sleeves of different lengths, the measuring range of a three-point ID micrometer can be expanded, allowing it to measure larger or deeper bore diameters.
4. Sleeve adjusting screw - By turning the screws, the position, tension or other relevant parameters of the sleeve can be precisely adjusted. Make sure that after adjustment, the sleeve can be stably held in the desired position. It is usually made of high-strength, corrosion-resistant materials to ensure stability and durability for long-term use.
5. Spindle - The spindle is a key component that is connected to three measuring jaws or contact points that rotate or move to drive the measuring jaws to move radially to measure the size of the bore to be measured.
6. Carbide measuring face - It is a measuring surface made of carbide material on a three-point internal micrometer. Carbide materials are usually extremely hard and wear-resistant, and the measuring surface is in direct contact with the object being measured, which allows the measuring surface to maintain its accuracy and finish even in frequent use.
7. Measuring head - The measuring head of a three-point internal micrometer usually consists of three measuring jaws, which are evenly spaced at 120° intervals. This design ensures that the measuring head fits snugly against the bore wall to determine the exact position of the bore axis, allowing for accurate bore measurements.
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