Sanfeng three-point inner diameter 468 model maintenance

Sanfeng three-point inner diameter 468 model maintenance

1. Product Overview Product Name: Sanfeng Three Point Inside Micrometer Model: 468 Series Manufacturer: Sanfeng Co., Ltd. Main Application: Used for high-precision measurement of internal dimensions such as inner diameter and groove width of holes, especially for detecting roundness errors of holes. Core feature: By contacting the hole wall with three accurately distributed measuring heads, measurement deviation caused by tool inclination or hole shape errors (such as ellipticity) can be eliminated, ensuring the accuracy and reliability of measurement results. two The core design features and working principle of the three-point contact design (named after it) are different from ordinary two-point internal micrometers or calipers. The 468 model has three measuring anvils: a fixed measuring anvil located at the top of the ruler body. A movable anvil: driven by a differential cylinder to undergo major dimensional changes. An auxiliary support point: opposite the fixed anvil, provide a stable third point support. These three points are evenly distributed at 120 degrees on a cross-section. When placed in the tested hole, these three points will automatically search for the "hole center" to ensure that the measurement axis passes through the diameter direction of the hole, thus measuring the true diameter rather than a random chord length. Working principle: Under the action of spring force, the three measuring heads are always tightly attached to the hole wall, forcing the measuring axis of the measuring tool to automatically remain parallel to the axis of the hole (or pass through the center of the circle), achieving automatic centering. Eliminating errors: Eliminating tilt errors: Even if the user holds it slightly tilted, the three-point design can ensure that the measured diameter is the minimum diameter (i.e. true diameter) on the section. Detecting roundness: By measuring multiple times at different depths and directions of the hole, it is possible to effectively determine whether there are roundness errors such as ellipticity in the hole. If there is a significant difference in the values measured in different directions using a two-point measuring tool, it indicates that the hole is not round; And the three-point equation can more stably reflect the true diameter. three The main technical parameters (taking common models as examples) of the Sanfeng 468 series come in multiple specifications to cover different measurement ranges. Model example, measurement range, division value, accuracy, probe length 468-312 12-15 mm 0.001mm ± 2 μ m standard 468-315 15-20 mm 0.001mm ± 2 μ m standard 468-325 25-30 mm 0.001mm ± 2 μ m standard .. . .. . .. . .. . 468-350 50-60 mm 0.001mm ± 3 μ m standard note: There are many specifications: the 468 series usually covers from a few millimeters to over a hundred millimeters, but different models need to be selected according to different ranges. Accuracy: Accuracy may vary slightly with the increase of measurement range, please refer to the corresponding model manual for details. Optional attachment: Provides extension rods of different lengths for measuring deeper holes. four The Sanfeng 468 three-point inside diameter micrometer is widely used in all occasions that require high-precision inside diameter measurement: in the machining workshop, it is used to inspect the hole diameter after machining, milling, boring, and drilling. Quality Control (QC) Department: Conduct precise inspections on finished or semi-finished products. Mold industry: measuring mold cavities, guide column holes, etc. Automotive manufacturing industry: measuring precision holes on engine cylinder blocks and gearbox housings. Aerospace industry: measuring the inner holes of various high-precision components. five Advantages and Value: High precision and high repeatability: The three-point centering design ensures measurement accuracy and stability. Can detect roundness: It is an important tool for determining the roundness of holes. Easy to operate: Compared to the inner diameter gauge, it has a direct reading and does not require calibration of the ring gauge, making it faster to use. Intuitive reading: The differential cylinder reading method, similar to the external micrometer, is convenient and easy to read. Reliable quality: The Sanfeng brand guarantees the stability of its materials, manufacturing processes, and long-term use. six Precautions for use: Clean the anvil and the surface of the workpiece before use. Calibration: Before use, use a standard ring gauge or gauge block attachment to perform zero calibration. Measurement force: When measuring, gently rotate the differential cylinder ratchet until it makes a "click" sound (indicating that the standard measurement force has been reached), and do not apply too much force. Finding the minimum diameter: Slightly swing the measuring tool inside the hole to find the turning point (minimum value) of the differential cylinder reading, which is the true diameter of the section. Multi section measurement: In order to comprehensively evaluate a hole, measurements should be taken at multiple sections such as the inlet, middle, and outlet of the hole, and verified in two directions perpendicular to each other at each section. Maintenance: Clean and apply rust proof oil after use, and store in a dedicated box. The Sanfeng 468 series three-point inside micrometer is a classic and professional measuring tool. It solves the problem of centering and roundness judgment in inner diameter measurement through a unique three-point structure, and is a "weapon" in the fields of precision manufacturing and quality control. If your work involves high-precision aperture detection, this tool is undoubtedly a trustworthy choice. If you have specific measurement range requirements, I can help you find more accurate model parameters.

   Sanfeng three-point inner diameter 468 model maintenance