Common measurement methods for the universal tool microscope
1. Knife edge method and shaft cutting method:
Knife edge method and axial cutting method are optical and mechanical methods that mainly measure the axial section of threads. This method can also be used to measure cylindrical, conical, and flat specimens because the adjustment error is minimal and not affected by external factors. For example, uneven edges, chamfers covering, and other factors can have an impact. The condition for using this measurement method is that the specimen must have a smooth and straight measuring surface, and the measuring knife should be placed against the specimen by hand, in contact with the specimen on the measuring plane. For circular parts, this measurement plane is tangent to the axis of rotation, and a thin line parallel to the edge of the blade represents the axial section of the specimen. Align the reference line of the eyepiece with the thin line using angle measurement. The edge of the unworn blade is in contact with the alignment axis of the crosshair in the field of view. When measuring, there is no need to consider the distance from the thin line to the edge of the blade. Only when measuring with a worn blade, it is required to subtract the error of the blade from the measurement value. It should be noted that dust and liquid residue on the inspection surface can cause errors when checking the position of the blade based on the light gap. The height of the pad and instrument is pre matched and cannot be adjusted incorrectly. It should be cleaned before use.
2. Shadow method:
Shadow method is a pure optical method that can quickly adjust the instrument to align the contour of the specimen and compare its shape. This measurement method requires the specimen to be placed in a bottom-up optical path and within a clear range of the alignment microscope, in order to obtain a shadow image of the specimen. The shadow image of a circular workpiece is the contour shadow of an axial plane, while the shadow image of a flat specimen is determined by its edges. Measure by using a rotating eyepiece and an angle measuring eyepiece, where the engraved line on the eyepiece is tangent to the shadow. When comparing the shape of the specimen with the self drawn shape, a projection device can be used to observe with both eyes.
3. Reflection method:
Reflection method is also an optical contact method. The characteristic of reflection method is that it can measure edges and marks, such as lines, sample punch eyes, etc. This method can also compare shapes using the engraved line graphics of a rotating eyepiece. The measurement plane is determined based on the clear plane of the microscope, and this measurement method is mainly used for flat specimens. When measuring lines and sample punches, use an angle measuring eyepiece. When measuring the edge of a hole, use a dual image eyepiece. When comparing shapes, use a rotating eyepiece.
4. Micrometer lever method
The micrometer lever method is used for measuring surfaces that cannot be aligned with optical methods, such as holes, various curved surfaces, and helical surfaces. It is particularly important to note that the diameter of the measuring head should also be included in the measurement results when in contact with relative directions or curved surfaces. For special measurements, it is recommended to make suitable contact rods. A spherical measuring head with a certain diameter can be used to check the rolling curve, while a pointed measuring head is used to check the helical surface within a certain measuring surface. The blade shape measuring head is used to measure the projection of cross-sections and spatial curves with only two coordinate axes.,
