Universal Tool Microscope Common Measurement Methods
1. Knife-edge method and axial cutting method:
Cutter's mouth method and axial cutting method is a kind of optical and mechanical synthesis method, mainly measuring the axial cutting surface of the thread, this method can also be used to measure the cylindrical, conical and flat specimens, because the adjustment error is very small and is not subject to external influences. For example, the edge is not polished, chamfer cover and so on. The condition for this measurement method is that the specimen should have a smooth, flat measuring surface, and the measuring knife is held against the specimen by hand, which is in contact with the specimen on the measuring plane. For round pieces, this measuring plane is tangent to the axis of rotation, and a thin line parallel to the edge of the cutter indicates the axial cut of the test piece. The fine line is aligned with the reference mark of the angular measuring eyepiece. The edge of the unworn kerf is in contact with the axis of alignment through the crosshairs in the field of view, and the distance from the fine line to the edge of the kerf does not have to be taken into account in the measurement; it is only when the measurement is made with a worn kerf that the error of the kerf is required to be subtracted from the measured value. Here it is necessary to pay attention to: dust and liquid residues on the inspection surface, when checking the position of the kerf according to the light gap, the liquid residues will cause errors. Pad and instrument ** height is matched, can not be adjusted wrongly, cleaned before use.
2, the shadow method:
The shading method is purely optical, it can quickly adjust the instrument to align the specimen contour and compare the shape. This measurement method requires the specimen to be placed in the bottom-up light path, and in the clear range of the alignment microscope, so that the shadow image of the specimen. The image of a round workpiece is a shadow of the outline of the axial plane, while the shadow image of a flat specimen is determined by its edges. Measurement is made by applying a rotating eyepiece and an angular measuring eyepiece with an incised line tangent to the shadow. When comparing the shape of the test piece with the self-drawn figure, you can use a projection device and use binocular observation.
3, reflection method:
Reflective method is also optical contact method, reflective method is characterised by the measurement of edges and markings, such as: scribing, sample punch eye, etc. This method can also be used to rotate the eyepiece of the engraved line graphics to compare the shape. The measurement plane is determined from the clear plane of the microscope. This measurement method is mainly used for flat specimens. Measurement of scribing and sample punching eye with an angle measuring eyepiece, measuring the edge of the hole with a double image eyepiece, compare the shape of the eyepiece with a rotating eyepiece.
4,Microscopic lever method
Micrometric lever method can not be used optically aligned measurement of the measurement surface, for example, holes, a variety of curved surfaces and helical surfaces, where special attention is paid to the relative direction of contact or contact surfaces when the diameter of the measuring head should also be included in the measurement results. For special measurements, it is recommended that suitable contact bars be manufactured. Spherical measuring heads with a certain diameter are used to check rolling curves and pointed measuring heads are used to check spiral surfaces within a certain measuring surface. Knife-edge measuring heads are used to measure tangent surfaces and projections of space curves with only two axes.
