For the polishing machine, it can be said that it is quite familiar, then how to measure the flatness error of the polished object, how to measure, the following China Polishing Machine suppliers will share with you.
The measurement method of the flatness error can be divided into a direct measurement method and an indirect measurement method. The direct measurement method is to directly compare the measured actual surface to the ideal surface. The linear distance between the measured surface and the ideal surface is the flatness error value of the measured surface. The indirect measurement method is to measure the relative measurement basis of several points on the actual surface. The height difference or tilt angle is used as the raw data and then converted to the flatness error expressed by the line value.
In fact, a small piece of liquid surface can be used as a natural plane of the horizontal plane, but to obtain such a plane, it is necessary to overcome the undulation caused by airflow and vibration and the edge effect caused by surface tension; a stricter working environment.
A common method of flatness measurement is shown in FIG. 2. Figure a is measured with an indicator, the part to be tested is supported on a flat plate, and the three points farthest from the measurement plane are adjusted to be equal to the height of the measuring plate. The surface to be measured is measured at a certain point. The difference between the maximum and minimum readings on the indicator is the flatness error value of the plane.
The flatness error is measured by a flat crystal. The planar crystal is closely attached to the plane to be measured, and the resulting interference fringes are calculated to obtain a flatness error value. This method is suitable for high precision facets.
The level gauge measures the flatness error. Level through the bridge. Place it on the plane to be measured and measure it step by step. Calculate the flatness error value.
Use a self-collimator and mirror to measure and secure the autocollimator to a position outside the plane. The mirror is placed on the plane to be measured. Adjust the autocollimator to be parallel to the surface being measured and measure point by point based on specific points and directions. After calculation, a flatness error value is obtained.
information about china polishing machine : https://www.zhongyun-machine.com