Calculation of vibration sieve mesh size
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200 mesh means there are 200 holes per square centimeter, according to the standard. 1 centimeter equals 25400 micrometers; therefore, 25400 * 25400 = 64510000 square micrometers. Dividing 64510000 by 200 gives 3225800 square micrometers. The book states that 200 mesh corresponds to 74 micrometers. Where is the mistake in these calculations?
The first step was wrong; it was a conceptual error. The standard specifies that 200 mesh means 200 holes per inch in length.
The holes in your family’s mesh have no edges, right?
You’d better pay more attention and see how to determine it.
The mesh is composed of wires in both horizontal and vertical directions, and the thickness of these wires also takes up space
The center distance between the mesh wire diameters is Pt = 25400/200 = 127 micrometers. Assuming the wire diameter is ds, then the mesh size h = Pt – ds = 74 micrometers ； Therefore, the approximate diameter ds ≈ 127 – 74 = 53 micrometers ； After deducting the frame size of the sieve, the actual wire diameter is approximately 50 micrometers or 0.002 inches.