After years of doing fasteners, do you know why the specifications are 6, 8, 10, 12, 14, 16?
Do you know why the thread specifications are 6, 8, 10, 12, 14, 16?
Do you know why roughness is 0.8, 1.6, 3.2, 6.3, 12.5?
Do you know why the cylinder bore is 63, 80, 100, 125?
Do you know why the cylinder pressure is 6.3, 16, 25, 31.5?
Do you know how many forms of machine design manuals and all the parameter lists on all product samples come from?
Everything comes from great priority numbers.
French engineer Renault saw a wide range of wire ropes on a hot air balloon, and he thought of a way to get 10 5 times, get a number of 1.6, and then toss and multiply, and get 5 priority numbers as follows:
One point six
Two point five
Six point three
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