standard tolerance การใช้

• ASTM standard E969 defines the standard tolerance for volumetric transfer pipettes.
• When no other tolerances are provided, the machining industry uses the following "'standard tolerances " ':
• Thick film resistors, when first manufactured, had tolerances of 5 %, but standard tolerances have improved to 2 % or 1 % in the last few decades.
• Typical duct elbow factor of safety should be above 1.6, because it can be difficult to show that shipping out of round for elbows corresponds to the normal 1 % out of round standard tolerance . ( various code and reference notes ).
• Typical main support ring factor of safety, if designed by " Roark " formulas should be 1.6, ( If constructed to the Roark normal 1 % out of round standard tolerance ) because it can be shown by various methods that these formulas are at least a factor of two, above three D duct ring analysis results etc ..