GB/T 4380-1984
Assessment of departure from roundness--Two and three point methods

Be replaced

Standard No.

GB/T 4380-1984

Language

Chinese

Release Date

1984

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Replace By

GB/T 4380-2004

Lastest

GB/T 4380-2004

Scope

This standard specifies a method to determine the roundness error value by two-point and three-point measurement, which is suitable for measuring the roundness error of the inner and outer circular elements of parts. There are differences between the values obtained by two-point and three-point measurement and the actual roundness error value, which must be corrected by the reflection coefficient given in this standard. The standards related to this standard are GB 1183-80 "Terms and Definitions of Shape and Position Tolerance" and GB 1958-80 "Regulations for Testing of Shape and Position Tolerance"

GB/T 4380-1984 history

• 2004 GB/T 4380-2004 Assessment of departure from roundness Two-and three-point methods
• 1984 GB/T 4380-1984 Assessment of departure from roundness--Two and three point methods