GB/T 20957.4-2007
Test conditions for precision machining centres.Part 4:Accuracy and repeatability of positioning of linear and rotary axes (English Version)

Standard No.: GB/T 20957.4-2007
Language: Chinese, Available in English version
Release Date: 2007
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 20957.4-2007

Scope: This part specifies the tolerances for the inspection of the positioning accuracy of the linear axis and the rotary axis of the precision machining center. This section applies to precision machining centers with linear axis strokes up to 2 000 mm and rotary axis strokes up to 360°. Precision machining centers with a linear axis stroke greater than 2 000 mm can also be used as a reference.

GB/T 20957.4-2007 Referenced Document

GB/T 17421.1-1998 Test code for machine tools. Part 1: Geometric accuracy of machines operating under no-load or finishing conditions
GB/T 17421.2-2000 Test code for machine tools-Part 2:Determination of accuracy and repeatability of positioning numerically controlled axes
GB/T 20957.1-2007 Test conditions for precision machining centres.Part 1:Geometric tests for machines with horizontal spindle and with accessory heads(horizontal Z axis)
GB/T 20957.2-2007 Test conditions for machining centres.Part 2:Geometric tests for machines with vertical spindke or universal heads with vertical primary rotary axis(vertical Z-axis)

2007 GB/T 20957.4-2007 Test conditions for precision machining centres.Part 4:Accuracy and repeatability of positioning of linear and rotary axes