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) (English Version)

Standard No.: GB/T 20957.2-2007
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 20957.2-2007

Scope: This part specifies the requirements and methods for the geometric accuracy inspection of precision vertical machining centers (ie: vertical Z axis). This part applies to precision vertical machining centers with essentially three numerically controlled axes, i.e. three linear axes (X, Y and Z) up to 2 000 mm, and also applies to additional movements of rams, quills or universal spindle heads , eg: axes of rotation (A´, B´ and C´). This part lists the inspection items for possible additional optional horizontal shafts and two additional universal spindle heads in the appendix: ——Appendix A: Optional horizontal shafts (inspection items AG1~AG6); ——Appendix B: Swing and swing Spindle head with one numerically controlled rotary axis (inspection items BG1~BG2); ——Appendix C: Rotary spindle head with two numerically controlled rotary axes perpendicular to each other (inspection items CG1~CG7). Precision vertical machining centers with a linear axis stroke greater than 2 000 mm can also be used as a reference.

GB/T 20957.2-2007 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

2007 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)