Chapters 5 to 7 of this standard are mandatory, while the rest are recommended. Please note that certain contents of this standard may involve patents. The issuing authority of this standard shall not be responsible for identifying these patents. Appendix A of this standard is informative. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Special Machining Machine Tools (SAC/TC161). This standard was drafted by the Institute of Special Processing at Hefei University of Technology and the Suzhou Institute of Electric Machining Machine Tools. The main drafters of this standard are Chen Yuanlong, Yu Zhisan, Zhu Shumin, and Fu Chunsen. The clauses in the following documents of this standard have become clauses of this standard through reference. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T2894-1996 Safety Signs GB5226.1-2002 Safety of Machinery - Electrical Equipment of Machinery - Part 1: General Technical Conditions (IEC60204-1:2000, IDT) GB/T12265.1 Safety of Machinery - Safety Distance to Prevent Upper Limbs from Touching Hazardous Areas GB/T14896.1 Terminology of Special Processing Machine Tools - Basic Terminology GB/T14896.3 Terminology of Special Processing Machine Tools - Electrolytic Processing Machine Tools GB/T15706.1-1995 Basic Concepts and Design Rules for Mechanical Safety - Part 1: Basic Terminology Methodology (eqvISO/TR12100-1:1992) GB/T15706.2-1995 Basic concepts and design principles for mechanical safety - Part 2: Technical principles and specifications (eqvISO/TR12100-2; 1992) GB/T16769-1997 Measurement of noise pressure levels of metal cutting machine tools