JB/T 8801-1998 This standard is based on the structural characteristics and usage requirements of machining centers, and GB 9061-88 "General Technical Conditions for Metal Cutting Machine Tools", ZBn J50 008.1-88 "General Technical Conditions for Machined Parts of Metal Cutting Machine Tools" and ZBn Specification and supplement of standards such as J50 008.3-88 "General Technical Conditions for Assembly of Metal Cutting Machine Tools". This standard specifies the requirements for manufacturing and acceptance of general precision machining centers. This standard applies to ordinary precision machining centers with linear axis strokes up to 2000mm.