图纸内容还应包括材料部件编号，间隙公差，表面机械加工符号，热处理信息，表面保护，材料重量，以及其他的必要内容。
Drawings will also include the material part Numbers, tolerances clearances, surface machining symbols, heat treatment information, surface protection, material weight and other necessary information.
采用随机存储器(RAM)寄存刀具编号，实现无刀具编码传感器的加工中心随机换刀控制，是国外近代出现的新技术，并已推广应用。
The random tool change can be controlled with RAM registering tool, Numbers instead of tool encoder. The method is presented in recent years and popularized in application at abroad.
作者承担了此任务，本课题来源于河南省自然科学基金项目“仿形数字化加工技术研究”，编号：004053100。
My dissertation has drawn from the project - the Study of Copying & Digitizing Machining Technology which is sponsored by Natural Science Foundation of Henan province(Item number: 004053100).
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