Tham khảo tài liệu 'standard handbook of machine design p2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | STANDARD HANDBOOK OF MACHINE DESIGN threshold value of the third variable can be estimated to provide a specified reliability. The actual value present in the design or part can then be compared to the threshold value to see if the part meets the desired reliability criteria and is then adequate for the specifications provided. COMMUNICATION OF ENGINEERING INFORMATION The output of an engineering department consists of specifications for a product or a process. Much of the output is in the form of drawings that convey instructions for the manufacturing of components the assembly of components into machines machine installations and maintenance. Additional information is provided by parts lists and written specifications for assembly and testing of the product. Drawing Identification Drawings and machine components are normally identified by number and name for example Part no. 123456 Link. Each organization has its own system of numbering drawings. One system assigns numbers in sequence as drawings are prepared. In this system the digits in the number have no significance for example no. 123456 would be followed by numbers 123457 123458 etc. without regard to the nature of the drawing. A different system of numbering detail drawings consists of digits that define the shape and nominal dimensions. This eases the task of locating an existing part drawing that may serve the purpose and thus reduces the likelihood of multiple drawings of nearly identical parts. The generally preferred method of naming parts assigns a name that describes the nature of the part such as piston shaft fender or wheel assembly. Some organizations add descriptive words following the noun that describes the nature of its part for example Bearing roller or bearing ball Piston brake or piston engine Shaft axle or shaft governor Fender LH or fender RH Wheel assembly idler or wheel assembly drive A long name that describes the first usage of a part or that ties the part to a .
