Assembly drawings Flóra Hajdu B406 hajdfl@sze.hu

Content Working drawings Assembly drawings Examples 2019.07.03. Hajdu Flóra

Drawing quality assurance Requirements of engineering drawings: Be complete, clear and accurate Conform to standards Ensure proper operation Responsibility: Drafter Checker Specialist assigned to review the drawing 2019.07.03. Hajdu Flóra

Working drawings Working drawing Assembly drawing Detail drawing The term drawing refers to the description of details, assemblies, installations or other types of graphical representations A working drawing is a drawing that supplies information and instructions for the manufacture or construction of machines and structures Working drawing Detail drawing Assembly drawing Provides the necessary information for the manufacture of parts Supply necessary information for assembly of parts 2019.07.03. Hajdu Flóra

Detail drawing requirement Shape description: pictorial, ortographic views, sectional views, auxiliary views, detailed views Size description: dimensions, tolerances Specifications: general notes, material, heat treatment, surface finish, general tolerances, number required Additional drawing informations: drawing number, scale, method of projection, date, name of part, drafter’s name 2019.07.03. Hajdu Flóra

Example of detail drawing Views Dimensions Tolerances Surface finish

Assembly drawings All machines and mechanisms are composed of numerous parts A drawing showing the product in its completed state is called an assembly drawing Assembly drawings vary greatly in the amount and type of information given, depending on the nature of the machine or mechanism depicted 2019.07.03. Hajdu Flóra

Assembly drawings Primary functions: Show the product in its completed shape Indicate the relationship of its various components Designate these components by a part or detail number Other information: overall dimensions, capacity dimensions, relationship dimensions between parts, operating instructions, data on design characteristics 2019.07.03. Hajdu Flóra

Types of assembly drawings Design assembly drawing Installation Assembly drawing Assembly drawings for catalogs Item list (Bill of materials – BOM) Exploded assembly drawings Detail assembly drawings Subassembly drawings ábra Source: C. Jensen, J. D. Helsel, D. R. Short: Engineering Drawing&Design 2019.07.03. Hajdu Flóra

Design assembly drawings When a machine is designed an assembly drawing or a design layout is first drawn to clearly visualize the performance, shape and clearances of various parts From this assembly drawing the detail drawings are made and each part is given a part number The part number is attached to the corresponding part with a leader 2019.07.03. Hajdu Flóra

Item list (BOM) Itemized list of all the components shown on an assembly drawing or detail drawing Often an item list is placed on a separate sheet for ease of handling and duplicating The item list is used by the purchasing department to order the necessary material for the design – it shows the raw material size of the part Standard components (bolts, nuts, bearings), which are purchased rather than fabricated should have a part number. Information in the descriptive column should be suifficient for purchasing 2019.07.03. Hajdu Flóra

Subassembly drawings Many completely assembled items are assembled with many preassembled components as well as individual parts These preassembled units are referred to as subassemblies (e.g. transmission for a vehicle) Subassemblies are designed to simplify final assembly and to permit the item to be either assembled in a more suitable area or purchased from an outside source 2019.07.03. Hajdu Flóra

Assembly drawing example (bearing shaft with gear- CAD) 2019.07.03. Hajdu Flóra

Assembly drawing example (bearing shaft with gear) 2019.07.03. Hajdu Flóra

Assembly drawing example (clutch)

Assembly drawing example (clutch)

Assembly drawing example (clutch)

Detail drawing of a clutch plate Views Dimensions Tolerances Surface finish

Summary Assembly drawings Next week: geometric tolerance

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