Three most common types of mechanical drawings are: Note, detail, and assembly drawing.
- Note drawing
- Do not contain view drawings.
- Detail drawing
- Provide the necessary information for the manufacture of parts.
- Assembly drawing
- Supply the necessary information for assembly.
Commonly standard parts such as washers, nuts and bolts, fittings, bearings, tubing, and many others, may be identified on a note drawing. As the name implies, note drawings often do not contain view drawings. They are usually A4 paper size that contain a written description of the part or standard reference code. In fact, every necessary information and views has come in the standard documents, and we don't want to repeat them. Sometimes inserting a 3D image of part can be useful.
A complete description of the shape of a part is provided by the views, sections and specifications on a detail drawing. A detail drawing shows all the information necessary for fabricating an item, including all dimensioning and tolerancing, the material from which it is made, protective coatings, and processes required to fabricate the end product. Only one item (detail part) shall be presented per drawing.
Assembly drawings are categorized as subassembly or final assembly. Both show the relative positions of parts. They differ only in where they fit in the assembly sequence. Assembly drawings are usually drawn in one of two forms: exploded pictorial view or 2-D sectioned view. Two common elements of assembly drawings are identification balloons and parts lists. The item numbers in the balloons (circles with leaders pointing to individual parts) relate to the numbers in the parts list.
Inseparable assembly drawing
An inseparable assembly drawing represent items which are separately fabricated and are permanently joined together (e.g., welded, brazed, riveted, nailed, bonded, etc.) to form an integral unit (part) not capable of being readily disassembled.
An inseparable assembly drawing may be prepared in place of individual monodetail drawings where the separate parts are of similar materials.
An inseparable assembly drawing shall fully define the end product or detail assembly as assembled. Pieces of the inseparable assembly may be detailed either on separate detail drawings or on the inseparable assembly drawing itself. In the case of weldments, the parts shall not be individually detailed on separate drawings.
ASME Y 14.24
This Standard defines more on types of engineering drawing. It describes typical applications most frequently used to establish engineering requirements:
- Layout Drawing
- Detail Drawing
- Assembly Drawings
- Installation Drawing
- Modifying Drawings
- Arrangement Drawing
- Control Drawings
- Interface Drawing
- Identification Cross Reference Drawing
- Mechanical Schematic Diagram
- Electrical/Electronic Diagrams
- Special Application Drawings
- Drawing Tree