Hidden lines indicate the edge is behind a face.
Visible lines indicate an edge is visible in relevant view.Understand the difference between the visible lines, hidden lines and phantom lines.Drawings could be part of series and hence the entire series should be present in order to be able to translate the information. Make sure you have at hand all the relevant pages for the assembly drawings.The BOM is usually tabulated on the first page. The bill of materials is a list of the components and the quantity that makes up the general assembly. Any information in the notes that conflict with the title block should be considered as the correct information hence the notes will in all instances, supersede the title block information. The next step is to read the notes in the drawing (outside the title block).Status of the drawing (Preliminary, Approved, etc.).The details should give you the following information This information is regarded as the context in which the drawing should be perceived. Always start with reading the details in the title block.Before progressing, my suggestion is to have a drawing handy whilst going through below process. The key to reading the drawings, elaborate or vague, is to follow a simple process that relies on the many similarities of most drawing. This article aims to empower the inexperienced readers with some tools to be able to read most General Assembly drawings whilst diverting the assumptions to those with the technical background in the field. Personally I don’t like making assumptions and will tend to over define the drawing for the sake of clarity and leave little to chance. The difference between the two dwells in the assumed technical knowledge of the audience and the amount of time required to decipher the “code”.
Nevertheless all the drawings have conveyed enough information to be able to carry out manufacturing or assembly of the finished product. The latter is obviously a drawing that details little information and leaves much to assumption. In my years of mechanical design I have encountered a vast array of drawings that have both conveyed an elaborate understanding of the assembly or led me on a journey into the fires of Mount Doom.
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