The assembly drawing is of little use on its own because it needs a list to identify each individual part within the assembly. The individual components making up the vice are numbered using a 'balloon' reference system, i.e., small circles with the part numbers in them. This is an assembly drawing and is not meant to provide any manufacturing details. This has been done by the use of different types of line thicknesses (thick and thin) and different types of line styles (continuous, discontinuous, dash, chain dotted). Although the drawing is 'busy', the different lines help to make the artefact jump out from the page. The movable jaw is actuated by a screw which is rotated by a small bar. The main body of the vice is a stubby 'U' shape in which a movable jaw is positioned between the two uprights. Such a small engineering vice is shown in Figure 3.1. A common artefact in any workshop is a small vice.
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