In 2D drawings, we would just pick an edge, or the intersection between the chamfer and the 2D projection plane, and then call out the dimensions and tolerances. Let’s start with the chamfer in Figure 1 as an example. Shafts are primarily constructed of revolved cylinders and cones, so defining them in 3D requires a different approach from 2D drawings. They don’t actually exist on smooth revolved features. In 3D, the intersections between a model and a projection plane provide profile edges to dimension to, but these edges are conceptual and imaginary. These features are easy to define in 2D drawings because they are projected down to a 2D plane. A designer once asked me how to dimension to the tangential or silhouette edges on resolved features such as cylinders and cones. ![]() There is another reason to take on shafts. In this article we’ll explore some key SOLIDWORKS MBD techniques by defining a typical shaft in a gearbox to transmit torques and rotation. However, we can’t leave out shafts when talking about holes, because holes are often designed to support shafts. We shared hole callout tips and tricks at length in the previous three articles: part 1, part 2 and part 3.
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