It is easy enough to draw a machining path when the precise dimensions of a piece of work can be read from a plan. It is also relatively straightforward to draw a machining path if you can accurately measure an existing object you want to copy. It's not so easy to copy a shape which is difficult to measure, or where a mating component is impossible to reach. In those cases, some work-arounds may help capture the shape of the object, and a scanner may allow a machining path to be seen and drawn. This can help with some awkward jobs.
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