Hi: The fence is removed when you are going to use a template and a cutter with a bearing guide to route material in other than a straight line. The safety pin is used to
provide a solid point to allow the template and material to be cut to get to the bearing
and the cutter. If not used the cutter would have a tendency to pull the template, the material, and possibly your hand through the bit. Hope this helps, Woodnut65
well said woodnut, I'd also like to add that making a quick and dirty bit guard is well worth the effort when working away from the fence. There are a bunch of good books available from your library on router use and safety, all with easy safety devices and jigs. Search the forum topics for 'books' and get some titles.
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