Confusion is a blissful state to live in, isn't it? Anyway - it's common to
use a bearing to perform certain edge treatments like rounding over or
beveling, champhering, etc. No templates involved, just your router in a
table and your wood. Most times the pin comes into play with irregular
shaped pieces that you can't simply run along a fence. The bearing provides
the tracking along the unrouted (is that a word???) part of the edge, just
as you might expect and the pin provides the leverage point against which to
pivot the piece into the router bit.
Well, if you're pattern routing, it's fairly likely it wouldn't be a safety
hazzard for too long - it would probably succomb to the first pass of the
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