Rick wrote:
I am looking for a LONG straight router cutter, to cut a grove in a
piece of oak.

You are a druid AICMFFMOM


I am cutting a rebate for a door, into a lintel. We have cut the
lintel out of an oak branch, so the bottom still has the bark on it.
The curved shape has ment a good bit of material has to be accuratly
removed. The current attack plan is to cut the edge of the hole with
the router, and then hack out the middle with a chizel.

Can't you use a circular saw?