Ten routers? Nice.
In any case... I would just get the virgin base mounted with the
mounting holes however you can do it.
Cut a center hole through the center on the base with a 1/4 or 1/2"
Remove base (or leave it mounted and use one of you other ten routers in
Use a centering bit or 1/4 or 1/2" stock as a guide pin to spin the base
(mounted or unmounted) to cut a perfect circle.
"Playing is not something I do at night, it's my function in life"
For use with guide bushings I don't care if the hole is perfectly
centered on the base....I care that the hole is perfectly concentric
with the bit. By making the hole with a bit in the router, you get that
One possibility would be to use a trammel bar of the same radius as the
base plate. This gets attached to some bar stock that is chucked up in
the collet and threaded internally. When the edge of the trammel bar is
aligned with the edge of the base plate all the way around, you're centered.
If you get close when drilling your holes through the base and use
pan-head screws, you'll have a bit of wiggle room to get it perfectly
To make a base plate to match an existing router, I used a dowel pin
target router, and a matching-diameter carbide bit in the primary
With a raw phenolic plate attached to the target with three flathead
in countersinked holes (which is self-centering after remounting), I
used the target router to drill a center hole, then chucked the steel
dowel in the target and routed the edge of the plate with the primary
router, with the dowel as my guide. I did a rough cut with a bit of
brass tube over the dowel, then removed that tube and made the finish
Hmmm. If I chucked the dowel in a holesaw's pilot, maybe I could
make a stepped hole in the base suitable for router guides?
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