Ignoramus12820 wrote:

I am considering to use a Bosch Colt wood "palm router" (or even a
bigger wood router) as a high speed spindle for milling small detail
on my CNC mill.

I'm inclined to believe that your engraving bit will not load the router near what a
typical router bit for wood would. Build it, check temps in operation, learn how long you
can push it.

Wes