I recently developed a wood vase which uses a metal flower vase insert.
I have tried spur tooth bits and forstener bits for drilling the insert hole and have found that using a Freud Carbide Forstner cutter gives me the best overall cut quality with the least amount of cleanup required.
Planetor bits have been suggested, but I found that the company which made them has been bought out by someone not interested in continuing to make them.
I am using a wide variety of woods.
Anyone else have any experiences to share?
George