maybe I did something wrong. I have hundreds of hours of router usage and have never broken a router. I use Bosch 1617EVS. Both bits broke off the first time they were used correctly. In both cases I milled a fairly soft old pine. Both parts were broken, leaving only a stick with a pointed end. I've never seen this before. I did a few tests walking along the edge of a piece of wood and everything was fine. But I pre-drilled a larger hole and wanted to create a trapped groove.