I am cutting half-blind dovetails using a Porter-Cable 4112 jig and my Hitachi M12v router. I use the bit that came with ithe jig -- quarter-inch shaft. However, this bit keeps slipping out of the collet. After a lot of tinkering and getting the cutting depth to 9/16th of an inch as called for in the jig's instruction, I start cutting dovetails only to find the bit has slipped, exposing more of the bit than called for. I have cleaned the collet and the bit repeatedly. Granted the M12v has a difficult tightening mechanism. I try to get the shaft into the collet as tight as I can only to find when I start cutting that it has loosened and allowed the bit to slip. Wish I could use a bit with a half-inch shaft, but the jig only allows for a quarter-inch shaft. I'm about at my wits' end. Any suggestions? I'm a newbie on this forum and appreciate all criticisms and comments.
Alfred Clem