Twice recently I've had a 1/4" upcut bit slip down in the collet of my porter cable router while making a profile pass. The material is hardwood and I'm cutting .030" off in one pass at a depth of .735". Speed is 50 ipm. I decided to throw away the collet and have ordered some of the ER collets from PreciseBits.com. Now to my question: Will the new ER collets hold the upcut bit tight enough to keep this from happening, or should I also switch to downcut bits. I prefer upcut because I use carbide end mills that are reasonably priced compared to the downcut router bits.
Thanks,
Charlie