My Hitachi is a few years old so maybe this is a new problem. I have never experienced it. (I usually use 1/2" shank bits but I do have a few 1/4" shafts. When you insert the bits are they a good friction fit in the 1/4" collet, and similarly is the 1/4" collet a reasonable friction fit in the 1/2" collet? Mine are both.dcarriere said:
I am always careful to align the slots and insert bits the full length of the 1/4" collet and the 1/4" collet is fully buried in the 1/2" collet.