Impact Hammer vs Rotary Hammer Drill
I need some clarification on the whole masonary drill thing and am not even sure if I am using the right terminology. I have only ever owned a normal hammer drill but have used SDS rotary impact drills. From what I have read and what I have experienced the SDS rotary drills are far superior. This leaves me with two questions. What is the actual difference in the mechanics of the two types and if SDS is so much better, why do Hitachi, Bosch Makita etc still make high end impact drills, that are in some cases more expensive than the SDS equivalent?