Hammer drill provides a forward pulsating motion. It's used with masonary
bits, to drill holes in cement. I've done that many times.

Impact driver uses the impact motion in a rotational direction. Helps loosen
rusted on bolts, for example.

Christopher A. Young
Learn more about Jesus
www.lds.org
..

"mcp6453" wrote in message
...


If you were going to buy one tomorrow morning, which one would you buy?
Impact
makes more sense than hammer.