On Feb 13, 1:38*pm, mcp6453 wrote:
On 2/13/2010 1:22 PM, ransley wrote:

On Feb 13, 9:03 am, mcp6453 wrote:
I just noticed that Tom Silva is using a battery operated hammer drill
as a driver for screws and lag bolts. He is using this one:

http://bit.ly/cDqNPe

What are the benefits of a hammer drill versus a regular battery
operated driver? When should a hammer be used instead of a regular driver?

*I saw him using a Makita impact driver on a garage door to drive
bolts. Hammer drills have a drill mode for regular drilling or running
screws, a hammer mode for concrete and stone. Hammer drills are
heavier than a drill, impact drivers are a bit lighter compared to a
drill.

That's the episode I saw today, previously recording from DIY. The reason my
curiosity was piqued is that I could hear the impact/hammer action, which caused
me to do the research. The Makita unit on the page I posted is a hammer drill.
In my opinion, based on multiple uses I observed on the TV show, he was driving
screws in the hammer mode, which is why I'm asking the question.

Its not a Hammer mode its impact, Hammer is in and out of the bit,
Impact is a sideways motion-tightening, You dont use a hammer drill in
hammer mode to drive a screw, it wont stay in the screw head, it
bounces.