DanG wrote in :

On 1/29/2012 9:09 PM, mcp6453 wrote:
Often on Holmes Inspection and This Old House, the workers use what
appear to be hammer drills as electric screwdrivers, particularly for
lag bolts or long screws. Are they really using hammer drills, or
does it just sound like a hammer drill?


Impact driver. Yes, I suppose it is a bit like a hammer drill. I've
not torn mine apart yet to see what is impacting, but they sure make
Tapcons, lags, and Phillips screws work wonders.

Here is some information: type "impact driver" in google. These
things are all the rage, but it would be the first tool I would
replace if lost or dead.



A "hammer" drill strikes the bit axially while rotating the bit,while an
impact driver has only rotational strikes on the bit.

--
Jim Yanik
jyanik
at
localnet
dot com