I've a feeling this is a groan type question but anyway. what *is* the
difference between an impact driver and a hammer drill?
I have a (cheap) hammer drill that's fine for driving wordscrews of
various flavours and drilling holes (ie can use screwdriver bits and
twist drills). It has a setting for "hammer" that I *guess* may be for
use with the old-fashions Masonmaster bits for drilling concrete/brick
etc. I never use that now as I have an SDS frill which does that.
That's a kind if "impact" setting isn't it?
So, does an impact driver also drill holes :-) Seriously though folks
what is it used for (as they seem quite expensive). What can I do with
an impact that the hammer drill does not do.
With a hammer or percussion drill the impacts are along the axis of the
bit (i.e. in and out). With an impact driver the impacts are angular
around the rotation axis of the bit.
Ordinary hammer drills:
Yup, ordinary hammer drills need masonry bits (or multi-material ones)
when in hammer mode.
SDS require special SDS masonry bits.
Details of the various types here:
It can, but is not ideal in most cases. You need either an adaptor chuck
for it, or hex shanked bits.
See the faq above. However in summary - if you put in lots of screws,
you will find an impact driver a very fast and easy way to do it.
The makers have a great deal to answer for - Bosch call some of their
hammer drills impact ones. And an impact driver was a special type of
screwdriver you hit with a hammer to turn kinetic energy into rotary
motion long before these cordless impact driver arrived - I have one which
is 40 years old.
FWIW, impact is good for smaller screws too - less effort to stop the
drill turning. So less tiring if used a lot.
*Pentium wise, pen and paper foolish *
Dave Plowman firstname.lastname@example.org London SW
It is for drilling masonry. The drill is hammered in and out, like the SDS
but on a much smaller scale. Better than just rotary drilling, but nothing
like as good as an SDS.
SDS Frill :-)
They don't really do holes. The bit is hammered round and round, not in &
out. Will put in a 4" coach screw, no pilot hole, in around 4 secs. Worth
the money if putting in lots of big screws.
So, an SDS is a big improvement over a hammer drill when drilling & an
impact driver is a big improvement over a drill driver when screw driving -
especially with big screws.
Dave - The Medway Handyman
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