DIYbanter - View Single Post

In article . com,
says...
I see these in the Screwfix catalogue, Impact Drivers. Anyone know what
that is? Does the drill hammer? Is it just a drill/driver without a
chuck? What is the advantage?

It's the equivalent of hitting a spanner with a hammer to shock a
fitting loose (or tight). When the nut/bolt is loose it spins to drive
it, when it's tight it hammers. You've probably seen an air-powered
version being used in KwikFit. The manual version is used with a hammer
- when you hit it on the end some of the force drives the bit against
the screwhead and some is converted to rotation to turn the screw
slightly.

Also, Drywall Drivers, also in Screwfix,
what do they do over a drill/driver? If a tool can save me time, effort
and produces a better quality job, then I am always interested.

Drywall drivers have a depth stop that activates a clutch so you can't
drive screws too far and split the paper facing on plasterboard. The
cheapo version is just a bit with a fixed collar that makes it slip out
of the screw head at a certain depth.