Its nearly Christmas. I don't have an impact driver and have apparently not
needed one up to now. I have an electric screwdriver. I also have a hammer.
Do I need an impact driver ?
If so, why do I need one ?
Could I use the electric drill with hammer mode on and a drillbit in ?
The reasons do not have to be all that convincing.
You want one.
No - hammer drill works in-line with the drill bit. An impact driver
works by hammering in rotation.
Huge advantage of impact drivers is the extremely low reaction - so they
are easy to use in awkward places, at then end of an outstretched arm,
I find being able to use both a drill (or electric screwdriver) and an
impact driver is very convenient - simply by reducing bit-swapping.
Impact drivers can be very good at removing screws with partially
graunched heads - if you are lucky, it will manage to catch and undo the
screw in a way not possible with anything else. But no guarantees.
If I were doing a big project with lots of screws - like decking -
impact driver would be on my essential list.
You obviously fancy one - and a little bit of what you fancy does you good!
Having said that, I've managed without one for 70 years. Maybe I don't
know what I've been missing. [That's not actually a flippant comment - I
didn't have an SDS drill until a few years ago, but wouldn't want to be
without it now].
Assuming you do any significant amount of driving - I'd say it falls
into the SDS category - you don't know what you've been missing until
you get one. I got my impact driver last year, after I was eventually
persuaded by comments on uk.d-i-y, and it really does make driving into
timber an absolute breeze. I built a very large timber playhouse with
it, and can't even begin to how I'd have managed without it! My
builder, who'd just got one, shared my enthusiasm.
I ended up getting one compatible with my existing drill driver - so I
could share the batteries. (I got a Makita to go with my Site -
rebadged Makita - drill driver.)
Ease of screw driving basically. They give less torque reaction to the
user, and are less likely to cam out. So you find you can use them with
far less physical effort. With a drill driver you tend to need to push
harder on the drill to ensure you keep the bit engaged in the screw. IDs
are easier you use when you can't easily get your weight behind the
screw you are diving.
Some more detail here:
Nope - totally different concept. Hammer drill hits the bit toward the
thing you are drilling. Impact driver uses and angular hammer action -
rather like tapping the end of a spanner for extra torque.
Think of those pneumatic tools the guys in the tyre changing places use
for the wheel nuts on the car. Same idea but without the hose.
They tend to be a little smaller and lighter than the equivalent voltage
combi drill. They will generate higher peak torques - so on the smaller
ones at least will be able to drive things the drill won't manage. (by
the time you get to 14 or 18V decent quality drills, they normally have
enough power to drive pretty much anything anyway so its less of an issue)
They do not have chucks having a hex slot. Hex drill bits can be used with
them. The "rotary" hammers does not kick in until there is resistance. So
using a drill bit into soft wood would not bring in the hammer action. If it
met resistance the hammer comes in and pushes the drill through. I found
that flat wood bits when even blunt can sail through wood using an Impact
Driver, which with a combi they do nothing except burn the wood.
yes, fantastic tool,
I bought a battery one a few years ago when I started on the house,
and then a corded one a year ago
which i've been using today to screw 3x3 s together for joists,
using 4" self drilling screws,
no pilot hole, no countersinking necessary,
I keep it with my Bosch PMF !
If you do any vehicle work - get a hexshaft-to-half-inch adapter so you can fit
1/2" drive sockets onto your impact driver. It isn't quite enough to drive stuck
wheel bolts, but can certainly deal with fasteners that are a hard slog without.
Impact drivers are also great with hex-shaft auger bits for drilling larger
diameter holes in timber.
I bought a 12 volt (from car battery) impact driver with a 1/2" drive from
Maplin ages ago for about 30 quid. Same sort of thing on Ebay now. It's
about the size of a mains electric drill. Will shift wheel nuts no problem
- and also great for doing crank pulley bolts without having to lock the
engine. Max torque is over 200 ft.lb, IIRC. Only possible snag is the size
- otherwise an extremely useful, tool, especially at the price.
*Plagiarism saves time *
Dave Plowman firstname.lastname@example.org London SW
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