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impact driver VS hammer drill
Posted: Sat Jan 20, 2007 3:05 pm
by Hinton Heating
What is the difference, in which circumstances would you use each.
I have a Dewalt 18v DC998 drill, which I use for almost everything. Is there any point getting an impact driver, what is its main use?
Posted: Sat Jan 20, 2007 4:19 pm
by big-all
completly different beasties
impact driver is purely for putting in and taking out bolts and screws
they work at high speed and when the load is greatest the motor turning is converted into a hammer /ratchet type motion so the power is multyplied
so instead of say 10 turns of the motor = 1 turn off the bit when on "full ratchet" [my description
] the motor will only move at 1/10th normal speed so 100 revs of the motor = 1 of the bit but at 10 times the power
so basicly it acts like a normal screwdriver on high speed and quite quiet
but as the load increases it turns into rotary impact but much slower and very noisy
hense the 140 +nm of 12v tools when a normal 18 v drill is around 40nm
will drive 4" screws through battons on wall like the battons balsa wood
also great for rusted in screws and bolts
Posted: Sat Jan 20, 2007 6:15 pm
by Hitch
I wouldnt be without mine.
I use it for virtually all screws, and bolts up to about M12.
If you are regularly driving in long screws or doing up lots of bolts get one.
If your only doing the odd 10 screws here and there i wouldn't bother.
One of the other advantage is the sheer smallness and lightness of them. Could see you whizzing off boiler covers in seconds.
I guess you can pick one up to go with your existing DW batts.
Posted: Wed Jan 31, 2007 10:45 pm
by Paslode_itw
Impact is really for driving a load of screws, decking for example.
I would stick to the dc988 Hinton.
Posted: Wed Jan 31, 2007 11:17 pm
by tim'll fix it
i have just got an impact driver
what a tool, it is the only way to put screws in and out
I now dont bother with pilots or countersinking
great for removing old screws. I couldnt be without mine now
Posted: Wed Jan 31, 2007 11:21 pm
by panlid
what do you use it for tim. i dont need to pilot to put 4" screws in wood with my bosch driver.
Posted: Wed Jan 31, 2007 11:27 pm
by tim'll fix it
everything now
it is a total different way to put screws in.
When I built the kitchen MDF units I didnt countersink or pilot the screws just pulled in
it starts to impact when the pressure gets on. Its is lighter and more powerful. It also has a very short body so you can get it into smaller spaces than a large combi drill.
it is perfect for removing old screws and you dont get any cam out going in or out and you dont have to lean on it as you do with a combi drill
mine is a 14.4v NiMH makita the one in sfx. I have a 14.4v NiMH makita combi drill and the impact is more powerful.
I was expecting to be disappointed but think it is the best tool I have now
Posted: Wed Jan 31, 2007 11:31 pm
by panlid
oh tim, im fighting it
Posted: Wed Jan 31, 2007 11:34 pm
by Only-Me
Have to agree...........they are shite hot at whacking great screws in
And not so little
Posted: Wed Jan 31, 2007 11:34 pm
by tim'll fix it
if you got one you would wonder how you lived without it.
put it this way I havent used my new passy once, I use my impact every day
there are some good deals on some naked models
