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Old 20-12-2017, 06:09 PM   #1
voon
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Question Battery impact wrench confusion

Asking this here, because it's not per se a "Detailing Tool". I'd like to get one of these 18V machines for easy wheel changes ... but they come in confusing amounts. I've seen enough videos now to get an idea of what's quality and what's not ... but I'm a bit confused by the newtonmeters of torque.

If I look into the cars manual it says, I should use about 100 - 130 Nm on the wheel nuts. But I've not seen many impact wrenches. If I look at something like a Makita DTW285, it has three settings 80 / 175 / 280 Nm (many have just 1). None of that is usable for 100-130 Nm ... but yet, many people use these things to do their wheels. I don't get it. Do they use 80 and do the rest with a manual torque wrench? Or is there some magic behind it I don't get where you can set it to 175 and then somehow "not over do it" or so?
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Old 20-12-2017, 06:49 PM   #2
Alan W
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I would suggest you use the impact wrench to do the initial tightening to a lesser torque and then finish with a manual torque wrench as you've noted.

A quality manual torque wrench will be more reliable and accurate in the long term.

Alan W
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Old 20-12-2017, 07:07 PM   #3
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You need something like this, can not the English terme unfortunately.

http://www.biltema.se/sv/Bil---MC/Ve...st-2000028488/
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Old 20-12-2017, 07:19 PM   #4
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Oh, that looks interesting ... thanks
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Old 20-12-2017, 07:30 PM   #5
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I understand if it’s specifically a cordless one your after, but I have one of these
https://www.machinemart.co.uk/p/cir1...rench-kit-12v/

And use it for undoing and tightening and then finish of with a torque wrench, never a good idea to rely on the impact gun for final tightening.
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Old 20-12-2017, 07:42 PM   #6
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Trust me, you need a machine with more torque than 170nm to loosen the nuts,my machine has 450 nm and it struggling at times to loosen the nuts and I pull (tightening) my nuts with 135nm (excuse my French)

Last edited by Deje; 20-12-2017 at 07:49 PM.
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Old 20-12-2017, 09:06 PM   #7
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You will find many automotive guides to torque settings are very similar as it has a direct correlation to the size of the bolt you are either loosening or tightening. For general car use 100-150Nm is the rule. A Makita DTW285 would be fine for cars I have this and a DTW251. For bigger jobs DTW1001 will loosen about any nut I’ve seen. The impacts really help in loosening nuts and do play a part in tightening. Always use a quality torque wrench to calibrate the final tightness. I would also add good quality thin impact sockets are equally important. Thin is good as some standard ones don’t like to fit in alloy recesses. Never use standard non impact sockets as they can at least fracture and at worse shatter possibly causing you or the car bad damage bud.

Last edited by Moet1974; 20-12-2017 at 09:13 PM.
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Old 20-12-2017, 09:19 PM   #8
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I see a lot of impact drivers being marketed as suitable for "light automotive", would they be sufficient for casual wheel changes?

Not looking at getting one, just a question.
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Old 21-12-2017, 12:01 AM   #9
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Quote:
Originally Posted by JoeyJoeJo View Post
I see a lot of impact drivers being marketed as suitable for "light automotive", would they be sufficient for casual wheel changes?

Not looking at getting one, just a question.
honestly not really i have a ryobi impact driver that wont remove the wheel nuts I've put on by hand. It wouldnt stand a chance on anything put on my a garage
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Old 21-12-2017, 06:33 AM   #10
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Be very careful with impact drivers as they can do Some damage.
Some cars have aluminium nuts with a stainless steel cover (Ford) they become loose with the use of an impact gun and you will loose the cover reducing your nut size by 1-1.5 mm.
Mostimes you will find out at the most in-convenient time that your wrench doesn’t fit anymore (roadside)

Even my local tyre fitter doesn’t use them anymore they undo the the nuts with a T bar.
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