Impact wrench question - MVAgusta.net
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post #1 of 16 (permalink) Old 06-26-2016, 10:20 PM Thread Starter
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Impact wrench question

For the experts out there,
I want to get myself a rattle gun for undoing the rear wheel nuts. If something is advertised as being 350Nm is that strong enough to undo a wheel nut that has been done up to spec or is there some advertising bs attached to the claim?
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post #2 of 16 (permalink) Old 06-26-2016, 10:51 PM
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What are you looking at Jon ? Portable electrical, wired electrical or air ?

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post #3 of 16 (permalink) Old 06-27-2016, 01:57 AM Thread Starter
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Cheapest is air, so I guess that will be the way I go. I have a compressor.
http://www.supercheapauto.com.au/onl...ecommendations
http://www.supercheapauto.com.au/onl...ecommendations
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post #4 of 16 (permalink) Old 06-29-2016, 06:59 PM
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I have the Blackridge Air Impact Wrench and it wouldn't budge to hub nut on my F3, ended up having to use brute strength on a 3ft power bar.

Remembering these nuts are reverse thread

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post #5 of 16 (permalink) Old 06-30-2016, 03:03 AM
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I think there are different sockets for use with rattle guns than those on a normal wrench with the rattle gun sockets being 'softer' and less likely to damage the nut. The black ones are for the gun but yuo had better check. I had a difficult rear wheel nut on my F4 where compressed air and a couple of people leaning on a long bar didn't work where as the electric rattle gun did so an investigation into different power sources may be warranted.
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post #6 of 16 (permalink) Old 06-30-2016, 05:39 PM
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Jon;
Since you have air get an air impact, check for used ones......

I got my CP in as new condition for $40 at a pawn shop

emmev125;
Impact sockets aren't 'softer' with ~3 times the wall thickness they are much 'harder'


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post #7 of 16 (permalink) Old 07-01-2016, 04:55 AM
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I might be wrong re the 'soft' comment but I was trying to make the point that there is a difference between standard & impact sockets. This is from ingersoll rand products website

Impact wrenches were designed with higher torque in mind — they bust bolts loose or torque them up in excess of 1000-foot pounds. It seems natural that when a person uses an impact wrench, they would use an impact socket. However, Cleve Pechuekonis, marketing manager at Ingersoll Rand, often notices that technicians are using regular sockets with impact wrenches. Not only does this affect the tool’s performance, it’s a significant safety concern.

“It’s common out in the field that someone will use a standard socket on their impact wrench,” says Pechuekonis. “The problem is that socket isn’t designed for that amount of torque, and the socket can shatter and become a safety hazard.”

Standard sockets aren’t equipped to handle the high torque of an impact wrench. Part of this is due to the materials used to make standard sockets and impact sockets. Standard sockets are made from chrome, which is fairly brittle and can split and shatter with too much vibration.

“Impact sockets are designed to handle the torque and flexibility without the product failing or shattering,” says Pechuekonis. Impact sockets are made from a softer, more malleable material called chromoly bdenum. This material is softer and more flexible to absorb the higher impact in situations where regular sockets would shatter like an ice cube. That’s not to say that an impact socket can’t split open. The important thing to remember is that they won’t shatter and send debris flying. Most impact sockets are gray in color or a black finish that looks like chrome.

So why would someone opt for a standard socket on an impact wrench? Pechuekonis notes that often technicians are unaware of which socket they’re using or don’t realize the difference between the two. A technician might go to the tool room or tool box looking for a 9/16ʺ impact socket. If the technician doesn’t have access to that, they might use the chrome standard socket in the same size — with the justification of “It’s just this one time.”

While it may be convenient to use a standard socket, safety is a major concern. The socket could shatter, sending fragmenting pieces in all directions. This can injure you and the people around you. You may also lose control of the impact wrench, causing it to fly off the bolt. When you consider that some impact wrenches turn 5000 - 6000 rpm, shattering pieces can go far.

When dealing with impact wrenches, you want the socket to wear out before the tool — and using the wrong socket can actually cause the reverse to happen. The impact socket should absorb most of the vibration.

Another tool manufacturer's comments can be found at http://bovidix.com/blog/the-differen...t-socket-sets/
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post #8 of 16 (permalink) Old 07-01-2016, 06:53 AM
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^^^Agreed...and nice write up from IR. Less brittle, more ductile.

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post #9 of 16 (permalink) Old 07-01-2016, 03:48 PM Thread Starter
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Just for the record, I purchased the Supercheap impact wrench, advertised as 310Nm. So one would have expected that it would easily cope with the nut torqued to 220Nm.

Total waste of time. It would appear that the advertised spec has very little to do with what it can be used to do.
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post #10 of 16 (permalink) Old 07-02-2016, 06:57 AM
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...or you need to understand stiction and corrosion and the effects on break-away torque....

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