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Torque Explained - Fastening vs Nut Busting [IMPACT WRENCHES]
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- Опубліковано 16 лип 2020
- Have you ever wondered what Nut-Busting Torque is? We explain the difference between nut-busting torque vs tightening or fastening torque. Impact wrenches are often touted with nut-busting torque or breakaway torque. We use some common tools to explain exactly what this means. Our test subject was using the Milwaukee M12 FUEL Stubby.
Great explanation, and well within statistics and engineering gut feeling. Thank you. Nice work.
Very professional and scientific method of explaining and showing 👏.. I understood how is undoing needs less torque for a nut that been tighten down to a specific torque.. and now have an approximate estimation how many seconds should I hummer that stubby to have a suitable torque to the lug nuts (which is my purpose to buy this specific wrench).
Thanks a lot..
Thank you for watching and commenting.
You really can't expect an impact wrench to be precise with torque. There are too many variables to be accurate.
Excelente video 👌 y bien explicado.
Any idea what the average fastening torque per each mode is?
Wouldn't it be interesting to tighten each nut with say 190 FT/LBS clamping force using the torque wrench. Then mark the heads and metal bar with a felt marker. Loosen each nut about 1/8" turn and tighten with the impact wrench. Let us know if the nut tighten to the mark or goes past it.
I know when I owned a construction company a 2,000 pound drop hammer on a drag line would not drive AP-3 steel sheeting in some soils. If I fastened only a 700 pound vibro hammer on the dragline and clamped its jaws on the sheet, the sheet would go down like it was in butter.
Vibration as opposed to weight was the answer. I think the vibration got all rubbing surfaces moving thus less friction.
I wonder if the same applies to friction in fasteners?
Thanks for sharing, nice review
Thanks for watching, and thanks for the comment.
This is a really great test and explanation for the breakaway torque numbers they use in sales specs. I would love to see this test on the dewalt mid-range impact wrench, it advertises 330 ft lbs of fastening torque and 600 ft. lbs. of breakaway torque... way off the 80% you repeatedly find. Is there something else going on there?
We can do this for the DeWalt. The ~80% rule is not in regards to the actual torque specs, it's just in regard to the Marketing Hype of "Nut-Busting" or "Bolt Removal" torque. We are seeing manufacturers now tuning their cordless impacts to provide more power for removal and less for tightening. This capability is due in large part to the brushless platforms and the ability to control the power from the motor more precisely. Thanks for watching.
awesome video! is there a battery impact wrench that can preset the tight torque & it peeps when it reachs that preset? that would greatly save energy, time & extra tools
would probably cost more than 1 of each.
Interesting.. so impact wrenches don’t actually tell you the ft lb value you’re tightening to… are they mostly for loosening nuts or tightening bolts that can’t be over tightened?
Yes. They save time for mechanics and tyre shops. Also for pre-tightening bolts/nuts
Is nut busting torque only in a counterclockwise direction ? would the tool have the same ability if threads were left handed ?
Nut busting torque refers to loosening of the fastener, regardless of the direction. However, some of the tool companies have "tuned" their brushless tools to hit harder in one direction than the other. Thanks for watching.
Perhaps a dumb question: Would the fastening torque of the impact wrench just be the average recording from the digital torque wrench after loosening the nuts?
does a non impact take 100%? would make sense as the impact has mech advantage and loosening as easier as it spins but tightening is harder..
What torque wrench do you have please?
I think he said it a Proto Digital Torque Wrench. 🇺🇸
The first one you torqued to 210.6 but wrote down 206?
the extra metal around a 3/8 compared to 1/2" seems to make a difference with large sockets , 😅
Just a tip get the notebook 📓 closer to camera and torque display closer also 👍
Any reason you can think of that my brand new 3/8 M12 Stubby Impact with an impact socket and brand new, fully charged 4.0ah battery can't break loose any of my F150 lug nuts? They are all torqued to 150ft lbs. The lug nuts do have those plastic chrome looking covers on them but I was under the impression with all these UA-cam videos that it would have no issue. I also tried it on my brake caliper mounting bolts that are torqued to 184ft lbs and nothing? What do you think?
I would definitely think that it should be able to break those free, unless they've been on for quite a while and have some corrosion. Did you torque the lugnuts on, or someone else? Thanks for watching.
@@Shoptoolreviews I torqued them myself with a brand new torque wrench.
That’s very interesting I can’t see why it wouldn’t take them off, even my Milwaukee brushless impact driver with a 3/8-1/2 adapter can remove lug nuts, although not easy it still does it.
You aint pressing it long enough
You have to let it hammer for at least 10 seconds to let it build up enough torque before claiming it can’t do it. Also, don’t press hard into the nut, leave the wrench sort of free on the nut so that it can hammer with minimal friction.
I have a Milwaukee M18 impact driver with 1,800 lbs. of torque and I still can't get the anode rod out of my water heater. 1 1/8 socket
Is it an Impact Driver with 1,800 in-lbs, or an Impact Wrench with 1,800 ft-lbs? I would assume the impact wrench would have no problem removing the anode rod. Thanks for watching.
This test assumes that the I-beam is infinitely stiff. That is suspect. At a minimum, it would be fair to question if it is "stiff enough". Due to flexing of the I-beam, the torque put on each subsequent bolt is likely to reduce the torque on each previous bolt. I would prefer this test to be performed on a solid block of steel that either has a through-hole or has been drilled and tapped. That would reduce (maybe eliminate) all flexing of the I-beam. The flex variable needs to be eliminated, reduced or at least considered before the results of this test can be trusted.
So.....Are you thinking that the bolts are going through both flanges (aprox 8"), or are you referring to the give of the metal.......Either way, how many digits passed the decimal are you trying to evaluate? Dude does a real world test and you call him out on the most INSANE bullshit similar to not accounting for the gravitational pull from Uranus on the dam beam.....
That is a very interesting test TIm but that is not how they are calculated. In fact they are not calculated. It's two completely different tests on different test rigs. Send me a msg and I can explain to you.
Can't you just explain it here for the benefit of everyone? Thanks
This might add more information: m.ua-cam.com/video/P0sgP6xDVmM/v-deo.html
@@MrGW2fanboy Sorry Can't, trade secret.
@@EdwardEardley you are funny. 1st, he can't send you a message, yotutube doesn't have inbox since many years ago, 2nd rofl at "trade secret", everyone who is into mech engineering knows that.