impact wrench -- how much torque do I need for semi lugnuts
looking for a reasonably price air impact wrech -- someone posted a while back they bought one at northern tool and have had good luck with it -- I am looking for a 3/4 inch air impact -- how much will I have to spend and what is the minimum torque I should consider -- also my compressor has 125psi is that good enough and It doesnt have the same size air line as the local car stop uses for the air impact they use -- so will this affect the performance if my air line is smaller
If you have a decent 3/4 inch wrench, then you will find that the hose is the restriction. What we did was rigged a second outlet on our air compressor and went to a larger hose on that outlet specifically for the big impact. Typical air hose is 3/8, and you want to be in the 5/8 inside dia range to run a large gun. As for pressure, 125 will do the job, but if the size of your tank isn't big enough, then you may have to wait for the pump to build it back up to full pressure before you can use it. If you can come up with a second tank, plumbing it in and having some reserve air storage capacity helps a lot.
I lucked out last year, picked up a 1" Chicago Pneumatic impact at a farm auction for 60 bucks. Heavy as heck, but it's oine heck of an impact for car work.
475 ft lbs for bud wheels
give me a big blue ingersol -rand
I use my 1/2 IR231 impact on my Budds! Takes about 8 seconds of pounding to get em off. Bought the Budd wheel socket set at Harbor Freight for cheap but it seems to be a quality set.
Gotta use a 1/2 to 3/4 adapter with the sockets. I always check the TQ by hand when I'm done.
The IR 1/2 inch impacts are some of the best ones on the market, and can do things that you wouldn't think a 3/4 inch could do. There should be one in every mechanics toolbox. I don't know what it is about them, but they are one of the most amazing tools you can buy.
Listen to Cabover Pete, each style of wheel has its own torque rating. Check with your local dealer for torque specs. The air impact gun may suffice in taking the wheel off and starting the process of putting the wheel back on. However, torquing the wheel to spec is the only way to go.
Here's a good start.
then of course does it call for "dry" ft pounds or lubricated ft pounds
I don't do my own tires anymore but when I did I was allowed to use the mechanic shop of the co. I was leased to. There was a chart that gave torque etc and budd wheels(with inner and outer studs) were not supposed to be lubricated (even though everyone did any probably does now) so it was a dry torque The single stud budd type wheels called for a lubricated torque. I am working from memory here so if you do your own tires look it up.
How do we determine how much CFM's the car puts out? In other words, can the car's compressor power a 1/2 impact asking for 5cfm@90psi connected thru the gladhands?
At 24cfm@90psi? (max power)
I've tried the 1/2" impact of the car compressor, takes forever, not enough air volume in the tanks.
Now if your just using it for small nuts and bolts , maybe, but for taking off the lugnuts or putting them on forget it.
Also there is too much restriction to do anything that consumes a lot of air thru the glad hands, I have a hook up direct to the air tank on my KW.
Most cars put out about 15 CFM, trouble is there is no volume in the tanks, the car doesnt need volume for the brakes, like air tools do.
I have an IR "thunder gun" its good for 1000 foot pounds, BUT I still wouldn't tighten my lug nuts with it, I use the 1" drive gun on those.
I wouldn't use a 1" gun to tighten the nuts. They only call for 475 ft lbs. Overtightning them could damage the studs, drums or hub.
only thing is if ya if a blow out on the side of the road & call out road service most of the time they're gonna have a 1" impact gun to loosen & retighten the lugnuts .
just something to keep in mind yall
we always used a3 /4" or 1" impact on our tires most of time it was a 3/4" ir 261 man that was 1 jam up impact gun
yall have a safeone
good point bull dog and how would they know what kind of torque a gun will put out.
I doubt if any tire joint checks how much torque their gun is putting out or any caring company for that matter.
When was the last time you saw someone using a torque wrench on lug nuts? Its pretty much a "close enough " procedure.
On the daytons I used to use a lug wrench.
I was told to just keep tightening until they "sing"
Then a guy told me to use a cheater bar and lets say I was 200 pounds , if I stood on the bar 3 feet away that would be 600 ft lbs etc
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