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Re: Big IR impact gun

To: mporter@zianet.com (Michael D. Porter)
Subject: Re: Big IR impact gun
From: Chris Heerschap <Heerschap@kns.com>
Date: Thu, 7 Dec 2000 10:32:32 -0500 (EST)
Michael D. Porter wrote:
> > > > Now my only problem is how to justify the ~$550 for the 2161, IR's 3/4"
> > > > behemoth, rated at 1400ft-lbs. :)  So what if I would use it maybe twice
> > > > a year...
> > >
> > > jesus, what do you have that requires that?  I haven't found anything my
> > > 2131 couldn't twist.
> > 
> > The only things (why I would use it maybe twice a year) are crank bolts
> > for timing belt changes and the occasional really stuck bolt.  That's
> > why I don't have one yet! :D
> 
> I have to say that a 3/4" impact is probably overkill on any fastener on
> a Triumph, and for most other passenger cars. 

Of course!  But how cool is it to have something... anything... rated
for over 1400 ft-lbs!  Lord knows my Honda will never get there!  (not
even with the torque multiplication of the trans!)

> There's a mechanic's trick for upping the rating for a 1/2" impact
> wrench a bit. Disconnect the air line, squirt about 1/2 oz. of light oil
> into the wrench air fitting, hook the air line up again and have at.

Hmmm... cool, I will keep that in mind, thanks!

> Torque goes up about 50% for a few seconds. If that doesn't get it off,
> a 3/4" impact will just twist the head off the fastener. (!)

Now, correct me if I'm wrong, but I thought the benefit of impact guns
was that they aren't as likely to twist the head off because of the
impacting... as opposed to putting a continuous torque on the bolt.

Still... at 1400ft-lbs rated... what normal sized bolt could handle
even short bursts?


cmh
-- 
Chris Heerschap - UNIX Systems Mutilator/Postmaster

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