learned something about drivetrain wobbles today

[Bogach, Konstantin (IT)]

Sorry,  after sending out my e-mail I felt that it was too banal for
this list.  But... if it  is square then it can not be any different
between using different sockets.  It is that simple.
 
Konstantine
 
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Message: 7
Date: Thu, 4 May 2006 19:30:43 -0600
From: "DeWitt Harrison" <six-rs at comcast.net>
Subject: Re: learned something about drivetrain wobbles today
To: "Bogach, Konstantin \(IT\)" <Konstantin.Bogach at morganstanley.com>
Cc: Quattro List <quattro at audifans.com>
Message-ID: <001001c66fe3$87752ae0$6501a8c0 at D3SX7V01>

Interesting point. When I use a torque wrench with an extension, I
automatically use my other hand to stabilize the driving end of wrench
so that the extension does not cant sideways. This is so automatic I
didn't even factor it into my response. (I think my understanding of the
original problem would be better if I could see to what degree the deep
socket may have been forced off axis during torquing.) If the socket or
extension is kept on axis by that second hand, the force needed to do so
is small, and I doubt it would produce a significant error. Excellent
observation, nonetheless, and a good caution to take care to keep it
square for accurate torque.

DeWitt Harrison

'88 5kcstq
On Thursday, May 04, 2006 10:04 AM
"Bogach, Konstantin (IT)" <Konstantin.Bogach at morganstanley.com>wrote:
> Torque would be same if the angle of application is same, and ideally 
> everything is perpendicular. If it's not then part of the applied 
> force will push the bolt longitudinally and the rest of force will 
> rotate the wrench (bolt) and create the torque.
> Different sockets may have different degree of loosness in the socket.
> Theoretically even same socket but different wrench position and you 
> will have exerted your force/weight under different angle. When using 
> long sockets the torque often tends to be less due to greater part of 
> the applied force will go along axle and less part to rotate the bolt 
> or nut (because you push bolt's head to side more insteand of trying 
> to rotate it)
>
> Konstantine
>
> DeWitt Harrison wrote:
> >
> > I'm puzzled by your experience and can't figure out what's going on 
> > because torque is torque and any 'twist' in a socket or an 
> > extension ought to make no difference. The torque seen at the 
> > driving end and the working end are the same by definition.
Something else must be afoot.
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