RE: [DMCForum] Angle Torque... what the hell?

["Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>]

I imagine if one of the bolt heads came off (the likeliest point of
separation) that it would make a god awful racket. I think I'll pose this
question to DMCNews and see if I can illicit a broader response.

> -----Original Message-----
> From: timnagin [mailto:timnagin@xxxxxxxxxxxxxx]
> Sent: Tuesday, July 22, 2003 2:10 PM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: RE: [DMCForum] Angle Torque... what the hell?
> 
> >>http://groups.google.com/groups?q=angle+torque
<http://groups.google.com/groups?q=angle+torque&hl=en&lr=&ie=UTF->
&hl=en&lr=&ie=UTF-
> 8&selm=358
> 91
> >>29A.5053%40engr.uark.edu&rnum=1
> >>
> >> Torque-angle method is where you tighten the bolts to a specified
> >> torque in a specified order.  Once that is done, you mark the
position
> >> of each bolt head and turn it an additional amount like 1/4 turn, 1/2
> >> turn or some other specified value.  This results in "stretching" the
> >> bolt a known amount which results in a particular retaining or
> >> clamping force being applied.  It is generally used in conjunction
> >> with throwaway or single-use bolts because they have been stretched
> >> when installed.
> >
> >It sounds like the stretching of the bolt may require that it be
> replaced.
> >So, it is just a little extra twist. In this case, torque it down and
> turn
> >it a little more than 1/4 turn (90 degrees) to get the 113 degrees
> required.
> 
> It also seemed to be related to dissimilar materials being used in one
> application.  So, I guess the best thing to do would be to replace the
> bolts
> each time since they have been stretched, and reduce the possibility of
> fracture.  I wonder how many have fractured, causing the head to warp
and
> eventually leak.
> 
> Greg
> 
> 
> 
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