Good information on the coefficient of friction, but I don't see how it addresses anything; other than if you use the copper anti-seize and the torque numbers in the manual are based on non-plated fasteners you have a problem. You will probably have the bolt fail in tension because you are apply nearly three times the tension load and the bolt will shear fail.
The question still is "if the torque numbers in the manual are based on dry" is there a reduced torque number you need to use for lubricated because of the increased loading on the bolt? hawke On 7/3/02 10:38 AM, "Walt Garcen" <[EMAIL PROTECTED]> wrote: > The best torque wrench in the world doesn't know anything about coefficients > of friction or stress vs strain curves. Torque is torque and the issue here > isn't whether the tool is accurate within 10%, 1%, or 0.1%. > > -----Original Message----- > From: GTS-1000 Owners List [mailto:[EMAIL PROTECTED]]On Behalf > Of tom &jean > Sent: Wednesday, July 03, 2002 7:50 AM > To: [EMAIL PROTECTED] > Subject: Re: dry vs. wet torque readings ??? > > > Since I use the best torque wrench available ( made by the German mfg > Stahlwille) I do not have these > insignificant problems. > > Tom Beasley > > > ----- Original Message ----- > From: "Henry S. Winokur" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Tuesday, July 02, 2002 10:31 PM > Subject: Re: dry vs. wet torque readings ??? > > >>> Since dry vs wet can vary greatly, any structural bolts that would be >>> torqued under my supervision must be done per the AISC Calibrated torque >>> wrench method to verify proper tension. But since you people are mere >>> peons, not able to fully appreciate a Wilhelm-Skidmore bolt tensioner, I >>> would go off the following rule of thumb torque formula: >>> >>> T=(KDW)/12=foot-pounds >>> >>> where T= torque >>> K=friction factor >>> D= Nominal bolt diameter in decimal inches >>> W=clamp load in pounds >>> K=0.30 for nonplated fasteners, black finish >>> K=0.20 for electrodeposited zinc coatings >>> K=0.15-0.18 for oils >>> K=0.16 for cadmium electrodeposited coatings >>> K=0.12 for copper anti-seize compound >>> >>> Standard practice is to tighten a bolt to 70-75% of the proof load. > Proof >>> load is the point where a bolt will permanently deform more than 2%. >>> >>> Let me know if you need any more schooling. >> >> What we need is ENGLISH not ENGINEERING-EZE. >> >> Regards, >> >> Henry S. Winokur >> 94 GTS1000, AMA, MRF, >> Nationally Certified Riding Instructor >> Columbia, MD Ride for Kids Task Force >> West Bethesda, MD USA >> >
