I think our lugs/mating surfaces are cadmium plated, we don't use copper anti-sieze (mine is molybdenum but it meets MIL-A-907E), he seems to assume we are lubing the mating surfaces and, as most engineer types don't, he's got no sense of how to communicate with us peons... Was that supposed to be a math formula? What is a foot minus a pound? A toe? Just let him come down here, I'll borrow my teeth back from cousin Clem and bite him on the foot/pound ;>) FL Kev
--- "Crisler, Jon" <[EMAIL PROTECTED]> wrote: > Also, I assume this means oil just on the threads, > and not on the > fastener/clamped surface ? > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Friday, June 28, 2002 2:45 PM > To: [EMAIL PROTECTED] > 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. > > Jay > __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com
