Torque is not affected in this case by deformation of the extension or other hardware at all. Zero. Torque is force x moment arm length.
Jeff Laman 1981 C&C34 "Harmony" Ludington, Mi ________________________________ From: David Miles <mi...@intergate.ca> Sent: Thursday, February 21, 2019 7:33 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Bolts, nuts and torque I could be wrong, but don’t you also have to allow for the torque/flex of the extension, therefore if you have a listed 250# value to be measured, you add the 15# rating of the extension, making your goal readout at a new number of 265#s? I am only guessing at the extension value. Need to check ours as well, but this thought comes to mind from many years ago. Would like to know if it has merit or not. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David via CnC-List Sent: February-21-19 3:35 PM To: cnc-list@cnc-list.com Cc: David Subject: Re: Stus-List Bolts, nuts and torque Renting a large torque wrench is a easy solution... >From my Android.... ________________________________ From: CnC-List <cnc-list-boun...@cnc-list.com<mailto:cnc-list-boun...@cnc-list.com>> on behalf of Charlie Nelson via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Sent: Thursday, February 21, 2019 5:46:47 PM To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> Cc: cenel...@aol.com<mailto:cenel...@aol.com> Subject: Re: Stus-List Bolts, nuts and torque Thanks for chiming in Josh. I like not buying a multiplier! Will have a look for a 250 ft-lb wrench etc. and review your video. Good catch on the the stud size—my msmt was with a ruler across the stud but was likely across the inside of the thread groove—plus 7/8” seems a little strange for such a large stud. The flats on the nut were much easier to measure. I like your ft-lb numbers since they are consistent with what I found for SS and reachable without a multiplier. Thanks again, Charlie Sent from AOL Mobile Mail Get the new AOL app: mail.mobile.aol.com<http://mail.mobile.aol.com> On Thursday, February 21, 2019, Josh Muckley via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Look in the description section of the video for useful links. https://youtu.be/n6B0IPKQERc If the flats of the nut are at 1-1/2 inch then the studs are 1 inch and you're looking at roughly 230 to 250 ft-lbs lubricated torque value. A large torque wrench from Home Depot or Lowes should max out at 250. It will almost certainly be 1/2 inch drive. Operating any torque wrench at its high limit is always difficult... But doable. I would probably try to save myself the money on a torque multiplier and just get the biggest torque wrench and 1/2" drive extensions and a 1/2 inch drive, deep, 6 point, 1-1/2" socket. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Feb 21, 2019, 1:41 PM Charlie Nelson via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com> wrote: It appears per list comments that it is OK to tighten my keel/centerboard 'trunk' without putting her on the hard. Since I can reach most of the nuts by removing the cabin sole, I figure its worth a try. I cannot reach the bolts under the mast this way but I can probably get to most of the others. My keel/cb trunk is pretty wide so there are 2 rows of bolts/nuts holding it to the hull. My guess is that I have 8-12 pairs of bolts and those that I can see are 7/8" diameter with nuts that are 1 1/2" across and appear to be stainless steel. BTW, my keel/cb trunk and board weigh-in at about 5600 lbs per the original specs. A quick internet search on torque wrenches, multipliers and torque values with my bilge depth in mind indicates that I will need a 1 1/2" socket with an extension of ~ 12 inches and maybe a torque multiplier, depending on the torque required. List sources suggest torques of over 200 ft-lbs are required and most common torque wrenches top out at 150 ft-lbs thus the multiplier. My quick look at recommended torques vs. SS (18-8) bolt sizes indicates 193-195 ft-lbs is recommended for my bolts which is consistent with values I have seen on the list and the C&C photo album, although a little on the low end. OTOH, I might be able to use a bigger/longer torque wrench without the multiplier. Either way, I am not certain of what drive size to either rent/borrow or buy--and the cost is substantial if you go from the 'standard' 1/2" drive to 3/4" or higher. Questions for the list: 1. Are my torque values ~ 200 ft-lbs within the ballpark? I seem to remember some list recommendations at ~ 350 ft-lbs! 2. Also, what is a reasonable drive size to use? 3. Should I just go with a larger torque wrench (which will reach the ft-lbs required without the multiplier)? 4. Any likely issues with not tightening the bolts under the mast until my haul-out this summer? TIA Charlie Nelson Water Phantom 1995 C&C 36 XL/kcb _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. 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