The US Forrest Products Lab provides a useful method that uses the pitch of the thread.
Cheers AT -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Langford Sent: Saturday, 12 May 2012 11:34 AM To: KRnet Subject: Re: KR> How tight Bob Boyd wrote: >>So how tight is tight enough when tightening the WAF bolts? For the moment I'd say 5 ft-lbs for the 3/16" bolts, torqued at the nut, not the bolt head (but I'm sure you knew that already). Of course the 3/16" and 3/8" bolts that fasten the two WAFs together are much higher. I use an inch-pound wrench for those light torques to ensure higher accuracy (60 in-lbs). I have some spars with WAFs out at the airport and I'll do a little testing on that tomorrow to make sure I'm in the ballpark. I can torque until the wood yields a few thousandths to quantify it. I know my Sensenich prop's 3/8" bolts are torqued to about 15 ft-lbs (180 in-lbs) and that's just short of crushing the wood, but the prop is more dense wood... Mark Langford ML at N56ML.com website at http://www.N56ML.com -------------------------------------------------------- _______________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
