It is Interesting, using PDF the torque starts out lower and then firms up a bit. In fact, when you first drive those pins with the PDF it’s a bit frightening. The stuff works as a nice lubricant for driving the pins and probably doesn’t tear up the inside of the hole as much. Then when the resin is absorbed into the end grain of the block and dries, the pins firm up nicely and don’t change a lot over time (humidity swings aside). But I’m straying a bit here. David Love www.davidlovepianos.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of PAULREVENKOJONES at aol.com Sent: Wednesday, February 24, 2010 5:25 PM To: pianotech at ptg.org Subject: Re: [pianotech] Tuning pin torque?!?!? James: I also use the Bolduc 5-ply maple, and my experience mirrors yours. Average torque after a year is about 100-110 ip. Initial torque is in the range of 140-160 ip--starting friction higher then leveling. Paul In a message dated 2/24/2010 5:44:07 P.M. Central Standard Time, j.williams3 at tcu.edu writes: Thank you for your gracious response. I appreciate David Love’s response as well. The information that you have submitted is most helpful. For the record, I like to see something in the range of 120-145 inch pounds on one of my rebuilds using a 5 ply maple block. It does tend to settle down to around 90-100 inch pounds after one year. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100224/56d26ca7/attachment.htm>
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