Ron said: "Another thing: I've noticed that pin torques two or three days after stringing feel higher than when you're installing them. This may be a body calibration illusion relative to the different levels of violence imparted whether stringing or tuning, and I've never taken actual measurements, but it's worth a look. How do those test piece torques match up today?" Ron, I have taken the torque data while testing various Pin Driving Fluids. I noticed the same phenomena. Torque readings taken at stringing time; a day later; a week later and a month later. On day the torque would be lower than a day or week. After a few weeks, and several chip tunings, etc., the torque readings kinda came back to the original on stringing day, but just slightly higher than the originals. Go figger! This was the case for several different PDF. As for the remark about the Rosin used as a Pin Driving Fluid, I tried it once. Definately not what I was striving for. The idea of the PDF is to lessen the trauma to the drilled hole when we drive the threaded tuning pin into it. What is does is make the wood fibers slippery and more pliant during the driving. This reduces the amount of chaffe due to the threads. I believe it also tends to seal the drilled hole somewhat. I have done studies with and without and have found that it also reduces the initial torque by about 20%, but only initially. I still have some test blocks laying around, (I don't throw anything away.<G>) Hmm? best get them out and see how the torques are holding up after several years.<G> Joe Garrett, R.P.T. (Oregon) Captain, Tool Police Squares R I -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100218/968bbdca/attachment.htm>
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