Hi Anne Creep in conditions like you mention seem quite easy to understand. There is a kind of shear stress on a hitch pin rail that is glued to a soundboard. But there is another point from his site I found very disturbing . The assertion that Titebond and similar glues never really harden and impart (to some degree) kind of damping effect, absorbing some of the vibration energy instead of either reflecting or transmitting. This has immediate implications for modern piano building as well as older instruments. I'm not so sure how much a problem Creep is in situations where there is not immediate and significant levels of shear stress on the glue. But I'd like very much to hear more in depth comments about all this in general. I'm not sure I'd have a problem using Titebond to fix a broken shank out on some field repair job. But thats not really what I was talking about. When in a restoration shop one has a variety of choices at hand. Cheers RicB Ric wrote: Hi Folks Reading in one of Anne Ackers i found a reference to the website of one Paul Poletti who has a side dedicated to glue. Please look over the following and provide comment. Thanks RicB ****************************** He's absolutely right. Most harpsichords built with aliphatic glues in the 1970's and 1980's demonstrate cold creep very nicely with the shrinking of the gap as the soundboard creeps forward, e.g. Besides, hide glue is so EASY to use. If it stinks, you're using bad stuff. Anne
This PTG archive page provided courtesy of Moy Piano Service, LLC