Ron wrote: <Sorry, no. Neither is in any danger of walking out, whatever the glue line configuration. People envision fence posts walking out of the ground with frost heave and yes, this certainly happens. I was thinking more along different lines, walking-wise. Nails in wood walk out, sometimes all the way out in exterior applications. It happens all the time with natural wood siding on the east and south side of a building, unless something like a ringed shank nail is there to restrain the walking. Granted these situations experience temperature and humidity cycling and presumably much more aggressively than a piano sees. Also, through pinned mortise and tenon joints do a similar thing in high cycle environments. The wooden pin, which is over-sized for the hole and form fit as its driven through the cross grain tenon tongue will, unless restrained by glue, in high cycle environments, walkout...not in. However, seeing is believing, and I've been considering running this relative pin movement test for a while anyway. Movement of the pin is presumably pretty small. Can you describe your procedure...see if I can replicate your results. Jim Ialeggio -- Jim Ialeggio jim at grandpianosolutions.com 978 425-9026 Shirley Center, MA
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