On Dec 24, 2007 8:26 AM, Annie Grieshop <annie at allthingspiano.com> wrote: > Comprehension perks slowly through my thick skull, but it gets there > eventually. > > One of the plate's tasks is to keep the pinblock and hitchpins at opposite > ends of the piano. It fails when the plate dis-integrates or the pinblock > delaminates, because either allows the various pins to achieve oneness (or > get closer than they should be) and compromises the piano, both > structurally > and tonally. > > For someone who loves cobbling things together (make it do or do without), > it's important to understand why sometimes you just gotta push that piano > out the window......... > > Thanks, as always and ever. Your willingness to share and educate is one > of > my best Christmas presents (and it keeps giving all year long <g>)! > > Annie Grieshop > > Almost there Annie, pinblock delamination in and of itself is a somewhat normal and eventually expected thing. It's when the pinblock seperates from the backstructure, in a vertical, or the perimeter bolts or occasionaly the nosebolts become loose through humidity change, cracks or a combination of both that he two ends of the plate attempt to meet! Pinblock delaminations aren't good and shouldn't be left but other than a few I've seen they rarely seperate in the extreme unlike back/block seperations some of which I've seen a full inch and more! I did not walk a way from those, I ran!! A most graphic example can be seen in most any Kohler and Campbell vertical built prior to 1985 that has been kept in the midwest where we have the extremes of humidity. They used a spruce back structure with the maple pinblock glued to it and, gosh, it seperated!!!??? Who would've thunk it? Almost any woodshop student after the first semester but not the "piano designers at K&C. Merry Christmas Mike -- People who say it can't be done, should not interrupt those of us who are doing it. Michael Magness Magness Piano Service 608-786-4404 www.IFixPianos.com email mike at ifixpianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20071224/1ea28f0d/attachment.html
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