Hi list.. and especially Newton Wanted to get back to all interested on the post to let ya'll know what it ended up with. You may recall I had a couple questions relating to two different pianos. 1. The "P" piano <grin> with the problem of missing unless the jacks were regulated well behind the knuckle core. As it turns out on this the set of hammers that were installed a couple years ago by another tech in town were all of 3 mm to short (bore length). To "compensate" this fellow had installed 3 mm of shims under the hammer rail. I really don't quite understand what he was after there, but it explained the problem I had getting the action in and out of the piano (drop screws scraping on the bottom of the pinblock). In any case a new set of hammers appropriate for the piano are on order, and I have a nice job ahead of me re-establishing a reasonably good geometry for the action. So that question is answered. 2. The Yamaha grand that had the dancing hammers in spite of a well bedded key frame. The bedding was just fine. All action screws were tight, found out that if I slightly wedged the top of the hammer rail against the underside of the pinblock the hammers didnt bounce when playing hard. I was convinced that there was a spring in the rail in the end, in spite of all the good advice I received on the list with regards to bedding, action mount problems etc. So I took off the hammer rail (thinking what the hell, I'll try anything) and was going to reinstall it and found the problem. The left tenor action bracket no longer lined up with the hole for the hammer rail at this point. It was in fact 2mm off and one had to start all screws for the rail and force the issue to getting them tight. This of course caused the spring in the rail. I plugged the hole in the rail, rebored and re-mounted the hammer rail and the problem was solved. This is a t year old Yamaha, and I dont think anyone has had a chance to dink around with it yet (but who knows). If this was a factory blunder... well its not one typical of Yamaha. In any case both questions are answered. Thanks again to all for the advice and good posts. Thanks again for Newton for taking the time to write out proceedures for action bedding. I hope many readers were smart enough to keep that one on their hard disks. Richard Brekne I.C.P.T.G. N.P.T.F. Bergen, Norway
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