How about "firm but free?" ;-] And yes, that's what I mean. I think pinning is on top of the list. Thanks David, William R Monroe On Thu, Jul 29, 2010 at 11:00 PM, David Love <davidlovepianos at comcast.net>wrote: > Do you mean that it’s rebounding off the cushion into the string on a > quick firm staccato blow? If so then check the flange pinning, it’s > probably too loose. I don’t see the balancier pinning as an issue as in one > suggestion. In fact, one can increase the friction in the balancier (and in > a performance piano one probably should) in order to be able to increase the > tension on the repetition spring (and thereby the jack return as well) > improving repetition immensely, especially with a hammer flange with > adequate friction (0-1 grams is not adequate friction btw). > > > > David Love > > www.davidlovepianos.com > > > > > > Hi List, > > > > Anyone know of anything chronic in Boston Grands (GP178) that has the > hammer double striking on a quick/firm staccato blow? I've got one that > does. Anyone have any ideas/solutions? The piano is finely regulated > otherwise (just today, in fact). 1 3/4" blow, about .400" Key Travel, > Checking about 1/2", Rep springs are definitely NOT jumpy. In all other > ways, the action plays nicely, controllably. And that is no mean feat. I > took some DW/UW measures today out of curiousity, and they were haywire. DW > range from 62g - 46g, UW from 18g to 35g or so. > > > > My thoughts are turning to action pinning (haven't checked yet). Key > Bushings and pins are clean and lubed (teflon), but that's as far as we > got. Wondering if tight pinning (of any parts) might contribute to this > rebounding back into the strings - and it is a full rebound. You can watch > the hammer appear to bounce off the rest rail, though I'm not convinced that > is exactly what is happening. Kind of musing aloud here.............. > > William R. Monroe > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100730/0b3583af/attachment.htm>
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