Oops. where the SOS system is attached to the belly block, etc., you shouldn't need the S&S spring gage. Some days I have "Steinway-on-the-brain" syndrome. But, also meant to ask: how are you testing the function of proper SOS operation? From key lift and / or sustain pedal lift? How is the system failing in part or in full? On Tue, Jul 20, 2010 at 7:00 PM, Nicholas Gravagne <ngravagne at gmail.com>wrote: > Hi Ed, > > Could you give us a bit more information? Was the SOS working OK before you > removed the rod to repin? Are sections of the SOS working correctly? Which > section is not, and what are the symptoms? > > Where does the knife blade rotate to relative to the horizontal key bed? 3 > o'clock (as viewed from the treble end)? More or less? As pointed out, the > tabs need to be in a (more or less) straight line. Are some catching and > some not? This symptom is characteristic of at least a few significant > possibilities: knife edge not rotating far enough; rotating too far; knife > edge too far rearward (grabbing and noisy) or too far forward (some tabs > catch, some don't); knife edge too high or too low. > > Do you have the Steinway SOS spring gage that assists in setting the height > of the rod relative to the keybed, and ditto on the underside of the tabs. I > assume the piano is not in your shop. > > Need more info. This should be a relatively easy fix if all the components > are steady, properly bushed, and working from the pedal to the rod. > > Nick > > > On Tue, Jul 20, 2010 at 5:48 PM, Ed Carwithen <edwcarw at yahoo.com> wrote: > >> I need help getting the adjustment right on the sostenuto mechanism of a >> 1918 Sohmer 9 foot grand. >> >> This is a piano that I have been servicing for several years but one >> section of dampers has always been a problem. I knew that I would have to >> repin the under lever flanges some time and this past week was the time. >> >> In order to get to the under lever flange screws I had to unhook the >> sostenuto rod. I got the flanges repinned and back and they work fine, but >> now I can't get the sostenuto regulated. I have fiddled with it (and >> fiddled with it; and fiddled with it) but just can not get the tolerance >> correct. >> >> Any suggestions from the collected wisdom of this website would be greatly >> appreciated. >> >> HELP!!!! >> >> Ed Carwithen >> John Day, OR >> >> > > > -- > Nick Gravagne, RPT > AST Mechanical Engineering > -- Nick Gravagne, RPT AST Mechanical Engineering -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100720/d1db39ba/attachment.htm>
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