Steam Roller, The problems I have encountered with S&S replacements have been in the center pin to core radius, nothing to connect with actual roller diameter; or maybe I just didn't notice. Regards, Jon Page At 08:19 AM 09/01/2000 -0600, you wrote: >Hi Jon, > So there is some Englishman in you, Roller indeed?????? >Just the observation's on Steinway's when some one installs the wrong >knuckles,and the severe alteration in touch weight, power, and repitition. >Not enough case studies to offer an opinion. O ther than the whole action >is screwed up. <G> > >Regard Roger > > > > >At 09:03 AM 01/09/00 -0400, you wrote: > >Graeme, > > > >I have not experimented with this alteration but I can envision a few of > >its consequences. > > > >With each size smaller roller, the capstan would have to be turned up to > >raise the wippen > >to maintain hammer blow. My concern would be where the 'magic line' > >intersects the > >capstan/wippen cushion contact. So if it came down to altering knuckle > >height to correct > >the magic line juncture (I'll call it the median line); I'd sooner change > >the capstan location > >to improve leverage. > > > >Also a smaller knuckle would have the jack clearing it sooner due to its > >diminished radius. > >With this decreased connection period, will it affect the dynamic control? > > > >As to how this attenuation might affect leverage, I can not speculate. > > > >I've limited my knuckle selection to the center pin to roller core radius. > >As pointed out > >during the Renner USA class in Arlington, as the c/p to knuckle radius > >increases; so does the > >knuckle diameter so as to maintain wippen attitude within the system. So > >the 15.5 mm radius has > >the 9mm knuckle and the 16.2 & 17 mm radii have the 10mm roller. > > > >Anyone do some "scientific" rescearch? > > > >Jon Page > > > > > >At 08:52 PM 09/01/2000 +1200, you wrote: > >>Hi list, > >> > >>I was speaking with a technician friend last night and we were discussing > >>another tech acquaintance (quite respected locally) who has been replacing > >>grand rollers (knuckles to some of you) with smaller sized ones. > >> > >>In his opinion he achieves a finer regulation, faster repetition etc etc. > >>So as I understand it he is say replacing a 10mm roller with 9mm and > >>sometimes 8mm. > >> > >>My take on this is that the geometry would be altered elsewhere. I'm not > >>knowledgable enough though to know what the possible negative effects could > >>be, if indeed there are any. > >> > >>Could some of you with experience in this throw some light on this, whether > >>it works well or not at all. > >> > >>I'm curious to say the least....... > >> > >>Many thanks, > >> > >>Graeme Harvey > >>New Plymouth > >>New Zealand. > > > >Jon Page, piano technician > >Harwich Port, Cape Cod, Mass. > >mailto:jonpage@mediaone.net > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > >Roger Jolly >Saskatoon, Canada. >306-665-0213 >Fax 652-0505 Jon Page, piano technician Harwich Port, Cape Cod, Mass. mailto:jonpage@mediaone.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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