Thanks, Probably Thursday as the schedule is rather full. Andrew On Feb 27, 2010, at 7:08 PM, Chris Solliday wrote: > we certainly nedd to know at least the following: > String Heights sampled > Current hammer bore > Any obvious wear on the those hammers? > length of tails > hammer shank center pin height > wippen center pin height > clearance above drop screws at the pinblock > blow distance > key dip > let-off distance > key height > damper lift timing > Is this all factory work or has there been some custom rebuilding? > capstan height above key > check the line of center from the bottom of the balance pin hole to > the wippen center pin. Do the wippen cushion profile and the > capstan pass through the line at one half key dip? Where does it > pass through in relation to that line? > > You just might be right and shimming the back feet first (I'd try > 3/16, and perhaps a little (less than 1/8 under the shank centerpin > feet will solve your problems. IT's easily enough mocked up. and > regulate a few. yes if you do this, the ultimate arbiter will > probably be your capstan height. Should be 1/2 inch. check it first > and hope that it is low which it could be at 2" blow distance. Also > the fact that these hammers are over centering so much sounds good > for raising the stack but we need to know the string height the bore > distance and the shank center pin height. Have fun. > Chris Solliday, rpt > > ----- Original Message ----- > From: Andrew Anderson > To: caut at ptg.org > Sent: Friday, February 26, 2010 5:32 PM > Subject: Re: [CAUT] Shimming the Steinway Action stack to reach the > strings > > Mr. Solliday, > I was caught by the proff. in the parking lot after tuning for the > Chopin bicentennial concert. I'll have to dig through my notes for > what I found last time I investigated this. When I had the blow > distance at 1&7/8 I could have a nominal .390 dip with minimal > aftertouch ( jack fully clearing the knuckle with small visible gap: > I don't like too much but too little is another problem on hard > blows). Problem was the shanks were way off of the cushions and > there was lots of bouncing going on interfering with repetition and > touch. I couldn't get a consistent drop across the compass because > the drop screws were already backed out (1/4" drop in some cases), > one was broken and a number twisted so the screw driver was loose. > After talking to a Steinway tech in parts I got a box of shims sent > out. I suggested to the school that maybe this was a Steinway > warranty issue to be pursued with the dealer. The dealer sent an > irascible tech. who went for lots of blow distance and a lot of > aftertouch. This has turned out to be unsatisfying to the faculty > and they are now asking me to address the problem. > > I'll try to get back in next week and sample a number of different > parts of the scale. Seems to me that there was a specific note that > is measured and that it was 1/4" high last time I checked. > > I'm guessing that besides re-regulating I will probably have to warm > over the checking when done because of a potential change in angle. > Presently the hammers are all over-centering somewhere between 1/8 > and 3/16". They've had some minimal shaping (polishing to try to > get some power). Not enough, I think, to significantly change the > centering issue. > > Possibly backing the capstans out that much may loosen them and > require a little water thin CA glue to tighten. I'm also wondering > how much that will affect the capstan heel interface. > > I recall wondering about shimming the action rails (room under > fallboard but less then is available under the pin-block). I'd have > to revisit the damper underlever timing. The shift pedal slide > guides would need to be adjusted on the cheek blocks too. There > should still be plenty of bite for the shift lever but I could shim > that too. I recall thinking I could gain 1/8" under the fallboard. > I guess it would be easy to temp a shim under the rails and see what > the real, full-impact would be for doing so. Educational if nothing > else. > > I'll get back with hard numbers late next week. > > Andrew Anderson > > On Feb 26, 2010, at 2:26 PM, Chris Solliday wrote: > >> And Jim is probably right in this case, as over 2 inches blow >> distance is alot. Not to mention that you say the drop screws are >> fully backed out. You may need different dimensioned parts. I guess >> the point is that we in cyberspace need alot more information from >> you before we can get specific. >> Chris Solliday >> ----- Original Message ----- >> From: James N. Hess >> To: caut at ptg.org >> Cc: caut at ptg.org >> Sent: Friday, February 26, 2010 3:10 PM >> Subject: Re: [CAUT] Shimming the Steinway Action stack to reach the >> strings >> >> Often you are very limited on the amount you can raise the stack >> because of interference with the pinblock. My experience has been >> that you may be able to add 1/16". I think reboring the hammers is >> a better solution. >> >> Jim Hess, RPT >> >> On Fri, 26 Feb 2010 14:58:36 -0500 "Chris Solliday" <csolliday at rcn.com >> > writes: >> String Height minus Hammer Bore equals Shank Center Pin Height. We >> use laminated shim stock that we get from the local hobby store. >> Realize that just raising the pin height MIGHT work, but consider >> the arc of the hammer blow. You could end up with the hammer over >> centering if you simply raise the feet under the hammer flange >> pins. You need to imagine the pin in space and rotate the stack >> around it so that the stike point ends up at ninety degrees to the >> string. It might not be that now. Usually this means shimming the >> front foot slightly as well. Best of luck Andrew. >> Chris Solliday, RPT >> >> ----- Original Message ----- >> From: Andrew Anderson >> To: caut at ptg.org >> Sent: Friday, February 26, 2010 12:45 PM >> Subject: Re: [CAUT] Shimming the Steinway Action stack to reach the >> strings >> >> Yes, mea culpa. Wasn't really thinking the numbers...most likely 2"+ >> >> On Feb 26, 2010, at 11:30 AM, reggaepass at aol.com wrote: >> >>> >>> The school whose Steinways I service is not satisfied with the >>> dealer's warranty fix (greater then 1" blow distance). >>> Andrew, >>> >>> Not sure what you mean by this ("greater then 1" blow distance"). >>> Did you mean greater than 2" (since it sounds like the strings are >>> too high)? >>> >>> Alan Eder >>> >>> >>> >>> -----Original Message----- >>> From: Andrew Anderson <andrew at andersonmusic.com> >>> To: College and University Technicians <caut at ptg.org> >>> Sent: Fri, Feb 26, 2010 9:13 am >>> Subject: [CAUT] Shimming the Steinway Action stack to reach the >>> strings >>> >>> The school whose Steinways I service is not satisfied with the >>> dealer's warranty fix (greater then 1" blow distance). They are >>> requesting that the piano be made to play like it should which >>> will require shimming the stack so it is within reach of the >>> strings (>1/4" between fully backed out drop-screws and pinblock). >>> >>> Has anyone done this? What was the scope of work required? What is >>> a reasonable amount of time to complete the work? >>> >>> Thanks >>> Andrew Anderson >> >> >> >> James Hess, RPT >> 200 W. Allen St. >> Mechanicsburg, PA 17055 >> 717/580-1445 (cell) >> www.hesspiano.com >> >> >> ____________________________________________________________ >> Love Spell >> Click here to light up your life with a love spell! > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20100228/c79a9984/attachment.htm>
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