spring loops

[richard.ucci at att.net]

Tom, you could be right, it is very difficult to check the pin when the butt in inserted. It felt like it popped into position, and all the hammers lined up at the same height. The idea was not to have to remove all the flanges during the loop repair process.
RU/UP
-------------- Original message from "tom" <tomtuner at verizon.net>: -------------- 


Rick,
This is puzzling. If the action is placed back in the piano in the same position as when it was removed the jack top to butt relationship should be unchanged. The main action rail and action mounting studs are untouched in the process.
I think you may have installed the hammer-butt assembly onto the flange and not matched the slot in butt with the center pin.  Essentially this will lower each hammer assembly pushing the shank off the rail and causing the hammer to block. Pull out one butt and flange, observe the slot and assemble correctly out of the piano. When I tighten the butt plate I move the butt until the center pin “snaps“ into the slot then tighten the plate. If I am correct when you put the assembly back in , there will be excessive lost motion and letoff on that note.
I can’t think of any other reason for such a drastic change in the key-action relationship.
 
This may be a good example of when to step back and figure out what has happened before readjusting everything.
I’ll be interested in what you find,
Best wishes,
Tom D.
 



From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of richard.ucci at att.net
Sent: Sunday, August 31, 2008 11:08 AM
To: pianotech
Subject: spring loops
 
List,
Just completed  Yamaha spring loop replacement. Followed Tom D's method. Went well , and after filing hammers, cleaning slots , cutting cord, and glueing new cords, it took about 6hrs.
 
When I installed the action back in the piano(p-22) , all of the hammers were way up off the rail and blocking when played. The solution I took was to lower capstans and lower let-off button and reset backcheck distance.
 
My question is: What caused the capstans to change their relationship to the whippens so drasticaly ?
 
Thanks,
Rick Ucci/Ucci Piano


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