spring loops

[tom]

Rick.

            If you felt the “click “ and all the hammers are on the same
line my theory on this problem may be off base. .Also, I only suggested
removing one assembly to check that the flange is tightened in the correct
position..

Still the question remains---What caused such a drastic change in geometry?

            Tom Driscoll

 

   _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of richard.ucci at att.net
Sent: Monday, September 01, 2008 9:30 AM
To: Pianotech List
Subject: RE: spring loops

 

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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