Yamaha Butt Spring Cord

[Tony Caught]

Hi Terry,

I'm tired, just driven 1,500 kilo in 15 hrs but, and I can't play either.

If the cord or spring is broken:- After the note is in check and you lift
your finger slightly of the key the not (action) goes out of check. At this
point (because the weight of the upright hammer in this position has no
backward weight) the pressure of the jack on the hammer butt is enough to
push the hammer forward and onto the string making a little note playing by
itself.  Also required to assist the hammer of the string faster than just
the bounce. Also to give some resistance to the hammer.

If you don't get the right answer I will two finger type a detailed
explanation.  Maybe.

Buy the new flanges from Yamaha (relatively cheap) Change all flanges, (very
little travelling to do) reface the hammers (most likely needs it anyway)
and align in piano.

6 Hrs

Tony



----- Original Message -----
From: Farrell <mfarrel2@tampabay.rr.com>
To: <pianotech@ptg.org>
Sent: Thursday, August 23, 2001 9:22 PM
Subject: Yamaha Butt Spring Cord


> We all have seen the broken cords on the hammer butt springs on Yamaha
> uprights. Perhaps many of us have replaced a set. I have several Yamaha
> uprights with this condition (several to many broken cords) in my service
> clientele. I don't play. I tune them. I hit the key and the hammer
returns.
> So what difference does the spring/cord make? I can see that if you had
slow
> action centers, it would make a difference, or if you were an advanced
> pianist, the quicker returning hammer might make a difference. I guess a
> broken cord should also cause a reduction in downweight and a decrease in
> upweight, and therefore an overall decrease in performance, i.e. less
> expression control because of too light a downweight and slower repetition
> because of slower key return.
>
> Hmmmm. Did I just answer my own question? I think I may have. Anything
else
> I have missed? Thanks.
>
> P.S. how many hours do ya'll figer to replace 88 butts, align hammers &
> travel? Maybe 12 to 14 hours? Has anyone any experience with other hammers
> on Yamaha uprights?
>
> Terry Farrell
>
>