[pianotech] Hammer Line Issue

[Porritt, David]

Bring the letoff back to 1/8" and increase the dip so the hammer doesn't bounce off the jack.

dp


David M. Porritt, RPT
dporritt at smu.edu<mailto:dporritt at smu.edu>

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Matthew Todd
Sent: Thursday, May 07, 2009 6:05 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Hammer Line Issue

I serviced the Kawai today.

I adjusted the capstans, letoff and checking.  It went really well.  Although, when I was doing the letoff, I couldn't get the piano to do 1/8''.  When I did 1/8'', and then pressed the note pianissimo, it would double strike, so I did just a little bit more letoff and the issue resolved.
Here is a bigger question.  After I finished, I played a Bach piece, and one thing I did notice was that it was somewhat difficult for me to play really soft.  Is there something more I need to do to obtain this?  Or, maybe to state it better, I could play "forte" and even "piano", but to obtain a "mezzo piano" was difficult.  What can I do that would help with the dynamics?

Thanks again for all your help,
TODD PIANO WORKS
Matthew Todd, Piano Technician
(979) 248-9578
http://www.toddpianoworks.com<http://www.toddpianoworks.com/>


--- On Thu, 5/7/09, pgmilkie at juno.com <pgmilkie at juno.com> wrote:
From: pgmilkie at juno.com <pgmilkie at juno.com>
Subject: Re: [pianotech] Hammer Line Issue
To: pmc033 at earthlink.net, pianotech at ptg.org
Date: Thursday, May 7, 2009, 2:07 PM

I can't say for sure, but I suspect that it was caused by moisture swelling

the backrail felt.





Remove the keys in the section the hammer line is not resting on the hammer

rail. Check the back rail it could have warped,  could have separated from the

key bed and it is raising the hammers. I have seen this on a P22 Yamaha only

three years old.





Glue and clamp



Paul Milkie



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