Back-Action Traveling

[Richard Brekne]

Hi Terry, there was a great article in the Journal a few years back about
adjusting flanges position for good travel that I think would really put this
kinda thing into a clear perspective for you. The article related mostly to
hammer and whippen traveling but the principles are the same.

Anybody remember what year and month this was ?

Farrell wrote:

> Hi folks. I was traveling the back action today of a little grand I am
> finishing up rebuilding. I do not seem to be able to fully understand the
> geometry of this little bugger. It seems that there is a rotational
> component to some of the damper levers. As viewed from the piano bench (if
> the action were in the piano) you are looking nearly straight down the long
> axis of the damper lever, and of course, the dampe wire block sits on top of
> the end of the damper lever. Upon raising the damper lift rail, one can
> observe some damper levers travelling a bit to the right or left. But what
> also occurrs on some notes is a twisting motion of the damper lever that
> results in the damper wire block tilting (leaning) off to the right or left
> as the damper lever is raised. I realize that the damper wire blocks will
> move right or left with damper levers that travel right or left, but I am
> talking about a twisting motion along the long axis of the damper lever. I
> can only imagine that this would put quite a strain on the damper wire -
> pushing it against the guide rail.
>
> Is this unusual? What would cause such a motion? How can it be corrected
> short of parts replacement? Thanks for any thoughts.
>
> Terry Farrell
> Piano Tuning & Service
> Tampa, Florida
> mfarrel2@tampabay.rr.com

--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:Richard.Brekne@grieg.uib.no