[pianotech] Baldwin upright: bobbling hammers, poor checking

[Tom Gorley]

Gregor, The backcheck may have burnished itself into a hard slippery glaze.  Try 60 grit sandpaper to get that off.

---Tom

>    Tom Gorley
> Registered Piano Technician     
>       





On Dec 22, 2011, at 8:01 AM, Gregor _ wrote:

> List,
> 
> today I tuned a Baldwin from about 1980. With a fortissimo blow there was only a poor checking and therefore some nearly bobbling hammers. I think the reason is that the catcher buckskin and the backcheck felt don´t have a strong enough grip. Or it could be that the overall geometry of the action is not so well designed. There was enough aftertouch and no problem with a piano or forte blow.
> 
>  We don´t see many Baldwins here, but I guess in the USA this problem might be well known? The cather buckskin is made of a strange material, no leather.
> 
> Ever experienced that on a Baldwin (about 105 cm height).
> 
> Gregor
> 
> ------------------------
> piano technician - tuner - dealer
> Münster, Germany
> www.weldert.de

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