grand action problem

[William R. Monroe]

Scott,

I'd make sure to double check everything else first, but what thickness
letoff buttons does it have.  If they are 8.4mm, order a set of 4.2mm
Buttons from Renner.  I had the same problem with a piano of mine and that
ended up being the sol'n.

William R. Monroe
Madison, WI
Assoc.



----- Original Message ----- 
From: "Scott Helms" <tuner@helmsmusic.net>
To: <pianotech@ptg.org>
Sent: Wednesday, December 15, 2004 11:28 AM
Subject: grand action problem


> Hello -
>
> I am regulating a 1984 6'9" Schimmel grand. It has a Renner action, and
> the letoff buttons are the wooden dowel type which screw directly into the
> underside of the hammer rail. My problem is that I can't get letoff close
> enough to the string. The closest I can get it is about 7 mm, and that's
> if the dowel is screwed all the way up against the bottom of the hammer
> rail. I've checked and double-checked all of my string height
> measurements, and it just won't work. I've only regulated about 10 or 15
> actions, so I'm still learning, but the only way I can see to get the
> buttons up higher would be to shim the entire hammer rail so it sits
> higher than the action brackets would indicate it should. There's plenty
> of room under the pinblock to take it as high as I need to, but I'm not
> sure that this is the proper fix for the problem. I'm afraid a change in
> hammer flange height might create checking problems or other regulation
> issues. I probably would only need to raise the rail a few millimeters to
> get the letoff I need, but why would this piano have come out of the
> factory with such a huge geometry problem? Am I missing something? Is this
> one of those "action spread problems" that I've heard about in Technical
> Institute classes?
> -- 
> Scott A. Helms, RPT
> Helms Music Enterprises
> (269) 381-4521
> www.helmsmusic.net
>
>
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