Pianotech

  • 1.  2001 Estonia 190 regulation stability issues

    Posted 10-31-2019 18:10
    Looking for experience on this Estonia model 190 and 2001 vintage. Renner action. About to do an action redesign. 

    Before I proceed, I have been noticing a very odd instability in the letoff. I've regulated it recently and the letoff instability persists. Seems to be letoff, not dip, or blow, which is odd, as letoff is mostly independent of bedding issues.

    I mention bedding issues, because of the way they forefinished it at the factory. Key bed front rail is bedded with elevator screws through the key bed. Balance rail bedded with glide  bolts. Back rail bedded by resting on keybed. Height of the fallboard felt when closed,  is  quite high relative to the keys, so they cranked the front rail elevating bolts to close that gap some. This means front rail elevating bolts are elevated a good 1.5mm - 2mm off the keybed. Glides set relative to that elevated front rail. The whole bedding, forefinishing thing seems suspect. However, the part that's got me scratching my head, is that blow and dip, on quick check seem to be stable, which indicated bedding okay. So maybe the wierd forefinishing is just throwing me off the real problem.

    It's the letoff that keeps migrating. Its not in the shop yet, so it could be the letoff rail screws are stripped or something wierd like that, allowing the letoff rail to move.

    Any experience with this model, or Renner stack letoff rails behaving globally oddly?

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    Jim Ialeggio
    grandpianosolutions.com
    Shirley, MA
    978 425-9026
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  • 2.  RE: 2001 Estonia 190 regulation stability issues

    Member
    Posted 11-03-2019 00:01
    How about some pictures ? Sounds like some of the stuff you encounter with failing action brackets . The letoff rail shifting around could be the sign of stripped screws or overlarge holes in the rail. Anything loose on the rails that are used to adjust action spread ? maybe some shims have fallen out or are too big . I had a Huntington grand here that was extremely hard to regulate because of the way various rails were attached and the presence of glide bolts coming up through the keybed from below and touching the front keyframe rail.

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    James Kelly
    Pawleys Island SC
    843-325-4357
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  • 3.  RE: 2001 Estonia 190 regulation stability issues

    Posted 11-06-2019 21:30
    FYI...the problem was the way the letoff rail is attached to the hammer rail, in this 2001 vintage Renner stack. Its a seriously rinky-dink connection...why they designed this into the stack is beyond me, I am going to re-configure the letoff rail-to-hammer rail connection. Straight forward, non-exotic fix.

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    Jim Ialeggio
    grandpianosolutions.com
    Shirley, MA
    978 425-9026
    ------------------------------