Front lid extended during performance

[AlliedPianoCraft]

With all this talk about the extension of the top lid (or as I call it the flap), one of the things that was never mentioned here is that the flap is not on the same plane as the top because of the top hinges. The hinges keep the main top slightly away from the piano case. When you open the flap while the top is up you are putting stress on the long hinge. If you were to put something between the flap and the case (maybe about 3/4" or so) you would keep the proper plane and relieve the stress on the long hinge. IMHO

Mr.G


----- Original Message ----- 
From: "Richard Brekne" <ricb at pianostemmer.no>
To: <pianotech at ptg.org>
Sent: Tuesday, January 08, 2008 8:19 AM
Subject: Front lid extended during performance


> Which pretty well sums this up.  Really... I have a hard time 
> understanding the big to-do here.  There is a difference between 
> uncarefully handling the front lid and carefully placing it in the 
> closed position with the whole lid propped up.  Sounds like some folks 
> are getting their P's and Q's mixed up.
> 
> I suppose if one is worried about the locals miscommunicating the need 
> for care one could advise in general to avoid this.  But to out of hand 
> deny an artist this when due care can be exercised seems uncalled for IMHO.
> 
> Cheers
> RicB
> 
> 
> 
> 
>    Since it has come up on this list, I did a little investigation on
>    the subject.  The rear lid, in the open position, is held away from
>    the spine of the rim by roughly the diameter of the hinge barrels. 
>    The back edge of the front lid is held at this position by its
>    attachment to the rear lid, but the front portion of the front lid
>    rests on the front corner of the rim.  This forces the front lid to
>    angle slightly below its normal co-planar relationship to the rear
>    lid.  This comes out to be less that a two-degree angle.  There is
>    sufficient space between the front and rear lid that this angle is
>    not sufficient to bring the lower edges of the two lids into
>    contact., so there is no leverage working against the screws in the
>    hinge.  It is true that the weight of the front lid is being
>    supported largely by the screws in the hinge, but there are dozens
>    of them.   If this were done on a daily basis with a heavy lid made
>    of MDF, I would be a little more concerned, but I would probably
>    just keep an eye on it, and treat it as a testing environment to
>    determine just how much it can take.  As was stated earlier in the
>    thread, and I agree, the risk of damage is greater when the front
>    lid is folded back of the piano cover.  
> 
>    Frank Emerson
> 
>
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