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<br>
<font size=3>Greeting Jon,<br>
I doubt it, for two reasons. 1. The rail is not
very thick back there, so you can't make a significant saw cut.
2. The action brackets and frame has a lot of influence on
the position and shape of the rail.<br>
Remember these are very soft wood frames.<br>
<br>
Several solutions.<br>
<br>
Before starting, remove stack and keys, install the frame to pin point
where the problem is happening. ( Twisted action rails can be the
cause of the problem. ) I did not find that problem in 5
mins. (Grin)<br>
If the frame is now flat. you have a problem with action stack bowing the
frame.<br>
<br>
1. Shim the feet of the action brackets with veneer. To overcome
the bowing.<br>
<br>
2. Shim the frame in the dag areas and sand for a good fit and good
unacoda operation. The dags will hold the frame down.<br>
<br>
3. If the frame is badly bowed, shim the underside of the crown
with veneer and sand to fit.<br>
<br>
4. Minor knocking just sand the back frame.<br>
<br>
<br>
With Yamaha's I have bedded the back frame by changing the order of
bracket tightening. If it is knocking in the centre. Tighten the
outer brackets first, then the middle ones. If it knock's on the
outer area then tighten the centre brackets first. <br>
<br>
Fun and games.<br>
regards Roger<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
At 04:47 PM 2/12/02 -0500, you wrote:<br>
>Hi Roger,<br>
>Would this method also work on a Yamaha back rail? I have a
similar <br>
>problem on a C3 - the ends are well-bedded, but the area in the
<br>
>middle is rather uncooperative. There aren't any kerfs, save
the <br>
>cut-out for the una corda lever.<br>
><br>
>Respectfully,<br>
>Jon<br>
><br>
><br>
><br>
>>Hi Victor,<br>
>>
A healthy saw kerf half way through the rail, at <br>
>>the top of the crown, of the warp.Two kerfs, from the underside
<br>
>>about 6" on either side of the crown kerf. Shim the
lower kerfs to <br>
>>straighten the frame. Then bed the frame in the traditional
manner.<br>
>>Warped frames have a nasty way of moving with humidity changes,
the <br>
>>high side saw kerks, helps to stop any warping upward movement if
<br>
>>they are left open.<br>
>>Regards Roger<br>
>><br>
>><br>
>>At 07:41 AM 2/11/02 -0500, you wrote:<br>
>> >Heelo all,<br>
>> ><br>
>> >I need your help in deciding what to do with a Howard
#550 (Kawai) Ser#<br>
>> >2905365.<br>
>> >They key frame is warped upwards at the center of the
front rail. I am not<br>
>> >sure if the balance area or the back part of the4
frame is also warped. Did<br>
>> >not get the chance to look at it; and could not really
figure out how to do<br>
>> >it in a small apartment.<br>
>> ><br>
>> >What is the best remedy.<br>
>> ><br>
>> >Thanks<br>
>> ><br>
>> >Regards.<br>
>> ><br>
>> >Victor Belanger<br>
>> >Somerville, MA<br>
>> ><br>
><br>
>Jon Ralinovsky<br>
>Piano Technician<br>
>Department of Music<br>
>Miami University<br>
>513/529-6548<br>
> </font><br>
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