key bushings

[jolly roger]

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Hi David,
                 My brass cauls are .002" over size for balance rails, and 
.005" for front rails.
Ends up right on the money.
regards Roger


At 06:25 PM 9/5/02 -0700, you wrote:

>>When you leave the caul in for that long do you find you need a tighter 
>>fit, i.e thicker bushing cloth or you end up with too much play?
>>
>>David I.
>>
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>>----- Original message ---------------------------------------->
>>From: Baldwin Yamaha Piano Centre 
>><<mailto:baldwin@mta-01.sk.sympatico.ca>baldwin@mta-01.sk.sympatico.ca>
>>To: <<mailto:pianotech@ptg.org>pianotech@ptg.org>
>>Received: Thu, 05 Sep 2002 18:06:25 -0600
>>Subject: RE: key bushings
>>
>>
>>Hi Isaac,
>>I usually leave the cauls a few hours, but noticed that the sizing is not 
>>as stable as I like sometime.
>
>I have also noticed the same thing on field repairs using PVCE glue, some 
>times get a recall for a sluggish key.
>
>>
>>But as I use most often heated brass cauls, I guess the drying is faster 
>>(in surface anyway)
>
>Bin thar done dat.  Still do it if I'm in a hurry.  Usually on a rebuild, 
>we do every thing that is needed to the keybed, then the action analysis, 
>to determine what parts to order.
>
>
>I think the big area of movement, is the reaction of the water in the 
>glue, on the key button. Leaving them a couple of days, we have found no 
>sizing is needed on the bushings, only sizing the balance rail hole.  This 
>we size with a polished balance rail pin, chucked in a battery operated 
>drill, one quick pull of the trigger, and the hole is sized to 
>perfection.  We size from the top down.  No guess work as to where the 
>friction is coming from.
>
>Key bed fitting, friction control, and key fitting, is perhaps one of the 
>most neglected jobs in our craft.
>Regards Roger
>
>


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