Fwd: RE: Young Chang Action Brackets

[Kent Swafford]

Begin forwarded message:

> From: "Phil Glenn" <Phil@yca.tzo.com>
> Date: Mon Jun 9, 2003  12:53:01  PM US/Central
> To: <pianotech-owner@ptg.org>
> Subject: [admin] RE: Young Chang Action Brackets
>
> Please post this reply.
>
>
> Thanks,
> Phil
>
> Thanks Avery,
>
> I'll answer each of your questions, though basically any YC 
> manufactured grand piano dating
> from about 1990 to 1997 has the possibility of this occurring. If you 
> see anything that is weird or unstable,
> then you'll probably need to exchange the brackets. It will usually 
> start to show up between two to five years from new.
> Very rarely do you find any visual defect on the bracket itself.
>
> 1. What I DIDN'T see was everything I've read about it. I was able
> to easily pull the action out; the drop screws didn't scrape on
> the underside of the pin block, etc.
>         These severe symptoms only occur on very advance cases and not 
> always then.
>         The only predictable thing about the growing
>         brackets is that they are unpredictable... and the hammers 
> block.
>
> 2.  Besides the blocking, all I could see was that the underside of
> the drop screw was AWFULLY close to the front edge of the wippen
> buckskin and the jacks were mostly WAY too far back under the
> knuckle.>
>         As the brackets expand, it pulls the hammer rail away from the 
> wippen rail,
>         thus the jack is moved back from the roller.
>
> 3.  Besides measuring the spread (which I don't know what it's supposed
> to be) how can one know for sure?>
>         Measuring the spread is the only technical way to know, but 
> then the spread could be off for other reasons.
>         The affected pianos had a spread of 112.5 mm pre-1991 and 
> 113.5 mm post 1991.
>         It doesn't take much to make a huge     difference (1 or 2 mm) 
> but,
>         I had a tech the other day tell me that the spread on his 
> piano was 119.
>
> 4. It's had water leak/damage in the middle and 1st treble section and
> the strings and plate are rusty there. I can also see evidence of it
> by stains on the action rails and a few of the shanks.>
>         Water damage could cause the keyframe to warp, imitating the 
> bracket symptoms,
>         though the spread shouldn't change. But... if your going to be 
> doing major work
>         to a piano within the affected range, you may as well throw in 
> a set of brackets.
>
>
> 5. I just don't want to do the "growing action brackets" thing without
> being sure. Any ideas how I can BE sure? Thanks.>
>         Thanks for your concern. As this is a major warranty 
> situation, we have a need
>         to keep expenses at a minimum. However, the customer is our 
> greatest responsibility.
>         We don't want unstable pianos in the field when there is a 
> very easy fix.
>         When in doubt, seek me out.
>         I receive a paycheck because I am here to help you.
>
> The pianotech list is a great tool and resource,  I am sorry I can't 
> afford the time to monitor the internet each day,
> but I do try and answer all of my e-mails every morning.
>
> Sincerely,
> Phil B. Glenn, RPT
> National Service Manager
> Young Chang Acoustic Pianos
> (800) 874-2880 x110
> Parts, Jim Davis x132
>
> -----Original Message-----
> From: pianotech-owner@ptg.org [mailto:pianotech-owner@ptg.org]
> Sent: Monday, June 09, 2003 10:52 AM
> To: Phil Glenn
> Subject: Young Chang Action Brackets
>
>
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