Squeak in unacorda of S & S, B

[Horace Greeley]

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John,

When you have a chance to pull the keyframe, look to see if the trailing 
edge of the unacorda lever is digging into the bottom side of the cutout on 
the keyframe.  That is, when at rest the top of the lever is (nominally) 
parallel with the keybed (well, OK, it's supposed to be); and, there can be 
exceptionally little clearance between it and the underside of the keyframe 
cutout.  The problem is that, as the lever pushes the keyframe the treble 
end, the bass-side edge of the lever describes an arc which is going to go 
slightly above the line of the lever at rest.  The fix is either to radius 
off that edge of the lever and/or increase the depth of the cutout.

We saw this a good deal with they were moving from the PR keyframes to the 
Kluge ones (the latter, being much more flexible, at least during that time 
of production, were much less forgiving of things like this.

Best.

Horace


At 10:20 AM 3/13/2005, you wrote:
>One of the first places I went.
>John M. Ross
>Windsor, Nova Scotia, Canada
><mailto:jrpiano@win.eastlink.ca>jrpiano@win.eastlink.ca
>----- Original Message -----
>From: <mailto:davidlovepianos@comcast.net>David Love
>To: <mailto:pianotech@ptg.org>'Pianotech'
>Sent: Sunday, March 13, 2005 2:05 PM
>Subject: RE: Squeak in unacorda of S & S, B
>
>Did you lubricate the spot where the una corda iron contacts the key frame?
>
>
>David Love
><mailto:davidlovepianos@comcast.net>davidlovepianos@comcast.net
>-----Original Message-----
>From: <mailto:pianotech-bounces@ptg.org>pianotech-bounces@ptg.org 
>[mailto:pianotech-bounces@ptg.org] On Behalf Of John Ross
>Sent: Sunday, March 13, 2005 9:34 AM
>To: pianotech
>Subject: Squeak in unacorda of S & S, B
>
>Hi List,
>I was wondering if any of you have run/ran into this problem.
>It was a S & S model B, less than 6 months old. It is the first time I 
>have seen it, and I got a call yesterday afternoon, wondering if I would 
>have a look at a squeak problem, before a concert this afternoon.
>So I went this morning, (extra charge of course).
>I thought it would be an easy fix. But, noooooo.
>I checked all the obvious places, regraphiting any worn areas, tefloned 
>and MPL'd appropriate spots.
>Still there.
>Tried pushing shift lever by hand, still there.
>Not the spring on the right side, that bears on the action.
>Tried moving the action toward me, a smidgen, no squeak.
>Couldn't find anything wrong at the dags.
>Then I tried lifting the action at the right side just a smidgeon, gone again.
>I turned the glide bolt back 1/8 to 1/4 of a turn, most of it gone, but 
>still some at the other end, but very slight, turned left glide bolt up 
>less than 1/8 turn.
>Squeak gone.
>Not enough time before concert to get into it more fully.
>Have any of you ran into this causing a squeak?
>Is there a proper fix, that I should go back and do?
>Thank you.
>John M. Ross
>Windsor, Nova Scotia, Canada
><mailto:jrpiano@win.eastlink.ca>jrpiano@win.eastlink.ca

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