[pianotech] (no subject)

[Les Koltvedt]

Just a thought, would blasting them with a cold shot of freon in a can help?  
I'd think that in conjuction with heat would cycle the metal and work the wood 
some.

btw Ron, I just made myself one of those fancy dancy tools...

les

Date: Wed, 19 Jan 2011 13:56:16 -0600
From: Ron Nossaman <rnossaman at cox.net>
To: pianotech at ptg.org
Subject: Re: [pianotech] knabe knapstons
Message-ID: <4D3741E0.5030601 at cox.net>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

On 1/19/2011 1:22 PM, Chuck Vetter wrote:

> Am I crazy to create a slightly larger hole.......very slightly?


Well, you're demonstrably crazy, but this probably isn't why. <G>

Joe's right that a lubricant will make the wood spongy. That, in this 
case, is just what you need for a friendlier fit, in my estimation. A 
non-liquid lubricant will limit the spongy area to the interface between 
capstan and wood, which is also just what you need.

Or you can heat them out, which won't leave "residoo", and refit new 
capstans. The new ones will likely have different threads (Murphy) so 
you may have to plug the holes and start from scratch. It just depends 
on how much time you want to spend to get a pretty job that works about 
like a quicker and not as pretty job. But then if you're reengineering 
the action and maybe moving capstans in the process, that's an answer too.

On heating out capstans; I've used a propane torch with good result. All 
keys out and on the bench. Three or four seconds of the capstan head 
held in the flame (which is NOT pointed at the key stick. Bring the key 
to the torch), set the key down and grab the next one. Do maybe ten at a 
time allowing the heat to soak in and work, then go back and crank out 
the capstans with your handy wire crank. Heat the next ten, etc.
Ron N


      
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