[CAUT] Which S&S replacement action parts?

[David Ilvedson]

All modern Steinways after CBS have teflon impregnated bushing cloth?   Hamburgs are Renner and have the graphite...which is fun also...
I mentioned the same thing...I was thinking the previous center pin had been buffed by the bushing cloth and lost friction.    
I am lubing the centers and pinning tight...I disregard the swing test completely.   

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Fred Sturm" <fssturm at unm.edu>
To: "College and University Technicians" <caut at ptg.org>
Received: 6/27/2008 4:36:27 PM
Subject: Re: [CAUT] Which S&S replacement action parts?


>Hi Chris,
>	Yep, I have the same problem. Nope, I don't have an answer or a  
>procedure. It is definitely different to work with. The first thing  
>that really puzzled me was when I found that I could remove a pin, and  
>the same size pin would feel tight enough or even too tight (pushing  
>it into the felt by hand). So I tried reinserting the same pin  
>(Steinway pin, with the rounded edges). And, sure enough, the friction  
>had gone from 0 - 2 gm to 4 gm. Just removing and replacing it. I  
>guess the felt/teflon expanded while the pin was out. The friction  
>level went back to 0 - 2 gm overnight.
>	So what do I do? Mostly, they seem to stay firm (feeling the end of  
>the hammer for wobble) for a good long time. If I get wobble, I repin  
>with the next larger size. I ignore friction measurements, as long as  
>it swings freely enough. Firm by feel and swing free is my only  
>parameter. I won't say I am comfortable with this exactly, but I find  
>I can regulate to the low friction okay (over the years I have got  
>pretty good with butterfly springs). I like it better than the solid  
>teflon, which always had/has too much friction if I just ream with the  
>prescribed size reamer, and too little friction if I use an  
>intermediate (.0005 above pin size as oppose to pin size to the .001).
>	I'm just out there trying to make things work, and it seems like it's  
>easier to go with the flow than to fight it. And it seems to work  
>okay. So I have tried to alter my "inner imagination" to conform with  
>it.
>Regards,
>Fred Sturm
>University of New Mexico
>fssturm at unm.edu



>On Jun 26, 2008, at 8:41 PM, Chris Solliday wrote:

>> Fred, I have problems when reaming (hard to imagine that some need  
>> it with
>> free and firm and teflon) this cloth. Do you? I haven't found a  
>> really good
>> burnishing technique or sizing solution. Have you?
>> Chris Solliday rpt
>> ----- Original Message -----
>> From: "Fred Sturm" <fssturm at unm.edu>
>> To: "College and University Technicians" <caut at ptg.org>
>> Sent: Thursday, June 26, 2008 10:05 AM
>> Subject: Re: [CAUT] Which S&S replacement action parts?
>>
>>
>>> On Jun 25, 2008, at 7:47 PM, Barbara Richmond wrote:
>>>
>>>> I haven't worked on many newer Steinways with the low friction but
>>>> firm
>>>> cloth.  Actually, I have strips of it and I haven't figured out yet
>>>> how
>>>> anyone has determined that it is so firm.
>>>
>>> Hi Barbara,
>>> The felt itself isn't particularly firm. In fact, it might be on the
>>> spongy side. After the parts are pinned, the centers are dipped in a
>>> solution of a teflon-like substance. It hardens in the felt. Around
>>> the edges of the dipping baths, there is white substance where the
>>> solvent has evaporated and left the solids. It feels much like what
>>> you get if you let McLube evaporate.
>>> The firmness of the bushings comes from impregnation of the felt with
>>> the lubricating substance.
>>> Regards,
>>> Fred Sturm
>>> University of New Mexico
>>> fssturm at unm.edu
>>>
>>>
>>