Counter-bearing drag

[Dean May]

ROFLOL

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES
Sent: Wednesday, August 08, 2007 5:55 PM
To: Pianotech List
Subject: Re: Counter-bearing drag

 

It's the mythology to which I referred. Language does strange things as we
both know. Since we, as a group, tend to be technicians and not engineers,
our language tends to be self-lubricating :-).

 

Paul

 

"If you want to know the truth, stop having opinions" (Chinese fortune
cookie)

 

 

In a message dated 08/08/07 08:55:32 Central Daylight Time,
deanmay at pianorebuilders.com writes:

VERB:Inflected forms: lu·bri·cat·ed, lu·bri·cat·ing, lu·bri·cates
TRANSITIVE VERB:1. To apply a lubricant to. 2. To make slippery or smooth.

 

It is of course the second definition to which I was referring. On a
molecular level the interaction of some metals against each other produces
an above normal amount of friction, while others, e.g., steel on brass,
produce a friction level below what one would normally expect. Their
interaction is more slippery or smooth than that of other metals, i.e.,
self-lubricating. No oil required. 

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802


  _____  


From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES
Sent: Tuesday, August 07, 2007 11:39 PM
To: Pianotech List
Subject: Re: Counter-bearing drag

 

Hey, Dean, another myth rears it head...

 

Brass, steel, and cast iron have quite different coefficients of friction
because of the way that the surface "galls" or wears down under compression
and the movement of one surface against another. What you're referring to as
"lubricating" is just a way of describing the friction differentials between
the materials. There's no oil, or lubricity, involved. 

 

Paul

 

"If you want to know the truth, stop having opinions" (Chinese fortune
cookie)

 

 

In a message dated 08/07/07 22:02:01 Central Daylight Time,
deanmay at pianorebuilders.com writes:

My understanding is from a chemical standpoint steel on brass is self
lubricating.

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802


  _____  


From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jude Reveley/Absolute Piano
Sent: Tuesday, August 07, 2007 10:10 PM
To: pianotech at ptg.org
Subject: Counter-bearing drag

 

Ahh, kinda late in the thread, but I've been thinking...oh no!

 

I'm looking to upgrade my string terminations on my rebuilds too like so
many of you cool guys and gals so my questions are:

 

1.	How do bend your half rounds to conform to any required sweep? Clamp
in a form? 
2.	Why brass? It is so soft, will get marred by the strings and
eventually tarnish?  Why not anondized aluminum or titanium? If it's a
question of economics, shouldn't we at least plate the brass? 

Thanks for any thoughts...

 

Jude Reveley, RPT
Absolute Piano Restoration, LLC
Lowell, Massachusetts
(978) 323-4545

 

 

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