FW: Pinning and Tone

[Don Mannino]

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Alan,
=20
The tone of the piano can be the best gauge, as poor pinning has a
pretty distinctive sound to it.  I would describe it as a thin and weak
tone.  Checking the friction level in a thin sounding note, repinning
it, and listening will tell you a lot.
=20
Experience is the best teacher here.  I don't have a specification to
tell you, except firm enough by feel and a good solid tone by ear.  I
suppose the engineers could give you a spec, though.  X amount of
deflection with Y amount of force applied Z distance from the pin.
=20
Don Mannino
=20
=20
-----Original Message-----
From: Alan McCoy [mailto:amccoy@mail.ewu.edu]=20
Sent: Tuesday, October 21, 2003 1:24 PM
To: College and University Technicians
Subject: RE: Pinning and Tone



Hi Bob,
=20
Well OK. Thing of it is, do you know the specs here. How much deflection
per how much side pressure? I'm guessing that the only test people
really use to check side play is the old screwdriver blade, or brass
rod, under the shanks gang style to check for winking hammers indicating
a loose center pin bushing. This is a good test, but it is neither
definitive nor quantitative, right? Also, whether a loose center shows
up on this test depends in part on how smooth the rod is as well as how
loose a bushing is.=20
=20
Do you have a different method to test for firmness of bushings?
=20
Alan McCoy

-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]On Behalf Of
BobDavis88@aol.com
Sent: Wednesday, October 15, 2003 2:21 PM
To: caut@ptg.org
Subject: Re: Pinning and Tone


In a message dated 10/15/2003 11:33:43 AM Pacific Standard Time,
amccoy@mail.ewu.edu writes:



But how does one test for firmness in any
quantitative, definitive way?




I'd say with side play. That's what Steinway is doing in addition to
friction measurement: measuring the amount of deflection with a known
amount of side pressure. Same objection - it only measures both sides at
once, but it provides a go - no-go gauge.

Bob Davis=20


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