Pinning and Tone

[Alan McCoy]

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Hi Bob,

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.

Do you have a different method to test for firmness of bushings?

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

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