New Bearing Gauges that don't lie

[David Love]

Probably from Schaff.  

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Greg Newell
Sent: Wednesday, June 14, 2006 8:48 PM
To: Pianotech List
Subject: Re: New Bearing Gauges that don't lie

David,
         Where'd you get the gauge?

Greg Newell



At 10:44 PM 6/14/2006, you wrote:
>This is the method I prefer for a quick check of downbearing.  It's a
>modified dial gauge and the three feet are 1 inch apart.  When set on a
>level surface the needle points straight down to 6:00.  Each increment on
>the gauge is .001".  So when set over the bridge with the center foot
>centered on the bridge and the outer feet on the front and back scale, it
>gives a very quick reading of the total bearing (sine(1o) = .018.  The
photo
>shows about 1 degree of residual bearing.
>
>Of course, it's relatively useless for setting up bearing on an unstrung
>board but so is any other gauge.  My latest foray is to use my ribscale
>spreadsheet for calculating the amount of total deflection under load and
>predetermine the bridge height based on calculations (I just hate cutting
>those stupid little slots and pulling strings around).  I still use a
string
>and a square to determine whether the bridgetop is square and canted
>properly front to back when I do the dry fitting.  My final adjustments
come
>from using an adjustable plate perimeter mounting system.
>
>David Love
>davidlovepianos at comcast.net
>www.davidlovepianos.com
>
>
>

Greg Newell
Greg's Piano Forté
mailto:gnewell at ameritech.net
www.gregspianoforte.com