consistent downbearing measurements

[Joe And Penny Goss]

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My thinking is that the angle of deflection of the speaking length and =
the hitch end, are more an indicator of down bearing than is the segment =
that crosses the top of the bridge. Might be in error here as this sure =
in not something that real experience has taught me <G>
To me it is Plane Geometry, and I may be looking at it from the wrong =
Angle.
Why did I not purchase one of those 'flame suits' when they were =
available. Conrad!
Joe Goss=20
imatunr@srvinet.com
www.mothergoosetools.com
  ----- Original Message -----=20
  From: David Skolnik=20
  To: Pianotech=20
  Sent: Thursday, June 03, 2004 4:52 AM
  Subject: Re: consistent downbearing measurements


  Joe -
  Returning, for a moment, to the piano aspect of this issue, what's =
your reason for bypassing the bridge?  You'd get your net, though, in =
the case of a rounded bridge surface, you could get a false zero or =
negative reading.  (I don't think you can get a false positive, at =
least, I can't visualize it.) Also, you'd learn nothing about the =
individual front and rear components.  That was part of my issue with =
John's method.  He seemed to have little concern for other than the net =
bearing, and even on that, he had some ideas I found somewhat troubling. =
Unfortunately, (or maybe fortunately for me) he's no longer contributing =
to these lists, so that's not an avenue to pursue.

  As for using a laser,  you'd STILL have to solve the stabilizing =
problem Greg spoke of.  Maybe you could come up with a Rare Earth =
Universal Mount, with which you could use a Lowell OR a Laser.  =
(LOLREUM!)  Are lasers affected by magnetic fields?=20

  But mainly I'm interested with my first question...why no bridge?


  David Skolnik

  At 04:42 PM 6/2/2004 -0600, you wrote:

    Humm,
    why would not a laser set on the string pointing at the rim, first =
measurment on the speaking length and the second reading on the tail =
with the laser pointed at the same target.  Bypass the bridge all =
together.
    Just thinkin,
    Joe Goss
    imatunr@srvinet.com
    www.mothergoosetools.com=20
      ----- Original Message -----=20
      From: Erwinspiano@aol.com=20
      To: pianotech@ptg.org=20
      Sent: Wednesday, June 02, 2004 3:53 PM=20
      Subject: Re: consistent downbearing measurements=20
           Greg=20
         Some techs do not rebuild but only use them to see if there is =
any residual bearing left in the 90 year old almost flat or flat  board. =
Under those conditions it's difficult to tell anything with the gauge =
because of the bridge slope towards the rear & a sunken crown/bridge as =
well  One gets really funky ideas of whats there &  not there if you =
know what I mean.=20
       As to your useage , yes of course this what they're for. I wasn't =
looking for trick answers. It would be nice if the gauge were fashione =
from cast brass or iron for a more solid seat on the string.=20
        Dale=20
      Dale,=20
              Uh, I'm not sure what type of an answer your looking for =
here but I'll take a stab at it. I'm needing to set plate height during =
the course of a rebuild and check for down bearing during the course of =
evaluating a piano. Isn't that what their for?=20
      Greg=20
      At 10:45 AM 6/1/2004, you wrote:
        In a message dated 6/1/2004 5:23:38 AM Pacific Standard Time, =
gnewell@ameritech.net writes:=20
        Thanks Dale. I've been doing just that but I'm not happy with =
the repeatability of measurements. There's just got to be a better way. =
Any other gauges out there? I seem to remember a Journal article with a =
dial gauge of some kind. Am I dreaming?=20
        Greg Newell


        Gregg
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