Baldwin accu-hitch pins

[Erwinspiano@AOL.COM]

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In a message dated 1/17/2002 9:48:41 PM Pacific Standard Time, 
RNossaman@KSCABLE.com writes:


> Subj:Re: Baldwin accu-hitch pins 
> Date:1/17/2002 9:48:41 PM Pacific Standard Time
> From:<A HREF="mailto:RNossaman@KSCABLE.com">RNossaman@KSCABLE.com</A>
> Reply-to:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> To:<A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
> Sent from the Internet 
> 
>    Ron ,David

   Ok I still don't get it!  Nothing about what has been said so far about 
adjusting the bearing on acujust makes much sense to me. It sems to be 
arbitrary Compared to the way I ( and many) set  bearing on new boards using 
a prestressed method  there is a good deal of predictability in the outcome 
but with this, how will you ever know if there is some kind of even , uniform 
and adequate bearing to produce a tone worth listening to without impedance 
problems?
   The obvious & possible upside to this is, if I can get a grasp of it, is 
that one should be able to find the sweet spot of compression for each 
individual sound board a thereby maximizing tonal potential. I've done this 
with the Coleman plate suspension system with success. The system allows for 
plate elevation adjustment with the piano at pitch. I.E. set up what seems to 
be a reasonable amount of bearing and adjust it up or down checking the tonal 
output as you go.
  I think that it is worth knowing that you can totally screw up the outcome 
of a new belly job just by getting the bearing set unevenly. Meaning tonal 
weaknesses and (splatty) impedance problems in certain registers. ASK ME how 
I know!!!!
    Ron (somebody) tell me what I'm missing on the acujust in a way I can 
absorb it. What's that you say? not possible. hmmmmmmm
       
       Dale Erwin

> 
> 
> >
> > I recently assessed a Baldwin D with accu hitch pins.  After measuring 
> the
> > bearing in several places I found that the piano generally was set up 
> with
> > negative rear bearing (Lowell Gauge).  I am considering adjusting the 
> rear
> > bearing in order to get the overall bearing where I want it.  What is the
> > general procedure for doing this?  Does one measure each string in each
> > section?  Or is there a way to set the end strings, for example, of each
> > section and somehow put all the strings on the same plane?  Do you have 
> to
> > let off the tension to move the string down (in this case) the hitch pin? 
>  Or
> > can I just tap it down with a brass rod?  Input is appreciated.
> >  
> 
> > David Love
> 
> Hi David,
> You don't really need to measure each and every string. Set maybe four in 
> each
> section with the gage and eyeball the rest. Spot check occasionally to see 
> how
> closely your eyeball calibrates, adjust accordingly, and trust the average 
> to
> get you well within close enough. Close enough is, after all, close enough.
> Your judgement is as good as anyone elses. It is done at full tension, goes
> more quickly than you expected, and will probably leave you wondering why 
> you
> were concerned about it in the first place. It's a very nice system - which
> will come home to you the next time you have to set bearing again in the
> "usual" way. A mild steel or brass rod with a hole drilled in it to 
> accommodate
> the hitch pin diameter works just fine to knock them down.
> 
> Piece of cake.
> 
> Ron N


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