Baldwin accu-hitch pins

[Erwinspiano@AOL.COM]

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In a message dated 1/19/2002 4:32:49 PM Pacific Standard Time, 
RNossaman@KSCABLE.com writes:


> Subj:Re: Baldwin accu-hitch pins 
> Date:1/19/2002 4:32:49 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 
> 
>   Thanks-- Ron, Dave I get it.  whew and alls right with the world

   Dale

> 
> 
> >
> > Hi Ron
> >   Ok I get this sort of but the place where I'm hung up is that as you 
> start
> > driving the strings down on the hitch your bearing increases as does the
> > amount the board is compressing as you go. Just like in pitch raising. So 
> how
> > do you know when enough is enough and when do you know that there is 
> enough
> > ,of the desired deflections so often discussed. Meaning a 1 to 11/2 
> degree
> > angle of deflection depending where in the scale we are talking about.
> 
> 
> Ok, I get it. How can you tell where to set the plate and aliquot height 
> with a
> more "usual" system? If you can set the plate and aliquot height to produce 
> the
> bearing you want in a conventional system when the strings go on, you can 
> do
> exactly the same thing with the vertical hitch pins. When you are strung 
> and at
> tension and start to set the bearing, you can drive all the sections down 
> to
> almost where you had anticipated they would finally be to pre load the 
> board.
> You know about where that final height is expected to be because you set 
> the
> plate height to put them there, like you would with aliquots. Then, unlike 
> with
> the aliquot system, you can do an adjustment pass for the final height and 
> put
> them just where you want them. There is already enough load on the board at
> that time to not make much difference in deflection from small bearing 
> changes
> in sections. Spot check after, and tweak sections as necessary. I start in 
> the
> low tenor and work toward the treble, and haven't had any problems at all 
> with
> the system. It might take two passes to get them where you want them, but 
> it
> goes quickly.
> 
> >
> >  Once again how could a person possibly know what the final position is?
> 
> 
> Just like you know that the plate and aliquot setting you decided on will
> produce the bearing you want. It's the same process.
> 
> 
> 
> >
> >    My answer so far is that you can't. Its more of a guesstimate than I'm
> > willing to make until somebody can give me some clarification.
> >   Does this help to see my angle of deflection!!!!!!!
> 
> 
> Why would anyone set a bearing angle on an unloaded board without 
> compensating
> for expected deflection, with either vertical pins or aliquots? Of course 
> you
> anticipate the deflection when you set bridge/plate height! Who said you
> didn't? Maybe I didn't say it so pretty good. When establishing bearing 
> before
> stringing, you do just what you always do. You either pre load the board, 
> or
> have a pretty darn good idea how far it is going to deflect under load, and 
> set
> bridge/plate height to accommodate it. Vertical hitch pins don't change 
> that
> process one bit. The only difference is that your back scale termination 
> that
> determines the final loaded bearing angle is not the top of an aliquot, but 
> a
> spot about 4mm up the hitch pin. The vertical hitch system isn't something
> magic that fixes any random thing that might be done wrong in the setup. 
> You
> still have to pay attention and set the thing up correctly.
> 
> Ron N


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