Fw: Pinbock thickness

[Erwinpiano]

  Hi David,

   Sounds like you've answered your own questoins and the ones I was asking
as well. Sounds like you have plenty of safty factor with original pin
length.   I'VE ALSO DONE THESE uuuggghhhh. Drilled and plugged with buduc
plugs in a 1873 stwy style 2.  The results were just like a new block and
whole lot easier than fitting the compound flange fit and dealing with all
that mortise garbage.  Who knows why the extra thickness. In this case it's
not needed and I can see no down side.  You didn't say how big or old this
beast is.


    Nice analysis.  Good luck
    Dale Erwin



----- Original Message -----
From: "David Renaud" <studiorenaud@qc.aibn.com>
To: <pianotech@ptg.org>
Sent: Monday, March 05, 2001 12:14 PM
Subject: Re: Pinbock thickness


> The original pins were only 2 1/4 inches with
> only 1"3/8ths of pin actually in the block.
>
> Open faced block inserts through top of plate(router job and fussy
> fitting)
> , so no extra pin height required to clear the plate.
> So if I use the same size pin I am safe with a 1"1/2 inch block.
> The only concern so far assume problems with cheating on
> pins depth but this is not the case. I can go with original size pins.
>
> I thought a potential problem would be reducing contact with the
> flange but the distance from the top of the block to the bottom
> of the flange is 1 1/2 inches.
>
> I'm not sure why they went with such a thick block except that
> they had insert cut outs into the plate, and wanted extra, so ordered
> thick stuff. But they did not take advantage of the depth with longer
> pins.
>
>                                              Dave
>
> Newton Hunt wrote:
>
> > A thinner block will yield less pin / block contact area.  Pi*D*H
> > where D=diameter and H=height.  Consider the total amount of contact
> > area of the pin in the regular block and the amount in the thinner
> > block.  Bear in mind you will have to use 1/2" shorter pins.  Now
> > figure the % difference.
> >
> > Other than that, as long as you have the plate height set right, there
> > will be little difference.
> >
> >                 Newton
>