key leads !!

[David Love]

Keith:

These are good points and ones that I considered.  Fortunately, because of 
the location of the missing lead, a 3 gram differential between the 1/2" and 
9/16" lead will only make a difference of 1.5 - 2 grams in the downweight.  
Because the hammers were recently given a good filing (by me) to remove a 
few decades worth of string grooves, much of that weight may have been 
compensated for.

David Love


>From: kam544@flash.net
>Reply-To: pianotech@ptg.org
>To: pianotech@ptg.org
>Subject: Re: key leads !!
>Date: Sat, 10 Mar 2001 22:50:20 -0600
>
> >.The only issue at this point is whether I can find a 9/16" lead as
> >originally came out of the piano, or whether I will have to expand a 1/2"
> >lead to fit the hole...
> >David Love
>
>David, LIst,
>
>For some reason I got interested in your dilemma, maybe because I use to
>own a Hazelton Grand and felt it was a nicely made piano.
>
>So some information for you about using 1/2" leads:
>To get it to a 9/16" diameter makes the width change from  3/8" to 1/4"
>width.  Also a 1/2" lead weighs 14 + grams and a 5/8" lead weighs 21 +
>grams.
>
>Some basic math indicates you will be 3 grams shy per lead using a 1/2"
>lead, which will not return the piano to your customer's desired target.
>
>The alternative, in part, would be what Terry Farrell suggested:
>=====================================
>Date: Thu, 8 Mar 2001 13:11:09 -0500
>From: "Farrell" <mfarrel2@tampabay.rr.com>
>Subject: Re: key leads
>
>Or plug and use exact size/placement of lead (s) needed.
>======================================
>
>To truly achieve the target, you might be able to do one of two ways.
>
>1) Plug the holes, then take two 3/8" leads, each weighing 8 + grams
>equaling 16 ++ grams, which is very close to the desired weight, piggyback
>them, place them above the plug and measure DW (downweight) with gram
>weights.
>
>Then remove the 3/8" leads and determine where you can place either a 5/8"
>lead or a 1/2" lead, whichever you choose to use, to approximate the same
>DW readings.
>
>2) Or you could plug and install two (2) 3/8" leads side by side where the
>plug is.  That would probably be easiest as you wouldn't have to take DW
>readings.
>
>The only thing I can see preventing you from installing new leads using
>either of these approaches is if there are already leads in the keyarms
>that would prevent you from installing the new ones.
>
>Some other ideas anyway.
>
>Keith McGavern
>Registered Piano Technician
>Oklahoma Chapter 731
>Piano Technicians Guild
>USA
>
>

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