Fw: Strike angle (was Bore Distance)

[Erwinpiano]

Bill

 I believe upright hammer bore rake is induced so that the hammer can hit
the string without having the shank travel any further towards the upright
position which would slow repition.  On the uprights that have displayed
this problem for me,even with low friction and every thing regulated  the
return spring could not do all the work. So even though upright actions are
primarily (or More)spring operated for repetition they still require some
gravity to aid responsive shank return/repetition.

    Dale Erwin


----- Original Message -----
From: <Maxpiano@AOL.COM>
To: <pianotech@ptg.org>
Sent: Saturday, June 30, 2001 6:03 AM
Subject: Re: Strike angle (was Bore Distance)


> I've replaced shanks on many old uprights that had the hammer head at less
> than 90 degrees to the shank.  I would guess at 85 degrees on some, and I
had
> to go with that angle to make them fit and look right.  What was the
reason
> for this angle?
>
> An institution I serve has three Steinway 45 studios with hammers so
angled
> that, as they groove, are striking more and more on the "forehead" of the
> hammer than on the "nose."  I do not care for the sound of these pianos,
sort
> of nasty and twangy, not to speak of the abundant false beats.  Was the
angle
> intentional?  For what purpose?
>
> Bill Maxim
> Maxim Piano Service
> 212 Newpark Place
> Columbia, SC 29212-8666
> (803) 732-9225, FAX (803) 732-2641
> wmaxim@aol.com
>