Agraffe Counterbore Tool

[David Love]

Grinding the v-bar runs a risk of grinding through the hardened portion that
is crucial for clean termination.  Wouldn't recommend that.  I don't see any
problem with changing hammer bore for each section.  It's fairly common for
pianos to vary from the bottom of the tenor to the top of the treble (not to
mention bass and treble differences).  Often it's a gradual change (as in
Steinway), but sometimes not.  I can't imagine we are talking about much
difference hear.  There is a limit to how much you can effectively grind off
an agraffe to effect a change.  I don't see any real benefit anyway.  The
simplest solution is often the best.    

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Frank Emerson
Sent: Thursday, May 24, 2007 9:44 AM
To: Pianotech List
Subject: RE: Agraffe Counterbore Tool

 

I agree with Terry that it would be preferable to keep the hammer bore as
consistent as possible.  In manufacturing, the counterboring is done on CNC
machines.  It would be very difficult to keep the counterboring consistent,
resulting in the strings being in a consistent plane, even if you do get it
closer to the treble plane.  Would it be easier, and more even to grind the
v-bar to raise the treble, rather than lower the tenor?  Is there room to
lower the plate a bit to compensate?

 

Frank Emerson

 

 

----- Original Message ----- 

From: David <mailto:davidlovepianos at comcast.net>  Love 

To: Pianotech List <mailto:pianotech at ptg.org> 

Sent: 5/24/2007 10:31:00 AM 

Subject: RE: Agraffe Counterbore Tool

 

Pretty hard to make any significant difference without major grinding of the
agraffes.  I'd simply adjust the hammer bore assuming that the bearing is
not at issue. 

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Farrell
Sent: Thursday, May 24, 2007 6:59 AM
To: Pianotech List
Subject: Re: Agraffe Counterbore Tool

 

To get my tenor string plane down to the desired elevation (that of the two
top treble sections). I know I can simply adjust the hammer boring, but I
wanted to get all the long bridge sections (plain wire) as close to one
plane as I reasonably could.

 

Terry Farrell

----- Original Message ----- 

From: David Love <mailto:davidlovepianos at comcast.net>  

To: 'Pianotech List' <mailto:pianotech at ptg.org>  

Sent: Thursday, May 24, 2007 9:26 AM

Subject: RE: Agraffe Counterbore Tool

 

What's the situation that you need to grind down the agraffes?

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

have been happy with it.

 

But my current project needs to have all its new agraffes ground down a fair
bit. I do not relish grinding all these agraffes by hand. I would love to
put this thing in some slow turning machine and grind my agraffes that way.
But what machine? I wish I could chuck it into my 1/2" drill press. This
thing just reeks of some special purpose to the taper, etc. - what the heck
is it supposed to mount in?

 

Thanks for any ideas/input.

 

Terry Farrell

 

Terry Farrell
Farrell Piano

 

www.farrellpiano.com
terry at farrellpiano.com

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