About Checking

[William R. Monroe]

Also tried varying the backcheck height, which showed no noticeable
improvement with either higher or lower backchecks.  Also tried changing the
backcheck angle - again no improvement one way or the other, hammers simply
will not check on soft blows.

Lost in Wisconsin:
William R. Monroe
Madison, WI
Assoc.


----- Original Message ----- 
From: "William R. Monroe" <A440WRMPiano@tm.net>
To: <ilvey@sbcglobal.net>; "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, November 09, 2004 7:32 PM
Subject: Re: About Checking


> The tail shape is right on (thanks Renner).  I had the Renner shop do the
> shaping, arcing, roughing bit.  I'm not ready to tackle hanging hammers
yet,
> so I had them hang a set for me on new shanks, flanges, with all the prep
> work, leaving me to concentrate on regulation stuff.  Any other ideas from
> the "list" as to what would cause this checking problem?
>
> William R. Monroe
> Madison, WI
> Assoc.
> ----- Original Message ----- 
> From: "David Ilvedson" <ilvey@sbcglobal.net>
> To: <pianotech@ptg.org>
> Sent: Monday, November 08, 2004 9:55 PM
> Subject: RE: About Checking
>
>
> > Go to http://ptg.org/    Click pianotech archives and search hammer
> checking.   Make sure your hammer tail shape is right...i.e.  a 2&1/2 to 3
> inch radius.   Do the tails come down flat and then angle sharply in at
> about 25 degrees?  Wrong shape=poor checking.  The simpliest thing to do
> when you have existing hammers to deal with is take ruler or better yet a
> protractor and look at what circle with a 3 " radius looks like.    That
> curvature shape is what you are after, what the shape of your hammer
should
> look like from the side.   Clamp a section of hammers up on a block so
they
> are above the backchecks and you won't put undue stress on the centers.
> Take a drill with a sanding disk and 60 sandpaper.   If you carefully run
> along the hammer tails you can duplicate that shape and make a BIG
> difference in checking.    1st even out the ins and outs of the hammer
tails
> coming from poorer hammer hanging, then start bringing down the angle,
> smoothing it out.
> >
> > David I.
> >
> >
> > ----- Original message ---------------------------------------->
> > From: "William R. Monroe" <A440WRMPiano@tm.net>
> > To: Pianotech <pianotech@ptg.org>
> > Received: Mon, 8 Nov 2004 20:11:55 -0600
> > Subject: About Checking
> >
> > >Hi List,
> >
> > >I've a small grand that I'm regulating (mine) and I'm struggling with
> > >checking.  Just finished regulation, and everything works well except
> > >checking.  Checking is nice and even throughout from a medium blow on
up
> at
> > >15mm.  I've double checked things like:  repetition spring tension -
> > >definitely not too strong; escapement - jack is clearing knuckle
> > >sufficiently; backcheck height and angle seem right.  I guess my
thoughts
> > >now lean towards, maybe backchecks are too low?  I can get checking on
a
> > >soft blow by decreasing the checking height from 15mm to about 8 or 9,
> but I
> > >just don't like it that close.  Thoughts? and Thanks.
> >
> > >William R. Monroe
> > >Madison, WI
> > >Assoc.
> >
> >
> > >_______________________________________________
> > >pianotech list info: https://www.moypiano.com/resources/#archives
> >
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
> >
>
>
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