[pianotech] 1983 Bluthner with Renner action

[Farrell]

Hoooo boy. I'm not really the action guru - I mean I've done some radical 
things to actions, but always only after quite a bit of head scratching!

Especially if you've replaced the action brackets (and I suppose even if 
they were original), I would be sure I have a good action spread - that's 
for sure. I'd want to look carefully at the relationship between the knuckle 
core, the jack top and the window in the rep lever - if the jack is aligned 
properly with the knuckle core, is there enough room in the window for the 
jack to clear the knuckle without getting buried into the felt at the end of 
the window? If that is too tight, it really won't matter what else you do 
with blow, etc. If that is too tight, then I suppose you need to look at 
knuckle placement, action spread, maybe even the design of the darn wippen 
assembly.

That's where I'd start anyway.

Maybe someone else has some more experienced input......

Terry Farrell

----- Original Message ----- 
From: "Rex Roseman" <rosemanpiano at gmail.com>
To: <pianotech at ptg.org>
Sent: Sunday, May 03, 2009 8:21 PM
Subject: Re: [pianotech] 1983 Bluthner with Renner action


Terry

I am working with a piano that may fall into the category that you are
describing. I had to replace the expanding action rails on a Wurlitzer and
when I regulated it with 1-3/4" blow and 10mm key dip the jacks hit the
cushion at the back of the repetition level window. My thought is to
increase the blow so that the whippen moves farther before let off,
therefore decreasing the range of motion for the jack. Is this a good idea
as per below, or do I need to revisit the action spread?

Thanks.

Rex Roseman

PS This is the first time that I have had to put new action brackets on a
piano and had to set up an action from scratch, so I am still somewhat
feeling my way through the process.


-----Original Message-----
From: Farrell [mailto:mfarrel2 at tampabay.rr.com]
Sent: Sunday, May 03, 2009 7:30 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] 1983 Bluthner with Renner action

<Snip>

As it has been written on this list many
times in the past, "let the piano dictate the regulation specifications".


<Snip>

If, by chance you are not aware of the process, I'll try at least to give
you a start. Start with the keys. Use the fallboard and keyslip as guides
for key height. Place action in piano and check blow range - can you adjust
somewhere in a 1-3/4" to 1-7/8" range? What kind of dip do you have with a
given blow - is it what you like? Adjust accordingly. Your strings will
dictate let-off and drop.

Terry Farrell