[CAUT] F..riction (rep spring)

[Delwin D Fandrich]

In the case of the Baldwin wippen I think the screw is located too close in
on the spring lever. About the only way they will work is to keep a lot of
friction in the repetition bushing. Way back when I did experiment a bit
with moving the screw out some which seemed to help some. But, since it was
one of those things that "no one ever complained about" there was little
interest in doing anything about it.

ddf

Delwin D Fandrich
Piano Design & Fabrication
620 South Tower Avenue
Centralia, Washington 98531 USA
del at fandrichpiano.com
ddfandrich at gmail.com
Phone  360.736.7563


-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Fred
Sturm
Sent: Thursday, December 02, 2010 6:50 PM
To: caut at ptg.org
Subject: Re: [CAUT] F..riction (rep spring)



Other springs, though, behave differently, and I'm not sure what to think
about them. In particular, Baldwin style (attached and screw- adjusted to
the rep, a coil in mid air, then in a jack slot) and Schwander. I don't work
with them much, but the last occasions I had to do thorough regulation, I
found that in tripping the jacks lightly (to fine adjust rep lever height),
the lever didn't want to support the hammer on most of them. I experimented
with increasing tension to the max and re-pinning both centers pretty heavy,
and the symptom
persisted: better, but the jack still wouldn't go back under the knuckle
when I tripped it lightly with a finger. In real life, they seem to function
just fine, and I don't experience misfires, but it does worry me. Makes me
glad most grands these days are butterfly.
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu