[CAUT] abel action centers seizing

Susan Kline skline@peak.org
Sun, 12 Jun 2005 19:47:13 -0700


<<You would think someone would be checking this stuff all along the way>>

I have always imagined that they missed it at the factory because it takes
quite a bit of playing before the center pins seize. Back many years ago
when I'd see a lot of seizing pins showing scoring where they touched the
bushing cloth I'd even save them in a baggy and send them to the company's
technical support. I figured that however distant the possibility, I
ought at least to try to get the evidence back to the factory techs. No sign
it ever got there, or did any good.

Other problems which show up later, and not at the factory: goop used as
lubricant on the keybed under grand action glides, turns to rubbery substance,
with drag and noise. Rubber buttons -- fall out. Rubber lining grand pedal
rod cups and upright pedal rod grommets ... noisy, wear through easily, turn
to black goo if lubricated, can walk up the pin, causing dampers to stay
off the strings. Teflon sprayed coating in place of spring punchings on 
upright actions --
this one really irritates me -- NOISY, and it wears through. The old cloth
spring punchings worked perfectly for many years and absorbed sound. The
teflon housing for upright pedal trapwork -- seems slippery, but can get a
glaze and make an awful squeal. Luckily teflon tolerates lubricants like
VJ lube or graphite, but you have to lever the housing open, since it snaps
shut -- so far I haven't broken one. In general, I think that teflon is
very over-rated for noise abatement. I wish Steinway would go back to the
cloth-bushed center pin for the repetition spring post, even if one can
tweak the rep spring at the teflon post to eliminate the click -- for awhile.
Teflon has one fatal weakness for most of the jobs it is given to do in piano
actions these days -- it can't absorb sound.

Well, enough pet peeves for today -- anyway, all this stuff works perfectly
in the factory, but in the field tends to fail or make a nuisance of itself
within a couple of years.

Susan Kline


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