[pianotech] New keyframe

Chuck Behm behmpiano at gmail.com
Wed Nov 11 19:50:32 MST 2009


>I'm guessing that the rodent contamination has also ruined the balance rail
key bushings.  I'm also guessing that there maybe rust at the bottom of the
balance pins, potentially enlarging the balance hole in the bottom of the
key, once pulled free of the rust.  If these are the case, I would consider
the following.

Route a channel in the bottom of the keys to install a new hardwood boot at
the balance rail of each key.  Drill through the old front rail (not the
balance rail), with a drill small enough to just mark the location in the
new front rail pins without enlarging the old front rail holes.  Assemble
the new front rail to the other members of the new keyframe.  Install front
rail pins, rebush only the front pin bushings in the keys.  If you are
replacing key buttons remove the old buttons.  If you're only rebushing,
remove the old bushings.  Maybe a section at a time, place the keys on the
new keyframe, clamped to the frame and to each other, insuring proper
spacing and alignment to the action scale.Drill from the top through the new
key boots and balance rail in one operation.  Use stops to insure the
natural balance pins are in a perfectly straight line, and the same for the
sharps.

This allows you to redrill the keys and drill the balance rail together for
perfect alignment.  That's a lot of work, but it sounds like you are up to
it.  On the other hand, is the piano worth it?

Frank Emerson<

Frank - This sounds like a very practical and doable plan of action, plus
it's a new procedure to try, which I always enjoy. I'll let you know how it
turns out.

The piano by the way is a 10k restoration - much sentimental value to the
owner. He understands what he could buy in the way of a new piano for that
sum, and chose to have this piano worked on. His intention is to have the
piano transported to his fishing lodge in Minnesota on Leech Lake. In that
setting, I think it will be a great piano.

 I gave a list of what I knew needed to be done (we did agree on a few cost
cutting limitations - shimming the original soundboard as opposed to a new
soundboard, hand-fitted molded keytops as opposed to ivory, etc.), and told
him that in addition to the listed items, for that amount I would cover
whatever else I ran into along the way. As far as the price is concerned,
there would be no surprises.

 At this point, with the amount of work already involved, and as nice as it
is shaping up, I don't want to leave something unattended to that needs
attention. It's really my fault that when I looked at the piano in the
factory where it was being stored, I didn't dig down to the bottom of the
mouse debris to ascertain the condition of the keyframe. Oh, well. Live and
learn. Chuck
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