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MMD > Archives > June 2015 > 2015.06.11 > 01Prev  Next

Woodruff Key in Player Piano Transmission
By Jon Page

I'm trying to get a Sterling upright working.  It was restored well
but the reroll failed.  At first I thought it was the retrofit reroll
pneumatic not getting enough vacuum but I discovered the problem in
the transmission.

The take-up spoon brake also doubles as the roll drive clutch.  It
slides along the shaft on a metal insert.  The insert is ~2 mm square
stock.  The piece that caused the jamming is 'L' shaped, 15 mm by 5 mm.
The short arm fits into a hole in the shaft and it rotated in the hole
to cause the jam.

I suspect there was another 5 mm arm on the other end to stabilize it
on the shaft.  It sits on the shaft and not in a slot.  I'll have to
take it apart to see if there is a corresponding hole on the shaft
under the brake (the long end of the slide looks like a brake).

Jon Page

(Message sent Thu 11 Jun 2015, 16:33:32 GMT, from time zone GMT-0700.)

Key Words in Subject:  Key, Piano, Player, Transmission, Woodruff

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