Jack pinning...do they bend?

[Dean May]

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Bergman is a Young Chang product and you will frequently encounter this =
problem of hammer centers tightening on YC products. It is residue from =
the felt. Ream and repin the ones that are bad. Protek all the rest.=20
=20
To see which ones are bad, lift all the hammers up to vertical. Then =
start lowering them to the rest rail, watching to see when gravity will =
overcome the friction. You'll be able to see which ones are really bad, =
as they will go down to quite an angle before gravity will get them. =
When friction is about right, hammers should fall when they come off =
center, about 75 degrees.
=20
Dean
=20
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802
=20
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On =
Behalf Of Dave Davis
Sent: Saturday, July 03, 2004 5:16 PM
To: pianotech@ptg.org
Subject: Jack pinning...do they bend?
=20
Hi All,
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Is it possible for jack center pins to be bent on a hard blow? I service =
a Bergman TG150 (5'0") that is played very hard, and some of the jack =
pinning is getting tighter. At first I thought it might be tight =
bushings or an adult beverage spilled inside (bar scene), but I'm =
thinking the pins may be bending. The piano is 7 months old. I don't =
think the problem is a pin plating problem or graphite in the bushing =
felt.
=20
Dave Davis

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