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MMD > Archives > December 1996 > 1996.12.05 > 13Prev  Next

Re: Bobbling hammers
By Jon Page

This occurs because the key or pneumatic has not pushed the wippen through sufficient travel for the jack to clear the hammer butt.  First check distance of hammer from string; depending on the manufacturer:

    spinets - 1 5/8"; uprights - 1 3/4 to 2".

Take up lost motion with the capstan screw.  Level and set the dip on the keys. Dip is usually 3/8 inch.  Adjust backchecks, letoff and dampers. Check hammer springs for sufficient tension.  Are the bridle straps torn?

Adjust player pneumatics to wippens.  Adjust pneumatics stop rail to allow equal travel of wippen as key dip.

If one tech has not done this properly, call him back to get it right or get another.

Jon Page
Cape Cod. Mass

(Message sent Fri 6 Dec 1996, 01:38:22 GMT, from time zone GMT-0500.)

Key Words in Subject:  Bobbling, hammers

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