THUD

[Fred Sturm]

I've had the slap of jack against hammer flange recently. Only occurred
on fortissimo, but was the devil to diagnose. It certainly didn't look
like it would happen with the frame/action out on the bench. I chose to
cure by a little of everything, particularly:
reduce keydip on offending keys just a tad
lower hammers just a tad
shave a bit of wood off the bottom of the flange tongues
tell the pianist not to play so darned loud (Hah!)
	Less spongy front rail punchings would also help. I did a couple more
things, but disremember at the moment.
Fred Sturm
University of New Mexico

John D. Chapman wrote:

> 
> However, you may be right about the jack slapping against the tongue of
> the hammer flange.  That would produce the right kind of noise, and,
> if the action rails were slightly out of line, would
> explain why the noise is in those four consecutive notes at the end of a
> section, and no other notes.
> 
> The jack is not digging into the repetition felt when the key is fully
> depressed, but it might still be slapping the flange tongue when the note
> is played.
> 
> How would you correct this problem?
> 
> John Chapman
>