Grand Jacks

[AlliedPianoCraft]

I'm happy to see that there is another "old timer" on this list who uses the term "rolling the flies". I'm not alone.....I'm not alone....

Al Guecia


From: Porritt, David 
Sent: Sunday, August 17, 2008 6:52 PM
To: Pianotech List 
Subject: RE: Grand Jacks


Repetition lever set too low.  What you did was the way to check the repetition lever height.  Old timers call that "rolling the flies".  If you trip the jack and you just barely feel the top of the jack scrape the knuckle but it does return fully on its own, the rep height is correct.  The tightness of the jack bushings is another matter.  They should be pretty free.

 

dp

 

 

David M. Porritt, RPT

dporritt at smu.edu

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Matthew Todd
Sent: Sunday, August 17, 2008 5:41 PM
To: pianotech at ptg.org
Subject: Grand Jacks

 

I have been observing a grand action, and I was curious about something (is that a surprise??)

 

A)  I went and tripped each jack toe and I noticed that some of them when I tripped the jack toe down, and then released it, the toe immediately went back up.  B)  On others, I tripped the jack toe, and when I released it, the toe went up, but not fully, and I would gently push the toe and would feel the "click" of the toe returning to it's position.  C)  And yet, on a few others, when I pushed down the jack toe, and then released it, the toe would stay down (assuming a tight flange here).

 

What should be the consistency with each note?  I'm assuming, after I trip the jack toe and release it, the jack should return fully to where it began.  What other problems can there be besides tight flanges to have the jack not return fully?

 

Thanks,

Matthew
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