Alans Puzzler

[Alan Barnard]

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Wow! 

But you know what? It's almost a shame to learn the proper engineering, physics, and mathematics of these things as it spoils the mysticism; takes away the magic. 

It's kinda like finding out there's no Santa Claus (which I hope never happens). 

So I guess you are saying that swinging a dead cat in a cemetery at midnight, burning incense, and chanting mantras are no longer valid piano repair techniques, eh? What's next, man will someday fly??? A pox on thy birdhouse. Hope your 440 Hertz!

So thanks for spoiling the fun—I suppose next you'll be telling us that the moon is not a vast potential source of freshly cultured butterfat!!!

Fie, fie, ye foreign-based, scientifikle fiend! Were ya here, we'd try ye for a witch.

Here in Salem, we don't coddle purveyors of unnecessarily alarmist futuristic wizardry, my friend, no siree ...

May your pudding fall. 

Alan Barnard
Advancing backwards in Salem, MO

> [Original Message]
> From: Ric Brekne <ricbrek@broadpark.no>
> To: pianotech <pianotech@ptg.org>
> Date: 11/05/2005 11:17:41 AM
> Subject: Alans Puzzler
>
> Hi folks
>
> Spent about 40 minutes today with my handy dandly grand action model 
> looking at what happens when the jack top is too high relative to the 
> window.  I can say pretty conclusively a high jack top in itself is not 
> going to cause drop to dissapear.  Nor should it really.  If you take a 
> perfectly regulated action and then lower the repition lever so that the 
> jack top gets becomes high in the window you've done essentially two 
> things. One; you have caused the jack to have difficulty returning under 
> the knuckle,  and two; you've cause drop timing to be delayed a bit.
>
> This is where the symptom may seem to occur.  If you have a very tight 
> regulation with regard to letoff to begin with, AND dont do insure that 
> lett off and drop engage at the same time, AND have the jack just a tad 
> high, then when when the jack trips the rep lever stays in motion and 
> the hammer <<falls>> whatever little distance the jacktop is high in the 
> window.... until the rep lever gets engaged.  There is one spot where 
> this appears like no drop.. looks to be when the jack is about 0.5 mm 
> over the repetition arm window.  But its largely an illusion as drop is 
> just smoothed out and melded into what is normal aftertouch motion.
>
> If you have letoff set a bit more conservatively to begin with... or if 
> you insure that the letoff button and jack button engage at the same 
> time... then drop occurs as usual regardless of jack top / rep lever height.
>
> Cheers
> RicB
> _______________________________________________
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