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Hi Ric,
3mm is outside of the box for most manufacturers, for spec
regulation. A good concert reg would be 2mm let off and 1mm drop if all
action parts are sound. Good hammer tailing and rep springs must be
regulated to a professional level.
I also look for 1/4" checking on a concert reg. Friction in the rep slot
is also critical.
Now I feel better having stirred the pot <G>
Regards Roger
>Over to Jim Hudsons article tho... Dont you think a whole 3 mm letoff is a
>bit overkill on the safe side ? Where do you generally like letoff and
>drop yourself, and why ?
>
>Interesting to find so much variance in this seemingly simple point.
>Cheers
>RicB
>
>
>
>James Ellis wrote:
>
>>This is one I can't resist, so I am going to jump in here with my "two
>>cents worth" (No, it's not about tuning).
>>
>>"PRACTICAL CONCERT WORK" by Jim Hudson, June 2004:
>>
>>What no one seems to have noticed is the word "Practical" in the title.
>>That sets the tone for the whole article, but some readers did not seem to
>>hear it. Fred Sturm says he prefers to set let-off at 1/32 inch. Well, I
>>don't. If I set it like that, I'd be in trouble for sure. That's right at
>>the very edge of blocking, and even if it does not block outright, it does
>>not produce a clean let-off, and that results in occasional bizarre sounds
>>when the hammer does not completely clear the very first-half cycle of the
>>strings vibration. David Love says setting let-off like this is
>>"dangerous", and I agree. Otto Keyes says "consistency" is what one should
>>strive for, and I agree with that too. But if you regulate to a "gnat's
>>eyelash", Bill Garlick has said you better stick around for the concert.
>>True, but that might be too late.
>>
>>In all this nit-picking with Jim Hudson's article, did no one mention drop
>>regulation? If you want consistent response for playing very soft
>>passages, you had better pay close attention to that too, as well as to
>>consistency in the regulation of the repetition springs, and everything else.
>>
>>"MAGNETIC ASSIST FOR GRAND PIANO ACTIONS", by Richard Brekne, June 2004:
>>
>>With all this interest in nit-picking Jim Hudson's article, am I the only
>>one who has taken a special interest in Brekne's article? This is really
>>neat! It is innovative. It is clever. There are other magnetic touch
>>systems around, but this one has something clever that the others don't.
>>One of the first questions that popped into my head was the non-linear
>>decrease in magnetic repulsion as the two tiny magnets move farther apart
>>as the key moves. Richard takes care of that by suggesting a second pair
>>of magnets behind the capstan, which would be attracting. Thus, the
>>non-linear repulsion of the first pair would be compensated by the opposing
>>non-linear attraction of the second pair. Very clever indeed!! In other
>>words, the combined effects would apply a measured force tending to rotate
>>the front of the key downward and the wippen upward around a pivot at the
>>point where the capstan touches the wippen cushion. Since the capstan
>>never leaves the wippen coushion, the action ratio is not changed. All
>>that happens is that the need for lead in the fronts of the keys, and the
>>moment of inertia is reduced, without the use of springs. The thing to
>>watch out for here will be that the spacing of the magnets will need to be
>>regulated as the capstan depresses farther into the wippen cushion over
>>time. This, in my opinion, is very clever and very innovative, and I for
>>one would like to see how it all plays out in the end. Congratulations,
>>Richard!
>>
>>Sincerely, Jim Ellis
>>
>>
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>>
>>
>
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