[pianotech] Regulating drop and controlling semantic drift

Israel Stein custos3 at comcast.net
Thu Nov 26 11:59:21 MST 2009


Wed, 25 Nov 2009 11:49:59 -0500 Chuck Raynor <diggeray at comcast.net>
> Hi list,
> I've been reviewing my notes from "Are You Regulationally Challenged?" which was presented at Grand Rapids this summer (great!!) and remembering a few other comments I heard, and have a few questions.  In that class we were taught to set the drop screw to attain "simultaneous escapement"--essentially that the jack toe would hit the button at the same time the rep lever hit the drop screw, which results in a very small drop.  On several grands I've tuned recently, I noticed that there was WAY more drop than that (and way more than the maximum 1/8" than I would normally expect).
> I guess my question is "what's the purpose of drop?"  Israel Stein says "so you know you have letoff".  Will too large a drop effect repetition?  Will it also effect the touch of the piano?  That's my thinking, but I'd love the input of the experts so I have it firmly (and correctly) in my mind.
> Thanks,
> Chuck Raynor
> Raynor Piano Service
> St. Helena Island, SC
>   
Well, well,

I thought I might stay out of this one, especially since my name was so 
prominently mentioned (though the quote is a bit out of context, I might 
say) but the latest exchange of messages prompts me to attempt to clear 
up what I see is a big misunderstanding.

Mr. Raynor's question is: "what's the purpose of drop?"

Most of the very eloquent, expert and detailed answers posted answer a 
very different question, that is "what is the function of the drop screw".

It seems to me that Mr.Raynor is asking a much more focused question: 
"Why is it that we want to see the hammer drop after letoff (that is, 
why do we make rep lever escapement occur slightly before jack 
escapement) when we regulate the action - and not simply regulate it so 
that jack escapement and rep lever escapement occur simultaneously as 
Rick Baldassin seems to recommend".  (Nowhere is the possibility of 
reversing the order entertained)..

To this question, my answer is "so that the exact point of letoff is 
visible". The only other direct answer to the question phrased this way 
that I have seen so far is one provided by Ed Foote, who writes that 
slightly staggering the points of jack escapement and drop screw 
escapement actually leads to a smoother "feel" than having therm occur 
simultaneously. I suppose this should be obvious to every one of us who 
regulates harpsichords - where we stagger the plucking points on 
multiple string choirs for precisely the same reason. Thanks , Ed, for 
pointing that out - never thought of the two being related. So I suppose 
this contradicts Baldassin's claim that simultaneous escapement is the 
most desirable way to regulate (at least theoretically). As to which of 
the two is really optimal, well, that question makes me think of 
quantities of angels dancing on the head of a pin or something of that 
order...

Of course, Ed's reason would not mandate that jack escapement occur 
after rep lever escapement - a stagger in either direction would reduce 
the load. But that possibility was not suggested or implied in Mr. 
Boyce's question. So all the explanations about "keeping the hammer out 
of the strings" and "staying outside the string vibrational envelope" - 
while valid - are rather beside the point. But since they were brought 
up, I would like to point out that, in terms of the regulation process, 
we don't really "keep the hammer out of the strings" by regulating drop. 
We actually regulate letoff to be outside the string vibrational 
envelope, and then if drop is correctly regulated in relation to letoff, 
the desired result is achieved automatically. I know this is just 
semantics - but it is important to be very precise in one's language 
when trying to teach beginners - or all kinds of misunderstandings can 
occur.

Mr. Boyce follows up with the question "how much drop" - that is, how 
far below the point of letoff is it OK or desirable for the hammer to 
drop". The simple answer to this - which I usually give when dealing 
with basic regulation is: "as little as possible". Which satisfies both 
reasons for visible drop given above - that is, there is absolutely no 
reason to make visible drop (or the stagger between rep lever and jack 
escapement) any larger than what is necessary to see the exact point of 
letoff - or to stagger the load during escapement. This is what Mr. 
Baldassin refers to in his statement:  "drop affects nothing" - that the 
exact amount of drop has no effect on any other regulation 
specifications, so the exact amount really doesn't matter for purposes 
of getting everything to work properly. Points up another danger of 
quoting out of context (or  - for that matter - of making broad 
statements without qualifiers.) So the entire dustup between Steven Hopp 
(quoting Baldassin) and Rick Breckne appears to be apples and oranges - 
Hopp/Baldassin are talking about the amount of visible drop, and Brekne 
is talking about the function of the drop screw and why rep lever 
escapement should occur before letoff escapement. This is why semantics 
are important...

Just one more comment. I wonder how useful it is to throw a whole lot of 
information about fine concert regulation at someone who is just trying 
to learn the basics. The sort of skills that are needed to do the sort 
of regulations I have seen described in this thread come with 
experience, repetition and loads of trial and error - to develop the 
"feel" for the action and its function without which any attempt to 
regulate on this level is sure to result in disaster - or at least in  
repeated callbacks. Hell, I can remember myself fresh out of North 
Bennet Street School trying some of those fancy tricks on my first few 
regulations - and suffering the consequences. Sometimes I think that the 
reason folks have trouble learning regulation is not because of lack of 
information, but due to information overload.  End of semi-rant.

Happy Thanksgiving

Israel Stein






More information about the pianotech mailing list

This PTG archive page provided courtesy of Moy Piano Service, LLC