madelyn mrykalo wrote: > John, > Please define the term you used recently in one of your posts, which you > called REFLECTED inertia. Do you mean total m.o.i. of the action? Is > this an actual physics term? Vince, Mark D. first brought this up. You can find information on it through an internet search. Reflected inertia or equivalent inertia describes haw the MOI is changed by the ratios in a geared drive chain. Knowing the MOI of the shank doesn't tell us how much MOI is added to the key. To do that you need to know the ratio of how much of an arch the shank goes through in relation to the key. This ratio squared is multiplied times the MOI of the shank. Also is Action Transmission Ratio (that > you state in your attachment of "Finding the Total Moment...") the same > as Stanwood's term "Action Ratio"? What are the differences, if any? > Or at least, what do you mean? Yes basically the same. > At this point, I can see that according to the formula you presented, > that changing m.o.i. in the key cannot effect a change in the total > m.o.i. of the action by more than 4-5%. But also we must acknowledge > that this is mostly theoretical, at this point. Correct? > Yes John Hartman RPT John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] Rebuilding Steinway and Mason & Hamlin Grand Pianos Since 1979 Piano Technicians Journal Journal Illustrator/Contributing Editor [link redacted at request of site owner - Jul 25, 2015]
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