[pianotech] Measuring Action Ratios

[William Monroe]

I've had this happen recently too, David - on an M&H A.  I was similarly
confused and have yet to come up with an answer.  I only did Stanwood and
the 6mm dip gauge.  What is the lever arm formula you use?

William R. Monroe




On Tue, Jan 15, 2013 at 7:56 PM, David Love <davidlovepianos at comcast.net>wrote:

> When analyzing actions I've used both the gauge for measuring key travel
> versus hammer travel as well as the actual measuring and multiplying out
> the
> three separate lever arms.  So far, they've been fairly close.  However,
> today I was measuring a MH A and the gauge gave me a AR of 5.2 whereas the
> measuring of the three arms gave me 5.9.  Curious.  Assuming I'd measured
> incorrectly I remeasured several times and got the same result.  When using
> the numbers to calculate via the Stanwood method the predicted balance
> weight/front weight/strike weight relationships the 5.9 was clearly the
> more
> accurate number.  At a bit of a loss to explain it so, for the moment, all
> I
> can do is report it.
>
> David Love
> www.davidlovepianos.com
>
>
>
>
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