[CAUT] Digest, Vol 1103, Issue 85 Moving Wippen Rail

[Keith Roberts]

On 11/1/07, Richard Brekne <ricb at pianostemmer.no> wrote:
>
>   Either way moving
> the whole whippen 2 mm moves both points 2 mm.



This is where I think you are missing it. The jack center to wippen center
cannot change in distance. The RA remains the same length. 1 to
1.477changes to 1 to
1.430  with a 2mm rail move on the S&S wippen I just measured. It can lift
more weight. Not much but some.

If you lean the post or the jack from the tangent line of the RA, you have
to use vector analysis and angular momentum formulas to figure the output
transfered to the jack. It is not a distance measurment factored back
directly against the EA. As the jack leans it is an exponential function
based on the number of degrees the jack rotates. In other words from 0* to
30* there is not much change in force then from 30 to 60* it decreases
rapidily and from 60* to 90* force is about 0.

As it is I have a lot more to think about and detail, thank you and I will
get back as soon as I can.

Keith
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20071101/41a53e09/attachment.html