Renner Action Geometry Calc

[Farrell]

Hi List. I attended the All-Day Renner Action class in KC. They presented
some action geometry diagnostic calculations that utilized "Key In, Key Out,
Wippen In, Wippen Out, Hammer In, Hammer Out" measurements. I have my
spreadsheet with all the formulas, but I cann't find my class notes that
have the definitions of exactly where to physically measure for the six
parameters. Does anyone have that info?

Also, I downloaded Nick Gravagne's action geometry program from the web
yesterday. It quite clearly appears to be the exact same formulas that the
Renner approach uses. Am I right? I thick that the knuckle-to-hammer center
measurement may be different though. Nick's program is very user friendly.

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com