[pianotech] Toy piano scaling

[Ron Nossaman]

David Doremus wrote:
> This is off the wall and off topic but I thought I'd throw it out to the 
> mathematical among us....
> 
> I have toy piano for a long time customer who wants it to work for her 
> granddaughter, several of the tines are broken. I have a friend who is a 
> metal worker so making new ones is possible, the question is how to 
> calculate the proper length without simple trial and error. Is there a 
> formula or two for calculating the pitch of a steel rod? Any advice?
> 
> --Dave

I'd start with one a tad longer than the average of the one 
above, and the one below, and grind to finished length. You 
can calculate all day long and will end up doing that anyway.
Ron N