[pianotech] Toy piano scaling

[David Doremus]

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

  New Orleans