Hello Jon, Three things come immediately to mind: 1.+AKAAoACg- The drill used to bore through the key and into the balance rail can be deflected by the grain or other wood content. 2.+AKAAoACg- Measurement set up variation from key to key.+AKA- I would be unconcerned with even +-/- .1 variation.+AKA- Average is. 3.+AKAAoACg- Key design can cause differences between naturals and sharps. Sweating that level of detail is of little practical value.+AKA- Actions are inherently variable because of wood, assembly, design, densely, wear, weather and measurements. +AKA-The fact that such variations are observable says much about the system design. +AKAAoACgAKAAoACgAKAAoACgAKAAoACgAKAAoACgAKAAoACgAKAAoACgAKAAoACgAKA- Newton Jon Page wrote: > Here's something to break the monotony: > > Why are some piano's key ratios so erratic > and other a closer tolerance? > > Is the hole that much off note to note to create > a .02 to .05 difference?
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