[pianotech] Drilling Pinblocks from the bottom

[Ron Nossaman]

David Love wrote:
> Since the pinblock needs to be tightest at the top, wouldn’t it make 
> sense to drill them from the bottom of the block?  Double drilling would 
> make that possible and then the slight bit of wandering and run out as 
> you line up the hole for the second pass would only impact the bottom of 
> the hole and not the top.  Drill the first pass from the top and then 
> flip the block over and run the second pass from the bottom.  Assumes, 
> of course, that you don’t drill the block in the piano after it’s 
> installed. 

It makes more sense to me to use a composite block, with a 
layer of high density material on top of a low density block. 
Drilling for the high density block guarantees that the block 
is tighter at the top than at the bottom. And you can do it in 
the piano.
Ron N