[pianotech] Size of Pinblock Drill bit?

[Jim Ialeggio]

Ed Foot wrote:

<I have made my own pinblock reamers from bits in which I grind away all 
the cutting edges for the first inch or so of the bit. It makes for an 
accurate pilot without chewing a
sideways hole on the way in.

This is interesting and makes a lot of sense.

So, what exactly is the cutting action of a reamer?  Is is simply a 
scraping action?  If so, what keeps the 1st hole's wall fibres from just 
bending over rather than actually being sheared off ?

Jim Ialeggio

-- 
Jim Ialeggio	
jim at grandpianosolutions.com
978 425-9026
Shirley Center, MA