Tuning pin drilling? followup

[John Delacour]

At 18:54 -0400 1/10/07, Erwinspiano at aol.com wrote:

>    Yeah, it's a  synch.  I use brad points that just fits in the 
>holes. I dimple each pin location & then drill with a brad point on 
>the drill press. Hles vary & so do the brad point sizes. The brad 
>point just homes in on that little target & bulls eye.


At 00:32 -0400 2/10/07, Erwinspiano at aol.com wrote:

>     The bit I use is cheap as you can get.  It only has to be 
>round and have a pointed tip so it puts just the slightest dimple in 
>the Block.

At 22:37 +0100 25/5/07, I wrote:

>I first make the marks with a sharp punch, then use a centre drill 
>and finally drill (right through or not, depending on the piano) 
>with a special (German) wrestplank drill which has a more acute 
>point than the jobber's drill and a faster spiral.  If drilling a 
>pilot hole right through would make the result more precise, I'd do 
>it, but I don't see that it would.  However I would never consider 
>using the wrestplank drill without first using the centre drill.


        

I would never use a brad-pointed drill and I would never use any 
drill, no matter how dear or cheap, that did not have the fast helix 
angle.

JD

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