[pianotech] Size of Pinblock Drill bit?

[Mike Spalding]

Thanks, Jim.  Totally clear now!

Mike Spalding

On 3/7/2013 7:31 AM, Jim Ialeggio wrote:
> ------------------------------------------------------------------------
> Mike Spaulding wrote:
>
> <Nubbed? By hand? more detail please!
>
> Ouch!!  I read back over my post and realized I misstated what I meant 
> to say.
>
> Here it is corrected with a pic of the SLOW SPIRAL, nubbed bit:
>
> 1st pass 1/4" fast spiral, or whatever you bit you want to use...not 
> too picky
> 2nd pass - SLOW SPIRAL nubbed run through with a hand drill. Sized as 
> per final target torque and block type, by test.
>
> The nubbed bit simply has the cutting edge  ground off (eyeballed on 
> the grinder) to about a 90 deg angle at the OD of the bit's leading 
> edge. See pic.
>
> Just to confirm, I wrote fast spiral nubbed in my original post...I 
> meant to say that the 2nd pass is SLOW SPIRAL nubbed!!!
>
> I'm actually thinking of having WL Fuller regrind these so that the 
> 1st 1" is a 1/4" non-cutting pilot step drill... but haven't had that 
> done that yet.
>
> Jim Ialeggio
> -- 
> Jim Ialeggio	
> jim at grandpianosolutions.com
> 978 425-9026
> Shirley Center, MA
>

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