[pianotech] Size of Pinblock Drill bit?

[Noah Frere]

Thanks for the clarification. Does anybody else here do the second pass by
hand?


On Thu, Mar 7, 2013 at 8:31 AM, Jim Ialeggio <jim at grandpianosolutions.com>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.com978 425-9026
> Shirley Center, MA
>
>
>
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