[pianotech] Size of Pinblock Drill bit?

[Terry Farrell]

I'm curious, why the second pass by hand? Seems to me that a bit in a stable drill press will always give more consistent results. What do you folks see as the advantage to doing a second pass by hand?

Terry Farrell

On Mar 7, 2013, at 3:40 PM, Al Guecia/Allied PianoCraft wrote:

> I do and I think that most of us here who want to do the best job do.
> 
> Al -
> High Point, NC
> 
> 
> On Mar 7, 2013, at 8:59 AM, Noah Frere <noahfrere at gmail.com> wrote:
> 
> 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.com
> 978 425-9026
> Shirley Center, MA
> 
> 
> 

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