Bolduc Block - Bit Size - Torque

[Farrell]

No, didn't really have anything left over but a few small irregular shaped scraps (but yes, I should have drilled a few holes anyway before installing the plate). Even still, its the fact that I am going to such a large drill size that is giving me the creeps. Thanks.

Terry Farrell
  
----- Original Message ----- 
From: "Greg Newell" <gnewell@ameritech.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, June 17, 2003 12:03 PM
Subject: Re: Bolduc Block - Bit Size - Torque


Terry,
         It's been my experience that a block will relax a bit after the 
initial results from stringing. You may start out with 200 or so and end up 
with 170-175. Didn't you save a piece of the pin block you used and run 
some tests with different sized bits and pins?

Greg



At 08:15 AM 6/17/2003, you wrote:

>I am stringing a piano that I installed a new Bolduc quarter-sawn 
>(more-or-less) hard-maple pinblock. I am using Ron Nossaman's two-bit 
>drilling method. I started out with a final drill size of 0.25-inch 
>(actually the drill bit that Pianotek sells specifically for the Bolduc 
>blocks - it is actually about 0.247-inch). I was consistently getting an 
>initial torque exceeding 200 in.-lbs. I tried a couple larger bits that 
>produced similar results. I have drilled my latest holes with a final bit 
>size of 0.263. I am getting an initial torque (right after pounding the 
>pin to stringing height) of about 180 in.-lbs.
>
>At 180 in.-lbs. I feel like I am at the upper limit of what I should be 
>shooting for (beyond?). How much can I expect the torque to fall in the 
>first month/year or so when things settle in? My guess is that I could go 
>with an initial lower torque, but I am concerned that perhaps things are 
>going to loosen up and I might be too loose if I use a larger bit (I'm 
>already so much bigger that what is commonly recommended).
>
>The block has been in my 8.5% MC-stable shop for more than six months.
>
>This is only my third block that I am drilling. If I am going to error, I 
>would rather error toward the upper limit. Both my others were about 200 
>in.-lbs. - YIKES! This is my piano - I don't want to have to tune with 
>such a block - yet, loose pins do no one any good.
>
>Thanks for any constructive input.
>
>Terry Farrell
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives

Greg Newell
Greg's piano Forté
mailto:gnewell@ameritech.net 



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