Pinblock Drilling Centering

[Farrell]

You mean about the tape? I got that one. That appears to be a handy way to position the center punch in a consistent manner wherever off center you decide you want it. And I appreciate the tip. My question is where do I want it!? How much does the pin move/bend/migrate? How far off center do I need to compensate for any pin movement so that once strings are up to tension, I end up with a tuning pin in the center of the hole.

I see so many pianos where the tuning pin rides the back end of the plate hole. Maybe they drilled the tuning pin hole in the block there. Or did the pin move after stringing? Ron may be right - just let it ride. He answered my question with the Delignit block - expect no movement. Can anyone tell me how much if any movement of position will occurr for a tuning pin set in a Bolduc block between drilling and after string tension is applied. I suspect there typically is some measureable movement.

Terry Farrell
  
----- Original Message ----- 
From: <Kdivad@aol.com>
To: <pianotech@ptg.org>
Sent: Wednesday, October 23, 2002 11:13 AM
Subject: Re: Pinblock Drilling Centering


> In a message dated 10/23/02 7:27:12 AM Central Daylight Time, 
> mfarrel2@tampabay.rr.com writes:
> 
> 
> > 
> > Lots of good suggestions on centering a hole, but Ron is the only one that 
> > touched on my real concern. I like the Bolduc blocks, but I have a general 
> > concern about using them on a no-bushing plate. I was planning on using 
> > (for the first time) a Delignit block on this M&H upright. 
> > 
> > 
> 
> Terry you must have missed my earlier post about punching an off center hole.
> 
> David Koelzer
> Vintage Pianos
> DFW
>