Tuning pin drilling?

[jimialeggio5 at comcast.net]

Terry,

You're right...I've already accepted the torque discrepancy as not too bad. 
What bugs me is why the smaller pins are tighter...its all backwards.

My criteria for choosing full thickness Delignit is that as a high end woodworker, 
I have been responsible for chopping up way more old growth lumber than I would have liked.
Not only that, but quarter sawn lumber is a really inefficient use of the logs board footage.
If there is no other choice I will relunctantly use the old growth, but when, as in the case of 
Delignit, an engineered substance exists, I really would prefer to use it instead.     

Yes, its unforgiving.  That's why I've tried to design a drilling process that resembles more
what a machinist would do, rather than what a woodworker would do. 
Its also why I chose not to drill in the piano, which from all other angles is more efficient than
drilling on the bench. 

Jim I
-------------
You get all your tuning pin torques within 20-25 in.-lbs. - and you are 
complaining? I'm really just kidding - but gosh, that's not all that bad! I 
understand your question and I agree that it seems weird. I really don't 
know why that would be. I'm curious though - I usually use either a 
quarter-sawn 5-ply hard maple pinblock or the rotary-sawn Multilam 
hard-maple block from Pianotek (although usually with a Delignit cap) - 
don't you find the Delignit somewhat unforgiving? Just curious about your 
criteria for block selection.

Thanks.

Terry Farrell

----- Original Message ----- 
> This has me baffled.
>
> I'm drilling Delignit blocks for tuning pins.  2/0 pins.  2 step hole, aka 
> Ron's
> 2 step drilling procedure, with
> modifications to suit my equipment and personality.
>
> Block on the bench on an adjustable beveled bed.
>
> 1st pass, drill hole @ 1/4" using a fixture I made which holds a 1/4" 
> drill
> bushing right up close and personal
> to the block to stabilize the initial hole and make up for the inaccuracy 
> of my
> press.
> 2nd pass with a slightly shy "I" bit (.271) which has a non-cutting 1/4" 
> pilot
> ground on the 1st 1/2"
> of the tip to center the 2nd pass. I dust the pins with rosin before 
> driving.
>
> Holes are nice and consistent as proved by consistent torques (130in/lb) 
> on .282
> mic'd pins.
>
> Here's the weird part. I mic the pins and am mostly only using the pins 
> that are
> either .282, or slightly light
> at about .281 or .2805.  When I drive both the .282 and the light pins the 
> light
> pins consistently torque at
> about 20-25 lbs more than the .282 pins.
>
> This makes absolutely no sense to me.
>
> Any ideas why this is happening?
>
> Jim I
>