[pianotech] Size of Pinblock Drill bit?

[Dean May]

the friction resistance torque of the pinblock is the friction force times
the radius of the pin. So for a given interference friction, the larger
diameter pin will have more resistance torqe. 

 

Dean

Dean W May                (812) 235-5272 voice and text 

PianoRebuilders.com    (888) DEAN-MAY        

Terre Haute IN 47802

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Noah Frere
Sent: Wednesday, March 06, 2013 4:13 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Size of Pinblock Drill bit?

 

Good point both of you on the brad point. Why 1/0?  From what i understand,
it has a nicer feel because of the decreased surface area contact with the
wood. Plus it leaves more room for coils and string clearance. Plus they're
less expensive i think (though that is an after-thought). Plus i like fine
things. Thinner is finer :)  Any reason why not?

 

On Wed, Mar 6, 2013 at 3:56 PM, Ron Nossaman <rnossaman at cox.net> wrote:

On 3/6/2013 1:57 PM, Noah Frere wrote:

I searched my not inconsiderable archives for an answer, but have come
up empty-handed. I am using 1/0 Denro blued tuning pins in a new
multi-lam Maple pinblock, and need to order the drill bit. I'd like to
double-drill - makes sense. The Pianotek catalog recommends, in effect,
a drill bit .016" to .021" under the diameter of a 2/0 pin in a
multi-lam pinblock. Following that logic, I could use the .250" on the
first pass, and the .261" (.015" under) or .257" (.019" under) drill bit
on the second pass. Also, I like the idea of the brad-points, but also
like the idea of the other ones, which are "slow spiral."  Any
recommendations?

 

You can't use brad points on the second pass anyway, so decide if they will
get you anything desirable on the first and buy accordingly. Slow spiral,
definitely, particularly on the second pass. The 0.250" should be fine for
the first pass. As to final size, as Greg said, test - etc.

Why 1/0?

Ron N

 

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