tuning pin torque

[Stéphane Collin]

Hi Stephen.

I think Ron N has a nice chart about this.

Stéphane Collin.


----- Original Message ----- 
From: "Stephen Birkett" <sbirkett@real.uwaterloo.ca>
To: "Pianotech" <pianotech@ptg.org>
Sent: Tuesday, January 25, 2005 7:55 AM
Subject: tuning pin torque


> In measuring and reporting tuning pin torques what is the normal 
> assumption about the contribution of the string to the measurement? This 
> will provide about 35in.lb helping of hindering tuning pin torque 
> depending on the turning direction during the measurement. Typical values 
> are often mentioned, eg. "loose pins are when torque is <50in.lb" "ideal 
> tuning pin torque is around 100-150 in.lb range", ">200in/lb torque is 
> tight pins" and so on, without saying if these are intended to be true 
> torque (i.e. no string), or clockwise vs counterclockwise with a strung 
> pin at tension. The latter will vary +/-35in/lb or so [for a typical full 
> tension string]. I suspect the reported pin torque values probably refer 
> to counterclockwise and strung pins, since it's more likely this is how 
> they would be measured [although not when re-pinning a pinblock of 
> course]. So a torque of say "50in.lb" woulld actually be a true torque of 
> around 85in.lb with just the pin. But I'm guessing this is the intent of 
> the reported numbers.
>
> On the same subject, I'd be interested to know what hole sizes are 
> typically used by our various dramatis personae here, say for reference 
> 2/0 pins. But tell us your pinblock material as well for obvious reasons 
> so comparison is meaningful.
>
> Stephen
> -- 
> Dr Stephen Birkett, Associate Professor
> Department of Systems Design Engineering
> University of Waterloo, Waterloo ON Canada N2L 3G1
> Director, Waterloo Piano Systems Group
> Associate Member, Piano Technician's Guild
>
> E3 Room 3158
> tel: 519-888-4567 Ext. 3792
> fax: 519-746-4791
> PianoTech Lab Room E3-3160 Ext. 7115
> mailto: sbirkett[at]real.uwaterloo.ca
> http://real.uwaterloo.ca/~sbirkett
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