Action flange crushing

[David Ilvedson]

Jeez Louise....you tighten the screw until it's snug....;-]

David I.



----- Original message ---------------------------------------->
From: Phillip Ford <fordpiano@earthlink.net>
To: Pianotech <pianotech@ptg.org>
Received: Wed, 17 Nov 2004 18:35:06 -0700
Subject: Re: Action flange crushing

>>Hi Phil,
>>
>>>  Interesting that you have the number of 18 lbs (is that 18 in.-lbs,
>>>  by the way?).  One factory rep told me, off the record, that he
>>>  believed that 12 in-lbs would crush a maple flange.  Also, Guy
>>>  Nichols seemed to recall that the Baldwin factory used 10 lbs (10
>>>  in.-lbs?) for action screws.
>>
>>I don't own a torque wrench, but I have a cordless Ryobi drill/screwdriver
>>that has torque settings from "5" to "25," as I recall.  Is this an inch-lb
>>scale?  (Not that I would use the thing on a flange screw --- but at least I
>>would know what 18 or 12 or 10 in-lb feels like on a screw placed into a 2x4
>>or something.)
>>
>>Peace,
>>Sarah

>I don't know.  Other people have told me that they use a setting of 
>so-and-so on their Milwaukee screwdriver, Acme screwdriver, etc.  I 
>know the setting that I use on my electric screwdriver.  I suppose if 
>you assembled all these devices, assuming that the factories that 
>make them have strict enough quality control so that they are 
>uniform, and checked them against a torque reading screwdriver you 
>could start to get a picture of the torque that experienced techs 
>use.  I had hoped some piano manufacturer had already done this 
>research project.  Another thing to go on the list of things to do I 
>guess.

>Phil Ford
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives