[CAUT] steinway pedal plate screws

[David Skolnik]

Tom & friends,
I have devoted an unconscionable number of hours to this pursuit, to 
no avail.  The screw dimensions are .2125" (5.4mm)
iameter and 28+ tpi.  There must be someone who knows the history of 
this screw, why these dimensions were employed and when it might have 
changed.  At this point it seems a matter useless curiosity, nothing 
more.  Thanks

David Skolnik
Hastings on Hudson, NY



At 12:03 PM 7/22/2008, you wrote:
>Hi, David I. and David S., and Colleagues -
>
>I took a look at the pedal plate on an 1889 Steinway, the oldest on 
>the premises at the moment.  (I figured if there were an oddball 
>thread to be found it would be more likely the older the piano.)  I 
>found that screws anchoring the pivot rod were garden-variety No. 8 
>32-thread x 1/2 inch flat head machine screws.  We have a box of 
>these screws we keep on hand for the occasional replacement.
>
>To David S.:  30-thread would be very odd indeed.  There is no 
>current or recent (20th century) American, Canadian or British 
>standard thread at 30 pitch.  And that's why many thread guages skip 
>that pitch.  Metric threads don't quite approximate that either.  I 
>accidentally deleted your post on the topic, but I recall you 
>mentioned measuring your screw diameter at something like 0.213 
>inch.  That would be about right for a No. 12 screw, which should be 
>28 pitch in the fine-thread series.
>
>There would be no point in S&S using special threads for this 
>part.  Common hardware is available to do the job and it would be 
>much more expensive to have custom-made screws and custom-made taps, etc.
>
>~ Tom McNeil ~
>Vermont Piano Restorations
>VermontPiano.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20080724/b58b5292/attachment.html