[pianotech] Oversized tuning pins

[David Love]

I think it has less to do with where the threading starts and more to do
with whether the length of the pin puts the new diameter in contact with the
"shelf" that forms where the compression of the old hole stops from the
original pin.  It's a good reason to ream or drill out the hole with
something that fits the new size pin in order to, if nothing else, punch out
that shelf so it doesn't come in contact with the new pin, or use a shorter
pin.  I don't think it matters that much if you go from German to Japanese
pins.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES at aol.com
Sent: Sunday, November 29, 2009 3:35 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Oversized tuning pins

 

David:

 

This is particularly true if one makes the mistake of mixing Oriental pins
with standard or German pins. The profile of the pin-end is quite different
with threading starting at quite different places, so that friction at the
bottom of the pin is dramatically increased. 

 

P

 

In a message dated 11/29/2009 4:42:56 P.M. Central Standard Time,
davidlovepianos at comcast.net writes:

It can also happen if the new oversized pin bottoms out where the original
pin stopped.  That area below the original pin is still the diameter
designed for the original pin so when the new oversized pin gets down there
it's too tight and worse, it's too tight at the bottom of the pin.  

David Love
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Al Guecia/AlliedPianoCraft
Sent: Sunday, November 29, 2009 8:31 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Oversized tuning pins

Scott,

Yes, that's one of the possible causes, but there are others.
Removing the old pins and creating to much heat (burning the hole). New 
tuning pins to large. And I'm sure there are hacks out there that can screw 
it up in other ways.

Al




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