SV: Re: Reverse Torque tuning pins & reverse crown

[Frank Emerson]

I recall that at Baldwin, about 15 years ago, they used a go-no-go gauge
which was used to check each and every tuning pin that was used in their
grand production.  If I remember correctly, it was discovered that rolled
pins tended to be slightly out-of round (oval shaped in cross section), and
less so with cut threads.  This was their reasoning for using cut threads
rather than rolled threads.  Pins that were found to be outside their
tolerance for diameter were set aside in grand production to be used in
upright production.  In other words, a wider tolerance was allowed for
upright, and a narrower tolerance for grands.  I do not recall what the
exact tolerances were in either case.

Frank Emerson


> [Original Message]
> From: Ron Nossaman <rnossaman at cox.net>
> To: Pianotech List <pianotech at ptg.org>
> Date: 4/6/2007 2:31:08 PM
> Subject: Re: SV: Re: Reverse Torque tuning pins & reverse crown
>
>
>
> > Isn't this the "gimmick" that Yamaha used to use for the salesmen to 
> > demonstrate to their customers about the
> > tuning stability? Put it in a handkerchief and turn it backwards?
>
> I don't know about Yamaha, but it was certainly the gimmick 
> the competition used to suggest that these pins would chew up 
> the pinblock and the pins would be loose in short order. 
> Unfortunately, Yamaha had some problems with loose pins in the 
> early imports into this country, which lent credence to the 
> thing. Cut thread pins don't, in fact, chew up pinblocks.
>
> BTW, remember the rolled thread pins APSCO used to sell, that 
> snapped and popped in the block no matter what you did? It's 
> Denro blued for me, but does anyone even sell other than cut 
> thread pins anymore?
>
> Ron N
>