[CAUT] CAUT] Shank Pitch

[Jim Busby]

Hi David,

Have you indeed done studies to "prove" that different pinning friction has a direct affect on tone? If so, have you published it? Chris Robinson and Rick Baldassin did some experiments about 20 years ago but didn't do anything they felt was worth publishing. Tone and flange friction has been at the heart of many discussions here, but something definitive on the topic would be great to have.

The student here (BYU who is doing some scientific studies could definitely use these flanges.

Thanks for all you do for the piano world!

Regards,
Jim Busby BYU

________________________________
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of David C. Stanwood
Sent: Monday, February 25, 2008 12:41 PM
To: caut at ptg.org
Subject: Re: [CAUT] CAUT] Shank Pitch

Hi Ric,

I'm using the adjustable hammer flange friction bolts as teaching tools these days...  If any of you are serious and want to experiment I'd be happy to provide some samples.

David Stanwood


Hi Jim.

Point taken, and I think I understood you from the beginning. I'm
assuming that the kind of differences in tone that a looser pin will
make are different then a shank with a soft spot causing an abnormally
low resonant frequency.  But, since I dont know more specifics about
what Chris was exactly getting at... I'll have to reserve further
judgement until I get a chance to try this out myself.

Sorting by frequency ahead of time is indeed easier then sorting by
weighing.  And all this has gotten my head a scratch'n again :)... so on
the set of D shanks I'm about to weigh I will cross check just for the
sake of interest.  I have a set of weighed shanks ready to install for a
Bechstein B also... I can check the resonant frequencies of them and
cross check them as well. Should go fast enough.

Most certainly tho... if Chris has demonstrated that pinning can effect
shank resonant frequency... then these are best sorted ahead of time.
I've heard of the adjustable friction flange... but never tried them...
so I cant speak as to how they work.  Perhaps Stanwood himself may chirp
in here.

Cheers
RicB
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20080225/5b6f2894/attachment.html