---------------------- multipart/alternative attachment Hello Robert. Could you please explain the Screwdriver test for loose pins? Thanks and Happy New Year! Aart Markenstein Aart in America Piano Services Hoboken, N.J. 07030 201 406 2594 aartinamerica@optonline.net On Dec 29, 2005, at 10:24 AM, KeyKat88@aol.com wrote: > In a message dated 12/18/2005 4:15:04 PM Eastern Standard Time,=20 > robert.scott@tunelab-world.com writes: >> Ric, it's not magic.=A0 When struck, the string starts out vibrating=20= >> only in the up and down direction.=A0 But it quickly precesses into = an=20 >> elliptical path, as described by Peter Weinbreck's articles in the=20 >> 1970=92s, and perhaps even earlier.=A0 Since the string is vibrating = both=20 >> up-and-down and right-and-left, the termination point must be viewed=20= >> separately in both axes.=A0 If the termination point is the same for=20= >> all directions of vibration, then all is well, and every vibration is=20= >> at the same pitch.=A0 But if the termination point for up-and-down=20 >> motion is different than the termination point for right-and-left=20 >> motion, then these two motions will occur at different pitches, hence=20= >> the false beat between them.=A0 When a bridge pin is loose, it does = not=20 >> resist right-and-left motion as well as the bridge cap resists=20 >> up-and-down motion.=A0 Therefore the right-and-left vibration = effective=20 >> speaking length is slightly longer than the up-and-down effective=20 >> speaking length.=A0 This is consistent w! >> ith the=A0 >> observations of performing the screwdriver test for loose pins. >> >> Robert Scott >> Ypsilanti, Michigan >> _______________________________________________Greetings, > =A0 > =A0=A0=A0=A0=A0=A0=A0 This explaination is excellent!=A0 Thank you! > =A0 > Happy Holidays > Julie Gottshall, > Reading, PA =20= ---------------------- multipart/alternative attachment A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 2751 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/87/e4/3e/59/attachment.bin ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC