Attached is a photo showing one of them. A maple strip is fitted under the felt which raises the string to an appropriate level relative to the string coming off of the pin. Another option -- and this is what I most commonly do these days -- is to use a brass half-round or half-oval along the top of the ski slope. Again, this is to bring the string up to an appropriate level relative to the tuning pin. Del | -----Original Message----- | From: pianotech-bounces at ptg.org | [mailto:pianotech-bounces at ptg.org] On Behalf Of | jimialeggio5 at comcast.net | Sent: June 26, 2007 4:33 AM | To: pianotech at ptg.org | Subject: Tuning pin angle(s) | | List, | | In searching the archives and reading whatever info is | available in past journals etc, reasonable consensus is that | the string takeoff angle from the pin centerline to the | counterbearing bar should be around 90 deg. | | A couple of questions regarding this: | | 1-in looking at a number of plates, particularly ones with | the "ski slope/very minor counterbearing bar/lots of felt | contact ", the pin angle in relation to the webbing would | have to be a negative angle to achieve 90 deg string takeoff | angle from the pin. That is negative, ie actually angled | towards the belly, often by 4-5 deg, assuming coil height at | 1/8 " from plate. | | Is 90degrees takeoff ,90 degrees, irrespective of the | orientation to the webbing (or actually the rim top which | indexes many rebuilders drilling jig)? | | 2-the difference in takeoff angle between the front pin of a | unison and the back pin of the same unison results in a very | different takeoff angle, maybe 2-4 degrees. | | 90 degrees can't actually be 90 degrees throughout, unless | you're nuts. | | 3-the 90 degrees (or so) is not in relation to the stretcher, | but in relation to location of the agraffe, which again | changes from note to note. Does anybody actually customize | the direction of the angle from note to note? | | 4-Regarding the "ski slope/very minor counterbearing bar/lots | of felt condition"...rendering the string over all this felt | creates problems because of the tendency of the wool to hold | moisture, and rust the string/felt contact. | | ??Why is wool felt exclusively used in this place? Besides | the obvious reason which is "because that's the way its | always been done". Some rebuilders do in fact use acrylic | felt here, but keep it quiet in the fear that they might be | struck by lightening if anybody knew their dirty secret. Any | thoughts? | | Jim I | -------------- next part -------------- A non-text attachment was scrubbed... Name: Steinway A -- Maple string rest - trbl.JPG Type: image/jpeg Size: 47665 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20070626/1d6282f2/attachment-0002.jpe -------------- next part -------------- A non-text attachment was scrubbed... Name: Steinway A -- Maple string rest - tnr.JPG Type: image/jpeg Size: 62039 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20070626/1d6282f2/attachment-0003.jpe
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