The maker of the Biene tuning pins I carry maintains that the proper or best way to make tuning pins is to cut the thread after the plating or blueing has been done. This produces the sharply defined threads that manufacturers and rebuilders prefer. See the photo comparison between a Biene pin and a common brand. It looks like the threads on the lower pin were scraped, not cut. Regarding left hand threads on tuning pins: Biene also produces these. They are normally used for cymballoms (sp?) and other hammered dulcimer family instruments. I am in the process of placing another order with Biene, so if anyone wants to try some reverse thread tuning pins, now is the time to let me know. Jurgen Goering Piano Forte Supply (250) 754-2440 info at pianofortesupply.com http://www.pianofortesupply.com -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 834 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20070406/e9d62760/attachment-0002.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: P1060020.B.a.jpg Type: image/jpeg Size: 20431 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20070406/e9d62760/attachment-0001.jpg -------------- next part -------------- On Apr 6, 2007, at 11:00, pianotech-request at ptg.org wrote: > Hi Dale - > I posted this question to both lists and had a reply from Don Mannino > on CAUT that explained it quite succinctly, so, without prior > clearance, heeeeeeeer's DON! > >> Reverse Torque Tuning Pins is a marketing term (read, misnomer) for >> the >> concept of 'cutting' the threads into the tuning pins after plating, >> as >> opposed to rolling the threads into the pins or plating over the >> threads >> after cutting.? This cutting process causes the threaded portion of >> the >> pins to be slightly rough in one direction, but smooth in the other. >> The rough surface increases the pin torque in the pitch lowering >> direction (counter-clockwise), but it is smooth in the pitch raising >> direction (clockwise).? The result is that the effort in turning the >> pins is closer to being the same up or down in pitch, because the >> variation in torque is the opposite of the string tension. >> >> The relative benefit for tuning feel is, of course, a trade-off with >> longevity, as the rough pin does tend to chew at the wood a bit.? >> Since >> our actual rotation during tuning is small it's not much of an issue, >> but when changing strings it certainly can be. > > From: Aras <aras6310 at yahoo.se> > Date: April 6, 2007 7:58:04 PDT > To: Pianotech List <pianotech at ptg.org> > Subject: SV: Re: SV: Re: Reverse Torque tuning pins & reverse crown > Reply-To: Pianotech List <pianotech at ptg.org> > > > David, > Yes, I understand. I just thought you meant the way the thread runs as > I wrote. > Some years ago I bought pins from US where the thread was cut after > making them blue or nickel plated and they felt sharper than other > pins. Logically it should be the best way to make tuning pins. > Aras. -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 2220 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20070406/e9d62760/attachment-0003.bin
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