This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Paul: Because of the difference in diameter between the coil portion and the = block portion, is there any danger of shearing the pin off if the pin is = too tight in the block? David Love ----- Original Message -----=20 From: larudee@pacbell.net=20 To: pianotech@ptg.org=20 Sent: January 26, 2002 11:54 AM Subject: Re: Tuning Pin Size David,=20 You are right on target. Comments below.=20 Paul=20 David Skolnik wrote:=20 Paul -=20 I think you are right. There has and will be plenty to discuss. I, = at least, have already gotten the Feb issue, and also promise to read = it, but some of my concerns date back to a number of months ago when, in = response to a particular thread, you first started talking about your = pin. One of these concerns is that, as a way of avoiding block = replacement, they are not viable if, as in many of the pianos I see, the = original pins are already against the plate, whatever their size. Yep, there's no way my pins will back the holes off away from the = plate. The only good solution there is a new block.=20 Second, while I understand (I think) the theory regarding torque and = flex, I suspect that other factors, such as lack of quality control of = pins, or of the fit between pin and block (whether new or repinned), not = to mention too much or too little friction between pin and sounding = length of string, have much effect upon tunability than the diameter = around which the string coils. These are all extremely important, and there is no way that my pins = are designed to compensate for inadequacies in any of these areas. In = fact, one of the cautions I include with the pins is not to overtighten = them, which is a problem I find with some restrung pianos. My pins do = not need to be as tight, because of the reduced torque. Furthermore, = the difference between what I call uptorque and downtorque (pulling with = or against tension) is less with my pins than with other oversize pins. = Another point is that the design of my pins frees the diameter at the = coils to be essentially independent of the diameter in the rest of the = pin. Of course there are limitations of strength, but otherwise very = narrow diameters like 6.75mm. are entirely feasible on a base that is as = big as you want. That's the principle that I think would be of use to = Steinway. Finally, Klinke, the manufacturer of my pins and regular = Diamond pins makes just about the most precise ones in the business. I = needed that kind of precision for my pins in order to get them perfectly = coaxial and cylindrical. Mic them all you want; they come out virtually = identical.=20 Remember two things about pin flex...1) It can be a very useful = tool in fine tuning, and 2) it is affected by tightness in the block. = A tight pin with no flex can be as difficult to fine tune as a pin with = too much flex, whatever its diameter. Yes, flex can be useful, and some manufacturers rely on it more than = others in their design. I like to minimize it as much as possible = because it compromises the pin's function as a stable anchor, and I = prefer to achieve tunability by other means, to the extent possible.=20 =20 Now to read your article and find out what you really said..=20 =20 David Skolnik=20 At 11:37 PM 01/25/2002 -0800, you wrote:=20 Chances are that at this point we get into "but what about...," in = which case I get to rewrite the whole article on line. I would just as = soon wait for the February Journal. There will probably still be plenty = to debate, but at least not the stuff I've already covered in the = article.=20 Best regards,=20 Paul ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/b0/86/cb/f3/attachment.htm ---------------------- multipart/alternative attachment--
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