This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Re: rear string lengths ----- Original Message -----=20 From: David Love=20 To: Pianotech=20 Sent: December 05, 2002 4:59 PM Subject: Re: rear string lengths We don't have the luxury of that much backscale length on the standard = S&M, I mean S&S where zero bearing is the usual target. I assume that = is one of yours. =20 It's a M&H BB. I am curious about the bearing in the treble section as it relates to = backscale length. Minimizing the bearing in the bass is something I am = aware of for the reasons you mention. But what about in the treble. = Would you consider modifying the bearing there depending on backscale = length?=20 Depends on what you mean by "modify." And what you mean by "bearing." I = go by string deflection angles and adjust distance bearing to give me = the string deflection angle I'm after. No, I don't vary that much at = all. Unless I'm working on one of the S&S pianos with that ridiculously = short tuned duplex backscale they used for a while. Then I back off = some. And back to the question posted earlier and addressed to some degree = by Ron O., what is the ideal backscale length for each section? How = much must the backscale length deviate from the ideal length before you = would consider modifying the bearing (if you would)? Well, I can tell you what I like to see back there, but as to whether or = not it is ideal I can't really say. I'm not yet convinced there is an = ideal. Probably more like an ideal range. Or, perhaps, an ideal for each = type of scale -- long, short, high-tension, low-tension, etc. -- = modified by the characteristics of the soundboard.=20 Generally I like to see (starting from the top of a typical 4-section = scale) from 50 to 100 mm in the top section; from 75 to 150 mm in the = next section down; from 150 to 200 mm in the tenor section; and whatever = you can get in the bass. This depends a lot on what you want out of the = bass and on how long the piano is. I'd be happy with 100 mm in a 150 cm = grand but not in a 275 cm piano.=20 And something else I've always wondered about, why, on many pianos, do = hitch pins in the treble and tenor of many pianos not follow the curve = of the bridge, but seem to go in a zig zag sort of pattern?=20 A safety device to avoid setting up a stress line in the quite brittle = gray iron casting. Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/dd/ea/b6/5e/attachment.htm ---------------------- multipart/alternative attachment--
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