Pivot termination is at the capo. The capo comes to a true "V", so the string pivots over the capo into the front duplex, instead of the capo being a wide bearing surface which allows less pivot. Yes I am grinding off the original cast duplexes, but re-designing them, not removing them. I'm using Ed Mcmorrow's Fully Tempered Duplex Scale duplex, and co-polymer counterbearing duplex terminations. I am most decidedly
not abandoning duplexes. I did in the past, based on suggestions from Ron N, but I was very unhappy with the sustain in high trebles that assumed the impedance model was the only factor effecting sustain up there. My take is, that the conditions at the terminations, tighter bridge pin front to back spacing (10mm) to reduce losses at the bridge pins), generous backscale (pushing 1:1 if you can get it at 88) and hammers as light as you can them, create sustain...at least in this high treble section. Sustain in my high trebles is now consistent piano to piano, with high levels of discernable pitch.
Also, I've backed off the bearing in the high treble as well, and that is why I use vertical hitches up there. All I want is positive bearing to make sure the bridge pins are not being compromised by negative bearing...maybe 1 deg or a little less composite bearing. The vertical hitches help here, because targeting that composite angle is really difficult. When SL's are that short, bridge height above string plane at 88 is a scant 0.75mm...which is pretty hard to hit without some form of adjustability.
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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
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Original Message:
Sent: 05-03-2021 16:01
From: John Pope
Subject: Chris Maene Soundboard
Jim,
What is "pivot termination"? Also, are you redesigning duplexes? I gathered from an earlier post about vertical hitch pins (which was very helpful) that you were dispensing with duplex scales altogether.
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John Pope
University of Kentucky School of Music
Lexington, KY
Original Message:
Sent: 05-01-2021 12:27
From: Jim Ialeggio
Subject: Chris Maene Soundboard
The 1:58 pic seems to show a constant grain angle of 45-ish, to the bellyrail, or in that department. This means the long bridge has the grain running at a decent angle to it, rather than roughly along the bridge. I don't see, from the little I can see in that pic, anything like a changing angles of the grain in the treble.
This is quite different than what Del and Ron design(ed) to, where they were trying to get extra stiffness by having the grain running more perpendicular to the high treble bridge. I no longer approach grain angle in that way, perpendicular to the high treble bridge,, and am more along the lines of what Chris Maene is doing here. Reason being, in my experience, high treble sustain comes from termination conditions, pin conditions, and pivot termination, plus well designed duplexes and generous backscales. Hyper stiffness is not where I am anymore. When one can get real good high treble sustain, which exceeds a new hyper stiff board by a long shot, from an old board, it makes one rethink the impedance model we were mentored on.
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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
Original Message:
Sent: 05-01-2021 11:21
From: Christopher Storch
Subject: Chris Maene Soundboard
You migh be able to discern the grain of the soundboard from this video. 1:50 minute mark and 1:59 minute mark.
https://www.youtube.com/watch?v=CO7xWoIRrE0
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Christopher Storch
Belmont MA
617-489-6436
Original Message:
Sent: 05-01-2021 06:09
From: Terrence Farrell
Subject: Chris Maene Soundboard
Was reading about the Chris Maene straight-strung concert grand this morning and noticed that it is stated that "the grain of the soundboard of the treble part doesn't follow the strings but has been redirected parallel to the bridges." This would suggest that the grain direction for the tenor and bass areas of the soundboard are not parallel (or nearly so) to the bridges. Anyone know what grain angle he is using? Also, anyone know how the joint/transition between the two (or more???) grain angle areas of the soundboard is constructed?
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Terry Farrell
Farrell Piano Service, Inc.
Brandon, Florida
terry@farrellpiano.com
813-684-3505
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