Nice simple idea.
I will say, though, as my experiments and understanding of the geometry's effecting compliant front segment behavior comes more precisely into focus, I am choosing, when the geometry calls for it, to set pin height, deliberately, slightly inconsistent. Actually, occasionally, sometimes more than slightly for individual pins. Some of the conditions that would warrant unequal heights would be:
1- string and coil interference, defined by factory placement of pin holes in the plate webbing
2- depending on the angle of speaking length termination, where there is a short segment between agraffe and the pin, where the front segment first rises to the counterbearing, then aggressively lowers to the pin, over a very short distance. Given a high agraffe termination angle, this path of the front segment forces the front segment to then additionally follow a wide contact radiused area on the counterbearing surface. This increases downbearing and friction on the counterbearing significantly. This is most common in the bass and low tenor (grands). Additionally each of the pins of each unison in these places will have different length relationships to the counterbearing, and thus different pin height conditions.
One of my complaints about the rebuilding community as a whole presenting over simplified goals which folks look for to assess a "quality" installation, is that in making the work conform to this simplified metric..."all pins the same height = good job"...in some cases, on most pianos, can degrade the most essential aspect of the front segment...that being, setting up the front segment to allow tuners to have compliant rending. Compliant rendering means the piano can be tuned with great precision and maximized stability.
Its a great simple idea, and I like it...but I would like to see the goals of setting pin height clearly defined not only visually, but functionally as well.
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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
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Original Message:
Sent: 08-27-2018 08:41
From: Peter Grey
Subject: My Sliding Tuning Pin Height Gauge
Chris,
I like it. Gonna make one myself! Great thinking and application.
Pwg
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Peter Grey
Stratham NH
603-686-2395
pianodoctor57@gmail.com
Original Message:
Sent: 08-27-2018 06:42
From: Thomas Servinsky
Subject: My Sliding Tuning Pin Height Gauge
I bow to you sir.....brilliant!
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Tom Servinsky
Original Message:
Sent: 08-26-2018 17:35
From: Chris Chernobieff
Subject: My Sliding Tuning Pin Height Gauge
I came up with this Jig for leveling the height of Tuning Pins. Easy to make and simple to use. I think you'll love it.
https://youtu.be/0gP3AJYSyu4
-chris
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I'd rather be short and fat than tall and skinny.
chernobieffpiano.com
865-986-7720
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