Hi Joe Maybe your using the word bearing accidentally to mean crown? If the plate was really floating that much then maybe an increase in tone would occur in the regions which the subsequent plate movement would increase bearing in a 1 to one relationship. ie mostly at the bass low tenor or up in high trebles where the bolts are closer to the hitch rail. Even if the nose bolts/hitch rail were adjusted a subsequent amount to match the plate ,...Even then sometimes no change is noticed, except the tuning has now been whacked out. The beauty of the WN& G perimeter bolts is that it is possible to play with/adjust palte height after the piano is strung. More likely what you are hearing is from the benefits of mechanical coupling where energy is now not being lost into gnome land. Either that or....I dunno. You heard something...good enough! Dale S. Erwin www.Erwinspiano.com 209-577-8397 209-985-0990 Ronsen hammers/prep Sitka Sound boards Belly packages Poor decisions are rarely made right by a greatercommitment to them. "David Love" -----Original Message----- From: Delwin D Fandrich <del at fandrichpiano.com> To: pianotech at ptg.org Sent: Sun, Jul 3, 2011 8:37 am Subject: Re: [pianotech] SnS rim screws Then I’d sure like to see better explanations of just what mechanism might have been at work to cause an immediate and measurable increase in soundboard crown as a result of tightening plate screws/bolts. There is nothing one could do to the rim—or any other part of the skeleton—of an assembled piano that could conceivably cause a resultant increase in soundboard crown. Tightening plate screws and/or bolts simply will not do it—no matter how loose they might have been or how tight they have now become. ddf Delwin D Fandrich Piano Design & Fabrication 6939 Foothill Court SW, Olympia, Washington 98512 USA Phone 360.515.0119 — Cell 360.388.6525 del at fandrichpiano.com — ddfandrich at gmail.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Al Guecia/Allied PianoCraft Sent: Sunday, July 03, 2011 7:27 AM To: pianotech at ptg.org Subject: Re: [pianotech] SnS rim screws Joe Gross wrote: Cut to the chase: We tightened the bolts with a socket. Crown is back in the mid section where it was flat. Sustain 8 seconds. Del, I don't think it was relative humidity change in this case. As I read it, it was an immediate change. Al - High Point, NC On Jul 3, 2011, at 9:51 AM, Delwin D Fandrich wrote: It’s more likely the relative humidity around the piano has changed thus changing the moisture content in the board thus changing the amount of crown. Happens all the time when humidity levels changes. ddf Delwin D Fandrich Piano Design & Fabrication 6939 Foothill Court SW, Olympia, Washington 98512 USA Phone 360.515.0119 — Cell 360.388.6525 del at fandrichpiano.com — ddfandrich at gmail.com From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Al Guecia/Allied PianoCraft Sent: Sunday, July 03, 2011 5:33 AM To: pianotech at ptg.org Subject: Re: [pianotech] SnS rim screws Joe, it could then be possible that the plate was up off the supports and when you tighten the plate bolts you got the plate down onto the supports and thus the improved tone and down bearing. Al - High Point, NC -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20110703/d0453813/attachment.htm>
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