Go | New | Find | Notify | Tools | Reply | |
| Piano picture of the day | Login/Join |
Beatification Candidate |
dang! I remembered a tall one, but for some reason the curtains got me today! Here's a new one: 
| |||
|
| Beatification Candidate |
and I even found the artwork somewhere else... 
| |||
|
| Incognito Beatification Candidate  |
So what's up with this one?  
| |||
|
Junior Member |
It seems quite clear to me ... Matthew
| |||
|
| Beatification Candidate |
Cool; ribs on the top side of the board. Hmmmmm, reverse crown on purpose? Usually you see them from the bottom: 
| |||
|
| Incognito Beatification Candidate |
Ron, I'm curious about your take as a tech on this one. With ribs below, we are fighting the tendency for the board to flatten under the load of the strings. With intentional reverse crown, it would seem that with proper bridge design for good down-bearing, the tendency would be for down-bearing to reinforce that crown instead of fighting it. What are your thoughts?
| |||
|
| Beatification Candidate |
Oh sure, just try to get me to think on a weekend! I'll have to get back to you on this one. I remember seeing something from Del Fandrich or Ron Nossaman in some old discussion about this very topic... I think Ric Brekne was in on the mix and it was pretty heated. (From pianotech@ptg.org for the youse udder gyce) Vibrating edge-constrained systems and all. (hmmm, I wonder what google images would think of that?!?)
| |||
|
| Incognito Beatification Candidate |
I think I read that discussion but I don't remember what was said or who had said what. When I posted my question, it came to mind. (Or didn't, really.  ) I do think Brekne was in there. And Nossaman's always in there.  I hadn't really thought much about the point at the time and have read so much since then that I now find myself reconsidering from a more serious perspective. Looking at the picture and thinking about the stresses in the system, it struck me that it might actually be the way to go, however unsightly. It seems it'd be highly unlikely to end up with "compression set" to any appreciable degree in that upside-down system. (The most expensive piano I know of that ever changed hands was a Bauer, but I don't know if it had that ribs-up board. It went for upwards of $1 mil.) Actually, I do now recall Del commenting on it, because I remember him saying he'd seen a Bauer that even had ribs on both top and bottom. [Edit: I was wondering about that "think on a weekend" comment, but dismissed it as you getting in the mood early. Then I called my accountant to find out what time she wanted to meet today. She was a little perplexed. Turns out it's not Friday at all now, but Saturday. Somehow I've misplaced a whole day. My memory or maybe general awareness is slipping more than I thought when I alluded to the haziness of my recollection about that Bauer discussion.  ]
| |||
|
| Beatification Candidate |
As I think about it a bit more it seems that the normally crowned board attempts a stasis of sorts.... the crown pushing up against the strings - as the wood looses the battle the board goes flat. In the Bauer system, once the wood looses the battle, it has nowhere to go but to break. I dunoo, I'll give it some more thought later
| |||
|
| Beatification Candidate |
back to pictures! As we got a little sidetracked on soundboard "crown", here's a little picture from the Kawai site attempting to show how the ribs, rim and soundboard are used to make the soundboard "hill-shaped" before stringing. When the load of the strings is added, the board ALMOST goes flat, but should still have a measurable amount of "hill" left. In fact, that's one thing a tech should check when looking at a used instrument. A lack of crown in the 5th octave in many Steinways is thought to be responsible for the "killer-octave" phenomenon; the lack of tone and sustain just where you'd want the melody to sing. 
| |||
|
| Incognito Beatification Candidate |
No cut-off bars? No fish? 
| |||
|
| Beatification Candidate |
| |||
|
| Incognito Beatification Candidate |
| |||
|
| Beatification Candidate |
While we're on the subject of soundboards, here's a picture of how the ribs are glued to the board. The "go-bars" provide clamping pressure off of the ceiling. (crown building) 
| |||
|
Minor Deity |
Heed the lesson of this picture: ALWAYS hold your New Year's Eve party out of the way of the piano!!
| |||
|
| Powered by Social Strata | Page 1 ... 45 46 47 48 49 50 51 ... 299 |
 | Please Wait. Your request is being processed... |
|