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Re: Yamaha's are considered bright..... why? [Re: AWilley] #2903840 10/23/19 08:54 PM
Joined: Aug 2013
Posts: 193
E
Ed Sutton Offline
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Joined: Aug 2013
Posts: 193
Originally Posted by AWilley
Originally Posted by BDB
So you are saying the springs have no part in the resistance of the hammers to movement? Somehow I doubt that.

I don't think Ed said that precisely. He said "inertial resistance of the hammers" which I interpret as "moment of inertia" which doesn't have anything to do with the springs.

Anthony-Yes, your terminology is correct.
The hammer return springs matter most for faster return of the hammers from the strings, since the hammers are almost vertical when they are touching the strings. This is also the point in the cycle when the springs are most compressed and are exerting the most force.
I think you'll find that when the springs are loosened from their loops (or the loops are broken), there is not much perceptible difference at the beginning of the keystroke, but there may be a slower repetition, especially in the low tenor.
If, on the other hand, you randomly add weight to some of the hammers, you will probably feel a difference and find it difficult to control dynamics.
Weighing off the hammers and evening the strike weight line is very fast and easy, well worth trying when replacing hammers on a good vertical like the U-3.
And if the spring cords are breaking, they need to be replaced.


Ed Sutton, RPT
Just a piano tuner!
Durham NC USA
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Re: Yamaha's are considered bright..... why? [Re: Ed Sutton] #2903901 10/24/19 04:05 AM
Joined: Dec 2018
Posts: 631
U
U3piano Offline OP
500 Post Club Member
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U
Joined: Dec 2018
Posts: 631
Originally Posted by Ed Sutton
Originally Posted by AWilley
Originally Posted by BDB
So you are saying the springs have no part in the resistance of the hammers to movement? Somehow I doubt that.

I don't think Ed said that precisely. He said "inertial resistance of the hammers" which I interpret as "moment of inertia" which doesn't have anything to do with the springs.

Anthony-Yes, your terminology is correct.
The hammer return springs matter most for faster return of the hammers from the strings, since the hammers are almost vertical when they are touching the strings. This is also the point in the cycle when the springs are most compressed and are exerting the most force.
I think you'll find that when the springs are loosened from their loops (or the loops are broken), there is not much perceptible difference at the beginning of the keystroke, but there may be a slower repetition, especially in the low tenor.
If, on the other hand, you randomly add weight to some of the hammers, you will probably feel a difference and find it difficult to control dynamics.
Weighing off the hammers and evening the strike weight line is very fast and easy, well worth trying when replacing hammers on a good vertical like the U-3.
And if the spring cords are breaking, they need to be replaced.


My piano actually has some broken spring cords, I do think i feel it effects playability, as in harder to control timing and dynamics. Im nowhere near an advanced player so i don't mind the loss in repetition, but i also think the keys with broken cords tend to double strike (bobble), does that make sense?

I measured the downweight on about 40% of the white keys with a set of gram weights, and wrote it down. From the result i could see which keys had broken cords, because these keys all were about 7 grams lighter on average compared to the other keys, which had just differences of a couple of grams otherwise. I checked the cords and the results i wrote down matched the broken ones. Ill have them fixed soon.

Re: Yamaha's are considered bright..... why? [Re: U3piano] #2903945 10/24/19 08:09 AM
Joined: Dec 2008
Posts: 133
B
Bourniplus Offline
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Joined: Dec 2008
Posts: 133
Originally Posted by U3piano
i also think the keys with broken cords tend to double strike (bobble), does that make sense?

Absolutely. Broken spring cords will definitely increase the risk of bobbling.


Musician / tuner
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