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Re: Shank Center Pin Friction
Olek #2067114 04/19/13 12:56 PM
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Originally Posted by Olek
I am sure the resiliency of the cloth have a tonal role as a chock adbsorber.


Yes, it absorbs energy that would otherwise be transmitted into the string.


Keith Akins, RPT
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Re: Shank Center Pin Friction
kpembrook #2067122 04/19/13 01:07 PM
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Originally Posted by kpembrook
Originally Posted by Olek
I am sure the resiliency of the cloth have a tonal role as a chock adbsorber.


Yes, it absorbs energy that would otherwise be transmitted into the string.


Well, certainly no ! When you hammer a nail, it is not good to keep a rigid wrist at impact moment... Pfeiffer noticed that on the linked key level, it adbsorb energy to have the parts retained.

But what I suspect is that the impact is more reflected in the action, hence that raise of the tonal power mostly at impact, not a milisecond later as it is the case with usual centers. So the part of tone I use for tuning is not enghanced...


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Re: Shank Center Pin Friction
Olek #2067126 04/19/13 01:17 PM
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Originally Posted by Olek
Originally Posted by kpembrook
Originally Posted by Olek
I am sure the resiliency of the cloth have a tonal role as a chock adbsorber.


Yes, it absorbs energy that would otherwise be transmitted into the string.


Well, certainly no ! When you hammer a nail, it is not good to keep a rigid wrist at impact moment... Pfeiffer noticed that on the linked key level, it adbsorb energy to have the parts retained.

But what I suspect is that the impact is more reflected in the action, hence that raise of the tonal power mostly at impact, not a milisecond later as it is the case with usual centers. So the part of tone I use for tuning is not enghanced...


A friend was so enthusiastic with his zero friction centers, in the end the pianowas not giving control. He changed the shanks.


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Re: Shank Center Pin Friction
Olek #2067163 04/19/13 02:43 PM
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Quote
A friend was so enthusiastic with his zero friction centers, in the end the pianowas not giving control. He changed the shanks.


Yes, zero friction probably would not be good. Less than what felt requires might. Solid bushing always provide the option of higher friction. Felt does not provide a realistic option of lower friction.


Keith Akins, RPT
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USA Distributor for Isaac Cadenza hammers and Profundo Bass Strings
Supporting Piano Owners D-I-Y piano tuning and repair
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Re: Shank Center Pin Friction
kpembrook #2067388 04/20/13 12:00 AM
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Hi Keith,

Nothing is absolutely rigid, but you are right, cloth bushings have give and hard bushings have much less give or they would be noisy (remember teflon bushings?). I haven't done any direct measurements or hi-speed camera research, but it makes sense to me that the shank pinning needs to provide some damping to prevent the shank, especially when loaded with a heavy hammer, from bouncing too much. I'd be curious to hear from anyone who has experience in this area.

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