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#646327 - 02/04/09 05:38 PM Action Center  
Joined: Nov 2007
Posts: 42
mitech Offline
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mitech  Offline
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Joined: Nov 2007
Posts: 42
Michigan
Can someone define what parts make up the "Action Center" in a Grand please?

Thank you


Mark

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#646328 - 02/04/09 05:43 PM Re: Action Center  
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JDelmore Offline
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JDelmore  Offline
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There's no one "Action Center", Mark. The action centers are the pinned joints, i.e., flange to hammershank, flange to wippen, etc.


PTG Associate Member

"There is always room above; there is only the ground below."....F.E. Morton (with props to Del F.)
#646329 - 02/04/09 05:47 PM Re: Action Center  
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mitech Offline
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mitech  Offline
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Joined: Nov 2007
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Michigan
That was my thought.
But I had a (cowboy?) technician tell me that if I lubed the action center "joint" on a grand, it would decrease it's touchweight...

Thank you for clarifying...


Mark

PTG Associate Member
#646330 - 02/04/09 05:52 PM Re: Action Center  
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JDelmore Offline
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JDelmore  Offline
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Run away run away!!!

There's so much more to touchweight than that (and I'm certainly no expert). The centers need their proper amount of friction. If they're tight, they need proper sizing or repinning. Not a big fan of "lube"...


PTG Associate Member

"There is always room above; there is only the ground below."....F.E. Morton (with props to Del F.)
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#646331 - 02/04/09 06:07 PM Re: Action Center  
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James Senior Offline
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James Senior  Offline
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England
Actually,
I did some careful measurements on this, and in the most impressive cases, I found that putting CLP on the hammer shank action centres reduced the friction (DW-UP/2) by up to 15g.

It just depends on what condition the instrument is in the first place!

If you're concerned about touchweight, check all sources of friction, polish pins and capstans, check whippen heel felt etc, BEFORE you do anything drastic like adding weights etc.

ps: I'm only an amateur tech, but I doubt anyone will disagree with what I've said...(flameproof suit time?)

#646332 - 02/04/09 06:14 PM Re: Action Center  
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James Senior Offline
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James Senior  Offline
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England
Also...
CLP isn't what you're thinking of as 'lube'. It's a synthetic chemical which cleans oxide and dirt of the pins. The only lubricant I have ever used is talcum power and teflon powder on knuckles and key bushings.

I have seen some people suggest other actual liquid lubricants but personally I would NOT do this ever. (someone here uses a bio-oil for gun barrels for example).

As JDelmore said, there's a lot more to downweight than friction. However, if the instrument used to be fine, then increased friction could well be the cause.

#646333 - 02/05/09 10:04 AM Re: Action Center  
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mitech Offline
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mitech  Offline
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Joined: Nov 2007
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Michigan
Thank you, all !


Mark

PTG Associate Member
#646334 - 02/06/09 09:26 PM Re: Action Center  
Joined: May 2004
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Keith Roberts Offline
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Keith Roberts  Offline
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Posts: 2,002
Murphys, Ca
Sometimes it's a mistake to get technical. He probably calls it that because you can get into long detailed explnations that won't make any real sense to the client anyway. So he might just call all the moving parts, the action center. It is so wrong to jump all over a person because they used a generalized explanation. He had the problem right. The friction needs to be dealt with and the DW will come down.


Keith Roberts
Keith's Piano Service
Hathaway Pines,Ca

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