[CAUT] Re: Petrof Wippen Rail

[Ed Sutton]

Jim-
Beautifully said.
When are you going to write a book?
Ed S.


> [Original Message]
> From: James Ellis <claviers@nxs.net>
> To: <caut@ptg.org>
> Date: 1/5/2005 11:47:49 AM
> Subject: [CAUT] Re: Petrof Wippen Rail
>
> I'm a little concerned about some of the suggestions being tossed around
> here.  Someone said raising the back action bracket feet would not affect
> the "magic line" through the capstan/wippen-heel contact.  Oh, but it
will!
>  Someone else suggested raising the front of the wippen rail, and tilting
> it.  Why?  If you just tilt the rail backward, but otherwise leave it
where
> it is, it will change the magic line a little but, but it will screw up
the
> action spread a lot more, pull the wippens back, and you'll end up with a
> bunch of broken jacks if you aren't careful.  Raising the back of the rail
> and tilting it forward would do the opposite.  But why tilt the thing in
> the first palce?  I can't see it.
>
> Here's my suggestion for anyone who has a good knowledge of action
> geometry.  Just use your own good common sense, and forget all those
"quick
> fixes".  They may be appropriate, but they may not.  Unless that "magic
> line" is way off, and the capstans are rough, it's not going to amount to
> very much anyway.  If it all lines up at some point during the key stroke,
> it may not be ideal, but it won't be very far off either.
>
> I'm not nearly as concerned about an actual measurement of action spread
as
> I am about where things are.  Look at the positions of the jacks in the
> balancier windows, and where they end up on a hard firm blow with the key
> bottomed out hard.  If they are slammed up against the felt at the fronts
> of the windows, you are in trouble, and can expect broken jacks.  If the
> jacks end up wedged between the knuckles and the balancier windows when
the
> key bottoms, you can expect jamming repetition.  If the tops of the jacks
> are still a mile away from the fronts of the windows when the key is
> bottomed out hard, you can expect occasional skipping and cheating on fast
> repetition.
>
> Sincerely, Jim Ellis
>
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