[CAUT] Re: Petrof Wippen Rail

[Horace Greeley]

Jim,

Very well said.  Thank you.

Best.

Horace


At 09:04 AM 1/5/2005, you wrote:
>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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