[CAUT] measuring wippen weight

[Ed Sutton]

Keep this up, you're solving my problems!
Thanks!
Ed Sutton

----- Original Message ----- 
From: "Alan McCoy" <amccoy at mail.ewu.edu>
To: <caut at ptg.org>
Sent: Tuesday, October 02, 2007 7:40 PM
Subject: Re: [CAUT] measuring wippen weight


> Jon, Anne, Barbara
>
> I think she does indeed mean a 0.4 change in the action ratio (not a 0.04
> change in key ratio).
>
> Bob Marinelli and I were talking about this the other day and he mentioned
> that using a half-punching will result in a .5 change in the action ratio. 
> I
> have not verified this independently yet, just reporting what Bob said.
>
> I am currently working on a M&H BB with a 0.57 key ratio. I just put half
> punchings on it and will install miracle wips to move the wip heel closer 
> to
> the balance rail. I need to get the key ratio down to about 0.52, which 
> will
> get my action ratio down from 6.5 to about 5.8. Then I'll be able to weigh
> it off at a 38 BW using only a 3-2-1-0 lead pattern (and minimal spring
> assist). As it was I was going to need 5-4-3-2-1 leading pattern and a 42
> BW. Not acceptable for this situatio. This with a newly made set of keys
> (not Pianotek)!
>
> :-(
>
> Alan
>
>
>> From: Jon Page <jonpage at comcast.net>
>> Reply-To: "College and University Technicians <caut at ptg.org>" 
>> <caut at ptg.org>
>> Date: Tue, 02 Oct 2007 16:52:03 -0400
>> To: <caut at ptg.org>
>> Subject: [CAUT]  measuring wippen weight
>>
>>> There is a .4 change in action ratio either up or down when the half
>>> punching or balance rail veneer is used to help correct a high or low R
>>
>>
>> I think you mean .04 change.  I have use b/r shims twice to lower KR
>> (moving the fulcrum back) and friction.  It was used because nothing
>> else worked satisfactorily.
>> -- 
>>
>> Regards,
>>
>> Jon Page
>
>