[CAUT] Moving capstans

Alan McCoy amccoy@mail.ewu.edu
Mon, 25 Oct 2004 08:35:59 -0700


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Hey Chris,

The correct URL for the spreadsheet is here:

http://www.ptg.org/files/20041019125312.xls

Your comments are welcomed.

Alan





> From: Chris Solliday <solliday@ptd.net>
> Reply-To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org>
> Date: Fri, 22 Oct 2004 21:19:11 -0400
> To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org>
> Subject: Re: [CAUT] Moving capstans
> 
> well actually the process is usually done the other way around. I realize I
> stuck my foot in my mouth (again) and oversimplified. Ric, Ed, and David
> have given you good advice. And at the risk of beating a subject that you
> have already laid to rest... the real answer to your original question is
> there isn't one but what i hope that you are aware of is that in this
> process we know what ratio is, we know what strike weight is, we can know
> the front weight, and we have an intended balance weight that we are trying
> to get and so we could find for KR but it is alot simpler to float the boat
> (capstan). Afterall who is using other than a 17mm knuckle? and why would
> you?  And the leaway here is very small, ratio is between 5.3 and 5.7 on
> good actions, bw 35-45 and if you can't get enough down with the capstan
> there is always the balance rail punching or shim trick further changing KR.
> Nick G's program is useful fun but ballpark. I could be more specific if I
> had been able to see the chart but it has been removed and wasn't readable
> at first. If you're going to do this kind of work I hope you will consider
> becoming a licensed Stanwood installer. And that goes for you other guys
> too, Ric excepted and accepted. Chris
> ----- Original Message -----
> From: "Alan McCoy" <amccoy@mail.ewu.edu>
> To: <caut@ptg.org>
> Sent: Tuesday, October 19, 2004 5:58 PM
> Subject: Re: [CAUT] Moving capstans
> 
> 
>> Hi Chris,
>> 
>> I know the formula for R, etc. I could also just physically move a capstan
>> and recalculate. The question though is how to predict the change in BW
>> resulting from moving a capstan or knuckle, before actually moving it (as
>> per the analysis sheet).
>> 
>> Alan
>> 
>> 
>>> From: Chris Solliday <solliday@ptd.net>
>>> Reply-To: "College and University Technicians <caut@ptg.org>"
> <caut@ptg.org>
>>> Date: Tue, 19 Oct 2004 16:43:31 -0400
>>> To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org>
>>> Subject: Re: [CAUT] Moving capstans
>>> 
>>> SR= BW+FW-(KRxWW) divided by SW the rest is simple math.
>>> ----- Original Message -----
>>> From: "Alan McCoy" <amccoy@mail.ewu.edu>
>>> To: "CAUTlist" <caut@ptg.org>
>>> Sent: Tuesday, October 19, 2004 4:28 PM
>>> Subject: [CAUT] Moving capstans
>>> 
>>> 
>>>> Hi Folks,
>>>> 
>>>> I'd like to pick some of your brains about a problem action. I thought
> it
>>>> might help the discussion to include my spreadsheet, but the list
>>>> administrator thought it better to separate the attachment. If you want
>>> to,
>>>> please go to http://www.ptg.org:1406/files/20041019125312.xls for the
>>>> worksheet.
>>>> 
>>>> Is there some way to calculate how much BW will change when moving
> either
>>>> the knuckle or the capstan? Or does anyone have enough experience/data
> for
>>> a
>>>> rule of thumb for this calculation?
>>>> 
>>>> Comments?
>>>> 
>>>> Thanks.
>>>> 
>>>> 
>>>> -- Alan McCoy, RPT
>>>> Piano Technician
>>>> 
>>>> Eastern Washington University
>>>> 119 Music Bldg
>>>> Cheney, WA 99004
>>>> 
>>>> (509) 359-4627
>>>> amccoy@mail.ewu.edu
>>>> 
>>>> 
>>>> 
>>>> 
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