Thanks everyone for the ideas. Looks like it's time to experiment. I actually have Nick's geometry software but haven't used it for awhile because I like Stanwood's methods. Using weight instead of distance seems more direct and easier (and probably more accurate). Alan > From: Richard Brekne <Richard.Brekne@grieg.uib.no> > Reply-To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org> > Date: Wed, 20 Oct 2004 09:01:48 +0100 > To: <ed440@mindspring.com>, "College and University Technicians > <caut@ptg.org>" <caut@ptg.org> > Subject: Re: [CAUT] Moving capstans > > Nicks program does not yeild the same BW result that Stanwoods formula > does. It is based on Pfieffers formula unless I am mistaken and results > in a different ratio quantity. It can be used as a reference for sure... > but it will not yeild the Balance Weight Ratio as it does not take into > consideration any angles of any of the parts in any given position. It > simply breaks the levers down into three individual ratios as free > standing levers, and multiplies the results together. > > It can give you a general idea, but remember if you move either the > knuckle or the capstan.. you are essentially really moving the jacktop > and whippen cushion respectively as well. > > Cheers > RicB > > Ed Sutton wrote: > >> Alan- >> >> Nick Gravagne has a program for sale to do what you want. He offers 2 >> weeks' free trial. <http://home.att.net/~nickware/action.htm> >> >> I haven't tried it, but it looks good. >> >> Some pianos may work better with different capstan lines for naturals and >> accidentals. >> >> In the end you will have to do practical trials anyway. I have a capstan on >> a block of wood on the end of a stiff wire. I can fish quickly to get some >> rough ideas of what will work. >> >> Also, some light go bars over the bench make it faster to pull and replace >> the stack >> >> Please let us know how it goes if you try Nick's program. >> >> Ed Sutton >> >> >> >> >>> [Original Message] >>> From: Alan McCoy <amccoy@mail.ewu.edu> >>> To: College and University Technicians <caut@ptg.org <caut@ptg.org> >>> Date: 10/19/2004 5:58:21 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 >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> caut list info: https://www.moypiano.com/resources/#archives >>>>> >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> caut list info: https://www.moypiano.com/resources/#archives >>>> >>>> >>> _______________________________________________ >>> caut list info: https://www.moypiano.com/resources/#archives >>> >>> >> >> >> >> _______________________________________________ >> caut list info: https://www.moypiano.com/resources/#archives >> >> >> > > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives
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