[CAUT] moving capstans question

[Ted Sambell]

Whenever there are more than three leads in the front of the keys, a red flag should go up. And do not neglect to check the centerpin to knuckle distance; if it is 15mm it could benifit by replacing with new shanks with a distance of 17mm. An excellent resource is the Renner parts kit, which enables one to try different combinations of repetitions and hammershanks. The kit is free  with the purchase of a set of replacement parts. Also, look up the Pianotek catalog, which carries a wide range of parts in actual size, and with  the dimnesions marked.
Moving the capstans is a big decision, as not only the weght is changed, but the ratio of keydip to hammer blow distance. If nothing else works, consider the Renner repetitions (wippens) with the 'Turbo ' springs.

Ted Sambell
  ----- Original Message ----- 
  From: Paul T Williams 
  To: College and University Technicians 
  Sent: Friday, September 21, 2007 12:33 PM
  Subject: Re: [CAUT] moving capstans question



  David, 

  I forgot to mention that there are 6 leads in the lowest bass keys and 5 through the middle and 3-4   three forths of the rest of the way!  Steinways attempt at compensating I suppose...  What I don't understand is why did they mess with a good thing? 




        "Porritt, David" <dporritt at mail.smu.edu> 
        Sent by: caut-bounces at ptg.org 
        09/21/2007 10:03 AM Please respond to
              College and University Technicians <caut at ptg.org> 


       To "College and University Technicians" <caut at ptg.org>  
              cc  
              Subject Re: [CAUT] moving capstans question 

              

       



  Paul: 
    
  I’m certainly not an action guru but last year I did move a capstan line 6 - 7 mm forward on a Baldwin SF-10.  It made a very nice difference.  The DW had been in the high 60s and it came down to the low 50s and felt much better.  Fortunately with that move the capstan was still in a good area of the wippen heel so I didn’t have to cut the heels off and move them. 
    
  dave 
    
  David M. Porritt, RPT 
  dporritt at smu.edu 
    
  From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Paul T Williams
  Sent: Friday, September 21, 2007 9:34 AM
  To: caut at ptg.org
  Subject: [CAUT] moving capstans question 
    

  Hi List! 

  Happy Friday! 

  I am working on a 70's Sty B with a horrible action geometry problem. All the students and the professor hate playing it and I don't blame them! The line from key balance hole to wip has the capstan way too low making the DW close to 70g throughout.  It has a renner action and hammers.  the wips and capstans are such that I could relocate the capstans back by about 3-4mm.  Would that make a big enough difference in the DW? It won't affect the line.  I looked at raising the stack, but there isn't enough room to raise it more than 1-2mm.  Should I try both? 

  Also, is the measurement in Steinways made from center of balance rail hole on the top of the key, or from the back of the key?  This is a new endeavor for me and I don't want to make things worse. 

  Still green in Lincoln, 

  Paul 
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