[CAUT] measuring wippen weight

[Barbara Richmond]

Hi Anne,

Thanks for the info, it's good to know--and will be fun to experiment with. (I love watching those numbers on the spread sheet--"Hmm, let's see what this does!").  Everything seems to be falling into place and fortunately, I've got wiggle room with the FWs, too.  

Barbara Richmond



  ----- Original Message ----- 
  From: Garee, Anne E. 
  To: College and University Technicians 
  Sent: Tuesday, October 02, 2007 2:23 PM
  Subject: Re: [CAUT] measuring wippen weight


  Barb,

  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.  However, the KR you read on the metrology table will be about the same with or without the half punching and is a bit of a challenge to get consistent readings on the jig with the half punching installed.  

   

  I have run around the block with quite a few actions chasing the ratio.  I have learned to pull back and readdress geometry before continuing the chase.   The FW ceiling chart is very useful to keep you from adding too much lead.

  Anne    

   


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  From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Barbara Richmond
  Sent: Friday, September 28, 2007 3:23 PM
  To: College and University Technicians
  Subject: Re: [CAUT] measuring wippen weight

   

  Hi Anne,

   

  Well, this piano has low KR (4.5-4.6) and moving the capstan backwards put the heel even closer to the wip flange--adding friction and then the amount of lead I'd have to put in the keys...well...it seemed like I was going in the wrong direction.  I spent a lot of time trying all sorts of combinations.  The replacement wips lower the friction compared to the originals.  I also feel better about using new parts.  The old ones weren't horrible, but they weren't going to get any younger, either.  

   

  The WW turned out to be 20.6.  

   

  BTW, is there a way to measure the KR when using a half punching on the front or back of the balance hole?  I haven't thrown any keys up on the Stanwood gizmo and try, of course.  There's the obvious BW difference, just wondering about the KR number.

   

  Thanks for your help.

   

  Barbara Richmond, RPT

  near Peoria, Illinois

   

   

    ----- Original Message ----- 

    From: Garee, Anne E. 

    To: College and University Technicians 

    Sent: Wednesday, September 26, 2007 4:45 PM

    Subject: Re: [CAUT] measuring wippen weight

     

    Barb,

    If "front heavy" means heel moved towards the jack, the result is a lower WW.  Heel moved towards the flange will be a higher WW.  I put a heel on a rep at an extreme position towards the flange and balanced it on the scale.  I could get as high as a 20 gram WW and then the rep would not stay on the jig (which might be your original question).  The heel position was so extreme at that point, that one might question whether this design will function well this far out of the box.  

    Anne

     


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    From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Barbara Richmond
    Sent: Wednesday, September 26, 2007 2:57 PM
    To: College and University Technicians
    Subject: Re: [CAUT] measuring wippen weight

     

    Thanks, Anne.

     

    I will give your suggestions a try.

     

    So, in the great scheme of things, is there something I should know about front heavy wippens? 

     

     

    Barbara Richmond

    near Peoria, Illinois

      ----- Original Message ----- 

      From: Garee, Anne E. 

      To: College and University Technicians 

      Sent: Wednesday, September 26, 2007 9:30 AM

      Subject: Re: [CAUT] measuring wippen weight

       

      Barb,

      If it is tipping to one side, trim the damper felt on your scale pan jig to off-set it a bit.  You can then turn the jig around for two different angles.  Make sure you have soaked the jig felt in lacquer to stiffen it and create a bit more friction.  You can also slightly rough up the bottom of the angled flange that sits on the roller or put a bit of spray adhesive on it temporarily.

      Anne Garee

      Florida State University

       


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      From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Barbara Richmond
      Sent: Wednesday, September 26, 2007 8:40 AM
      To: College and University Technicians
      Subject: [CAUT] measuring wippen weight

       

      Howdy,

       

      I have some Renner Steinway wips that I'm altering to fit a Knabe.  Be joyful that I'm not going to tell the story of all the testing I've done on this action.  Anyway, besides replacing the flanges (obviously), I'm having to move the heel backwards (toward the flange).  When the wips were in their original state, the WW was 17.  Now with the heels moved and the little/angled Knabe flanges on, I can't get the wip to balance so I can get a reading.  Do I just hold it lightly against the "tower?" or tie it with thread or use a rubber band or just ignore it?

       

      This wippen set up is the best (of the many) I've tried--feels good, less friction.  I'm just curious about the numbers. 

       

      Thanks,

       

      Barbara Richmond, RPT

      near Peoria, Illinois
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