[CAUT] center pinning changes/ long pin method

[Joe And Penny Goss]

Hi Fred, Those were made special for you. Always wondered if you liked them. Now know.
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: Fred Sturm 
  To: College and University Technicians 
  Sent: Tuesday, September 11, 2007 10:31 AM
  Subject: Re: [CAUT] center pinning changes/ long pin method


  Hi Jim,
  Can you describe the long pin method? We discussed something along those lines on this list a while back, but I never got all the details. I understand one is using pins long enough to go through several flanges, but I'm not clear how exactly one proceeds. Does the whole length of the long pin get pushed through the bird's eye of each flange? That seems awfully cumbersome and potentially a bit destructive.
  Joe Goss has long burnishers - very long as in a meter or so - for all American sizes of pins, and those can be used as you describe for pulling through the bushing. I must say I am a bit skeptical about the idea that it makes much difference doing the pulling in one direction, but maybe you're right.
   In burnishing center felt, it seems to me that the burnisher is going to be pressing against the felt hard enough that fibers wouldn't be able to move around, at least significantly. At this point in my own work I mostly do a rapid back and forth action, fast enough and enough of them to create a good bit of heat. (You can get heat pulling the burnisher through all the way rapidly, but  I think I get more heat faster by doing back and forth, as the metal of the burnisher heats up). That seems to set the felt quite nicely. And it seems to be possible to move up a half size to a full size just using burnishing action without removing any felt, just the ironing action. I haven't been doing it this way long enough to have a good sense for longevity and whatnot, but it seems to be good so far. Certainly makes sense, as long as the felt in the bushings doesn't swell later, maybe due to humidity rise, and make the centers sluggish, and I haven't found that in university pianos, which get quite a bit of use. Of course I am dealing with my own humidity environment, which is typically 10% to 60% range. 

  Regards,
  Fred Sturm
  University of New Mexico
  fssturm at unm.edu






  On Sep 10, 2007, at 12:48 PM, Jim Busby wrote:


    Hi Ted,




    Just some feedback on the "long pinning method" you mention below

    (Thanks Jurgen!). I have been doing this for quite a while now and it

    seems to have much more longevity and be more stable than other methods.

    I think it is because the long pin pulls one direction through the

    center, thus "combing" the fibers in one direction and packing them in

    tight. When I use other back and forth burnishing techniques and "shake

    down" the parts the grams may go from say 5 to 4 or 3 until they become

    immovable. With the long pinning method there is no "shaking down"

    necessary or possible. Either way is good and can be done to perfection,

    but this "European way" is becoming my preferred method because of this

    instant and permanent stability and better longevity. Better Longevity

    means that I repin about every 3-4 years instead of every 2-3 years. It

    may be even better than that because I'm at about 4 years since I

    started using the method and some are still good!




    Regards,

    Jim Busby BYU


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