Yamaha Jack issue

[Joe And Penny Goss]

Humm,
Would the action support screw have anything to do with  how the jack returns? 
The screw that should be against the plate to stabelize the action due to Yamaha using less than 4 action brackets>
Also the hammer shanks usually are longer in the low tenor section section and may contribute to the problem.
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: Steve Blasyak 
  To: pianotech at ptg.org 
  Sent: Wednesday, March 19, 2008 9:28 AM
  Subject: Yamaha Jack issue


  Terry,
   
  I had the same problem with an M 500 a couple of weeks ago. I have had similar problems/ issues with consoles or uprights in the past usually in the high treble were the hammers are lighter. I always considered this a key weighting issue. This particular instance was at B 1. Checked all friction, whippen, jack and hammer. All good, in fact if anything they were pinned too loose. Tried more lost motion, lubricated jack, teflon on butt leather. Increased key dip. Increased jack spring tension. Nothing worked. Well in the end, with the damper pedal depressed and rapidly playing the note it would fail after about twenty repetitions. Under normal playing, if the jack failed to return under the hammer butt, as soon as you release the damper pedal the jack would slip back under the hammer butt. So I told the client "that's as good as it gets", and called it a day. Driving away, I tried to rationalize that it was an unexplained phenomenon. I could not escape the feeling of failure to solve the problem.
   
  One thing that was mentioned by someone I can't remember who. What would the key bed have to do with this phenomenon?  
   
  Steve Blasyak
  Orange County Ca.
   
  Pura Vida



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