Yamaha spring cord replacement

[Joe And Penny Goss]

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Use SPIDER WIRE available in fishing supply stores Walmart etc.
Joe Goss RPT
Mother Goose Tools
imatunr@srvinet.com
www.mothergoosetools.com
  ----- Original Message -----=20
  From: David Ilvedson=20
  To: pianotech@ptg.org=20
  Sent: Wednesday, September 21, 2005 9:39 AM
  Subject: Re: Yamaha spring cord replacement



  I would only ask where do we get the dacron of appropriate size?

  David I.

  PS   Good description Tom!




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-----
  Original message
  From: Piannaman@aol.com
  To: pianotech@ptg.org
  Received: 9/21/2005 3:29:38 AM
  Subject: Re: Yamaha spring cord replacement


  In a message dated 9/21/2005 6:43:43 AM Pacific Standard Time, =
piano57@insightbb.com writes:
    Hello folks who are more organized than I am,

    Oh groan. I saved the instructions (on a disk) for replacing those =
pesky little spring cords and now I can't find it.  Would someone please =
send them along to me  (You know, the instructions that include removing =
the hammer rail.).  Though I read them--a long time ago--I can't =
remember all the details (Guess I've been eating too many aluminum =
bushing cauls), like how long the job is supposed to take.

    Thanks,

    Barbara Richmond, RPT

  Barbara,

  Here are instructions.  I got them from Tom Cole, RPT.  He can do it =
in around 2 hours, give or take. I'm sure his shop area is far more =
efficiently organized than what I was using at the time.  The first time =
took me around 4, second time was about 3 hours.  I see another one on =
the horizon soon!

  Dave Stahl


  Problem:
  Hammer return spring cords are breaking due to unknown cause
  Symptoms:
  Cords have become a brownish color
  Random breakage is occuring
  Touchweight is affected on some notes; hammer sometimes falls into =
strings on slow release
  Solutions:
  Replace hammer flanges
  Replace cords
  Condition of action:
  If condition of the hammers, pinning, and travelling/mating to strings =
all good, replace cords.
  If pinning is poor then flange replacement may be a better option.
  Cord Replacement Procedure:
  1. Place action in action cradle
  2. Remove hammer rest rail and treble bracket
  3. Loosen hammer butt plate screws
  4. Remove hammer assemblies from flanges and let hang from bridle =
wires
  5. Straighten any bent return springs
  6. Tighten all hammer/damper/wippen flange screws
  7. Tilt action 90=B0 so that the hammer flange cord slots face up
  8. Using specially adapted shimming chisel, clean slots and vacuum up =
debris
  9. Wrap 90+ turns on dowel with new cord and cut turns with razor
  10. Glue one end of each piece to one slot on each flange
  11. Return to the first flange and trim each cord to length
  12. Glue other end to remaining slot; check with gauge
  13. Replace hammers; tighten butt plate screws; hook springs under =
flange cords as you go
  14. Replace hammer rest rail bracket and reinstall rest rail
  15. Final check; jack springs engaged with jacks, spring cords in hook =
of hammer return springs, bridal tapes not twisted
  Tools and Materials:
  =AE flange screwdriver
  =AE thin screwdriver
  =AE Phillips screwdriver
  =AE shimming chisel modified to clean flange slots
  =AE glue applicator (syringe) filled with Tightbond
  =AE end nippers with gauge
  =AE action cradle
  =AE replacement cord (braided Dacron of suitable diameter)
  =AE 5/8" dowel [9/16"]
  =AE blunted scriber
  =AE gauge (dowel)
  =AE razor
  =AE forceps
  =AE damp rag

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