Yamaha spring cord replacement

[Clark Sprague]

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I've used #6 Fly line, worked well!  Clark A. Sprague, RPT
  ----- Original Message -----=20
  From: Joe And Penny Goss=20
  To: ilvey@sbcglobal.net ; Pianotech=20
  Sent: Wednesday, September 21, 2005 12:01 PM
  Subject: Re: Yamaha spring cord replacement


  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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