This is a forwarded message From: "Clark Sprague" To: Pianotech Received: 9/21/2005 5:33:47 PM Subject: Re: Yamaha spring cord replacement I've used #6 Fly line, worked well! Clark A. Sprague, RPT ----- Original Message ----- From: Joe And Penny Goss To: ilvey at sbcglobal.net ; Pianotech 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 at srvinet.com www.mothergoosetools.com ----- Original Message ----- From: David Ilvedson To: pianotech at ptg.org 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! Original message From: Piannaman at aol.com To: pianotech at 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 at 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° 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: ® flange screwdriver ® thin screwdriver ® Phillips screwdriver ® shimming chisel modified to clean flange slots ® glue applicator (syringe) filled with Tightbond ® end nippers with gauge ® action cradle ® replacement cord (braided Dacron of suitable diameter) ® 5/8" dowel [9/16"] ® blunted scriber ® gauge (dowel) ® razor ® forceps ® damp rag -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/caut.php/attachments/20060604/ada299be/attachment.html
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