Hi Mark, What material is the hold down devise in the block? If it is brass, somthing other than a plated pin that is brass would work better. Nylon and polished steel? Just thinkin' Joe Goss imatunr@srvinet.com www.mothergoosetools.com ----- Original Message ----- From: "Mark Cramer" <Cramer@BrandonU.CA> To: "CAUT" <caut@ptg.org> Sent: Tuesday, May 04, 2004 10:51 AM Subject: concert service Q & A > preparing for the Egré Competition this past week, I encountered > squeeking/groaning/ticking sounds while pressing certain notes slowly. > > It wasn't the knuckles, (did the reference to "ticking" give it away?) it > was the repetition springs in their slots. > > Three 3 years previous, I had polished the springs and > cleaned/burnished/treated the slots with a pencil, so there was no "gunk" to > deal with, just contact parts that needed service... fast! > > Answer: > > the answer was found in a tip Fred Sturm provided (as I recall it), about a > year ago: > > "bend a wire-mute handle into a letter "J," with the point blunted, release > the spring, then use the hook to reach under and clean/burnish the slot." > > I actually used a peice of music wire perhaps twice the diam. of the > springs, doubling it over for a rounded burnishing surface. Then, with > vice-grips as a tool-handle, lifted the balancier to the drop-screw, and > used a generous amount of burnishing force. > > The idea being; to re-create a "work-hardened" round-bottomed spring-slot, > both wider and longer than the spring path. > > It occurs to me now, if the pencil used 3 years ago was too sharp, I may > have actually created the grooves that were now causing noise/friction. > > In any case, Fred's idea works very nicely, and very quick! The springs move > freely, quietly and faster than a one-armed paper-hanger! :>) > > Question: > > I'm having trouble with key-frame shift-pins; noise/friction from the > bass-side in particular. > > I've squared the pin to the key-bed, rotated the pin to the last fresh side, > then finally ended up filing all four surfaces, rounding the aris's, then > fine-sanding, polishing and lubrifying. > > I've re-bedded the key-block to provide no more than sufficient down > pressure, and rounded the pin-guide (brass) and finally burnished the > contact surface to a shine. > > Everything was slick for the competition, however this morning it seems the > mild scraping sound has returned. When I remove the block, I'm afraid I'll > see the fine tell-tale abrassion marks again > > Any long-term solutions? > > Replace the shift pin(s)? > > Re-fit the key-block to a Yamaha system? > > Help? > > Meanwhile, I'll go leaf through some previous PT-Journals, as this topic > kind of rings a bell. > > thanks, > Mark Cramer, > Brandon University > > > > > > > > > > > > > > > > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives
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