concert service Q & A

[Joe And Penny Goss]

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
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