These spec's are supposedly for all Yamaha grands (from handouts at Little Red Schoolhouse): keyboard front bushing 0.3 mm lateral movement keyboard center bushing 0.1 - 0.2 (mm, I presume) lateral movement white key height 64 mm from keybed to underside of key covering black key height 12 mm above white key key dip 10 mm repetition lever height 0.2 mm above jack hammer to string 48 mm let-off 3 mm in bass graduating to 1.5 mm in treble drop let-off plus 2mm (i.e., 2 mm below point of let-off) back check 15 mm (from string) keystop rail 1 mm above black key damper lift: damper should start to rise when hammer has traveled 1/2 distance to string damper pedal stop: dampers should stop at same height either by key or by pedal damper stop rail: 1 mm of damper head when lifted above position raised by black key with hard blow shift pedal: hammer should move an amount equal to the distance which separates the center lines of 2 adjoining strings of a 3-string unison [How one measures 0.1, 0.2, or 0.3 mm of lateral play in a key bushing, I don't know -- maybe with a dial micrometer indicator. Same with the rep. lever height above the jack -- you just learn it by feel, or by "winking" the jacks when the hammers are at rest. And the spec for the una corda pedal (shift pedal) is awfully scientific -- no consideration for voicing mentioned.] --David Nereson, RPT ----- Original Message ----- From: PianoTek4u at aol.com To: pianotech at ptg.org Sent: Monday, July 14, 2008 6:39 PM Subject: Yamaha CF Regulation specs Dear Colleagues: I seem to have misplaced my sheet on regulation specifications for a Yamaha CF. Anyone happen to have them handy? Many thanks in advance. Tony Bajada ------------------------------------------------------------------------------ Get the scoop on last night's hottest shows and the live music scene in your area - Check out TourTracker.com! -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080715/16d28efb/attachment.html
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