---------------------- multipart/alternative attachment On 5-sep-04, at 22:33, Richard Brekne wrote: > Hi folks YO! > > Ran into a new one for me. Fairly new Yamaha C6.. due for its first=20= > main service... overdue really but somebody has to pay for this=20 > stuff... Anways... started off with checking key height... 64 mm ok...=20= > made sure of the bedding... ok... set blow to 47... 1 mm deeper then=20= > spec but I find this usually leaves about the right amount of=20 > aftertouch.... ok... Did the letoff... 3 mm bass, tenor started at=20 > 2.5 and tapered to just under 2 at the top... ... > > Started noticing something wasnt really quite right....lots and lots=20= > of after touch... .. Checked key dip and it was SHALLOW for most of=20 > the bass, and just a bit deep from about middle C upward... > > So I double checked everything I'd done so far.... and decided to go=20= > ahead with 10 mm key dip and see where things took me. > > Anyways... I got done with the whole routine and found I still had too=20= > much letoff.... big bump. So I started to increase blow to 48 and=20 > found I couldnt get any deeper. The shank cushion stopped the hammers=20= > at 48 - 49 mm ! > > So... in the end.. I had 48+ mm blow, standard Yamaha spec letoff and=20= > drop, 10 mm dip, 64 mm key height and too much aftertouch with no=20 > real way of getting less. Ok.. I could have fudged a bit on let=20 > off... but a few tests didnt really get me where I wanted... I would=20= > have had to go with about 2 mm in the bass... 1 mm in the treble, and=20= > a 9.5 key dip to get the aftertouch down to where I usually like it...=20= > which is by no means too little. > > Anyone got an idea as to what could be wrong here ?? > > Cheer > RicB > There is nothing wrong oh great Brekne.... Do the following (and not too much please) : First check the distance(s) between the center pin of the hammer flange=20= and the wippen flange. This distance should be 112,5 mm. For reverence,=20= look at page 147 in your Yamaha "Basic Piano Technology" book. As was taught to you, make doubly sure that your key height is 64 mm=20 and that the frame is ok if you know what I mean. Set your key dip at 10 mm exactly (you by now should know exactly how=20 persistent our Nippon friends are about a key dip of 10 mm sharp,=20 remember?) Make a let off in the bass of 2 mm and in the whole treble of 1,5 mm=20 (and be very exact about this, making an exact let off is not easy at=20 your age hehehehehe). This let off is not even a concert let off, so be double sure that 2 mm=20= is 2 mm and 1,5 mm is 1,5 mm. This configuration should give you a healthy striking distance of=20 around 47 mm. Again, in your Yamaha "Basic Piano Technology" book it=20 says : 48 mm + 0 mm or - 2 mm, so 47 mm is a temporary 'so so=20 distance'. After having done all that, first finish the 'basic' regulation. You=20 perfectly know how to do that. When you're done with this, make your after touch and re-do your=20 striking distance the way I showed this in your lovely town. It might very well be possible that this C6 is one of those 'monsters',=20= by which I mean to say that you have a 'lucky action'. If that is the=20= case, you may have a perfect 10 mm key dip and a huge striking=20 distance, meaning that this C6 is capable of becoming a kind of=20 'concert animal' in regard to tonal / dynamical output. oh, and indeed, if the hammer cushions are too high, take your voicing=20= tool, stick da needles 2 mm inside the cushion 2 from the top, and with=20= a pliers rip off the 2 mm cushion felt. That will give you ample space=20= for your hammer blow. Have fun............ Andr=E9 Oorebeek ---------------------- multipart/alternative attachment A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 3627 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/53/39/b3/65/attachment.bin ---------------------- multipart/alternative attachment--
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