Yamaha CFlll Question

[Roger Jolly]

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Hi Phil & Horace,
                              Assuming you have good sound board crown and 
correct bearing.

           Once the older CF111's start to get Capo bar grooves the sustain 
tends to drop quite a bit in this register.  Drop the tension on two notes 
so you can thread a strip of Emery cloth between the Capo and strings, shoe 
shine the capo bar to remove the grooves, pull back up to tension and check 
the sustain again. I think you will find an improvement.

Lift the strings so there is a lower amount of forward duplex bleed,  tap 
the bridge pins to make sure they are secure, and the strings are well 
seated.  This will improve sustain.

Make sure that all perimeter plate bolts are secure.   Hammer 
shape??????   Hammer fitting????  Glide bolts are critical on this piano 
for optimum sustain and power.

What is the hammer flange centre pinning Like? 4 gms of friction is 
optimum.  What is the let off and drop Like?

The new CF111 hammers are made from Wurzen Felt and will produce much 
better sustain.   A World of difference from the old style hammers.

Should give you some food for thought.

Regards Roger



At 01:10 AM 3/13/2005, you wrote:

>Hi, Phil,
>
>Assuming that you have already done the normal tapping of strings & etc. 
>type stuff - what do the strings sound like when plucked as opposed to 
>when struck by the hammer?  That is, how much sustain do you get one, 
>relative to the other.  If the sustain is consistent, good/bad/etc aside, 
>then the problem is quite probably the hammer(s)...at least in that section.
>
>Also assuming that these are stock CFIII hammers, they really do not like 
>much in the way of liquids; and respond much better to quality shaping and 
>judicious needlework to develop tone.  (The techniques are much more like 
>working on Bechstein or Bluthner than a North American 
>instrument.  Various folks have written about approaches.)  If, however, 
>they have been over needled across the crown (a growing problem), either 
>be pleased that you can pass this work back to someone else or try to sell 
>a new set of hammers.  Since you said "CFIII" and not "CFIIIs", this 
>sounds like an older instrument which might well be ready for a number of 
>things.
>
>I'd be interested in what you find with some further diagnostics.
>
>Best.
>
>Horace
>
>
>At 07:47 PM 3/12/2005, you wrote:
>>I am caring for one presently, and from G#5 to about D6 is noticeably 
>>lacking in sustain of any kind..almost like the damper is still on the 
>>strings. There is good tone, with no sustain.
>>
>>Is there something I can do for these few notes to blend them in better?
>>
>>The tech that normally has this piano in his possession does not like 
>>liquids..and I'm not sure this is really a hammer problem since there is 
>>good tone, but no sustain.
>>
>>Any ideas?
>>
>>Thanks,
>>-Phil Bondi(Fl)
>>
>>_______________________________________________
>>pianotech list info: https://www.moypiano.com/resources/#archives
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives

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