[pianotech] plate lags, (was persistent customer)

[Isaac Sadigursky]

HI,GEOFF!!!!   THANX FOR A KIND WORD....
   regarding Kawai qstn:
1]Kawai has qstnble structure of pinblock wood....
2]qstnble drilling of the pinblock technic//
3]/qstnble steel qllty for tuning pin,it flexes too much...
all this contributes to difficulties to tune,to stabilize Kawaiis....I  
stopped reccomending them to my clients for purchase,sorry to  
say......I had to walk-away from a few,sorry to say,too.....but this  
is not a discussion for the List,too many private parties,potencial  
buyers are lurking through the List..  Hope,it helps.....isaac
On Dec 29, 2008, at 10:08 PM, Geoff Sykes wrote:

> It's so easy to get into arguments on the list.
>
> Screws imbedded into metal rarely need tightening unless they are  
> subject to
> vibration. And even then the phenomena is rare. That's because metal  
> changes
> very little with changes in temperature or humidity. Wood, on the  
> other
> hand, can change quite dramatically with changes in temperature and
> humidity. Why do you think a piano can go out of tune simply by  
> turning on
> some stage lights? What I'm referring to is changes in humidity that  
> cause
> wood to swell and shrink. Over time, things like screws, nails etc.,  
> will be
> effectively squeezed out. They get loose. They need to be tightened.  
> As was
> mentioned in an earlier post, if you tighten these screws several  
> times a
> year you do stand the chance of over tightening them and damaging  
> the wood.
> All I'm saying is that checking them every once in a while will  
> likely keep
> them tight enough to maintain a stable plate and subsequently a stable
> tuning. Any more than that is overkill, and possibly not a good  
> thing. And
> as always, the key here is ymmv.
>
> -- G
>
>
> • Geoff Sykes, RPT
> • 626-799-7545
> • www.ivories52.com
>
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]  
> On Behalf
> Of Ron Nossaman
> Sent: Monday, December 29, 2008 9:19 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] plate lags, (was persistent customer)
>
>
>
>> Geoff Sykes wrote:
>>> Keeping them tight all the time is not so important as making sure
>>> that they are tight enough over the long haul.
>>>
>>> -- G
>>
>> Why?
>>
>> Ron N
>
> Ok, more to the point, by what mechanism would they get looser
> than "tightenable", and why isn't the criticality of
> tightening plate screws obvious in tuning stability unless it
> isn't in fact critical?
>
> Ron N
>
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