Balance rail felt

[Bob Hull]

Vladan,

You said you are going to let the felt sit without
compression for a few days and then measure again. 
However, if you compress the punching by some method
and then put in on the b. rail pin with the action on
top won't it stay compressed by having a key and
action stack weight sitting on it?  

Bob Hull

--- V T <pianovt@yahoo.com> wrote:

> Hello Bob,
> 
> I proceeded with some experiments:  I have all the
> Pianotek balance rail punchings, so I measured the
> compression on them for a given force (nothing
> elaborate - just a simple comparison).  Then I
> ironed
> them and measured again.  Interestingly, the
> thinnest
> punching (1mm) was not the low compression winner
> after ironing!  The 1.8 mm part was firmer after
> ironing.  I am letting them sit without compression
> to
> see how much they spring back.  I suspect that the
> 1.8
> mm part will be worse than the 1 mm part in a few
> days.  Just for reference, the 1 mm part would
> compress about 0.006" before ironing and 0.003"
> after
> ironing.  The 1.8 mm punching would compress 0.009"
> before ironing and 0.002" afterwards.  I expect that
> heat has a different effect from compressing on a
> threaded rod, so I will repeat that experiment with
> Ron's method.
> 
> I somewhat dislike the key leveling process and I
> don't make it easy on myself by refusing to use the
> split paper punchings.  I have observed key height
> variations of as much as 1 mm with humidity changes,
> so I am determined to do something about it.  Of
> course, the key height is also determined by the
> stability of the back rail cloth, so to do it right,
> I
> will have to find the combination of balance rail
> punchings and back rail cloth that tracks well with
> weather change.  I am equally concerned with the
> absorption of power in soft balance rail punchings.
> 
> Best regards,
> 
> Vladan
> ==============================================
> 


		
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