Balance Rail Felt Punching Theory

[David Ilvedson]

If the piano is designed well, you should be able to use thin balance rail
punchings to get correct key height.  As you remark to compression, I would
always use a thin cloth punching and thicker card punchings to raise key
height.

David I.

> -----Original Message-----
> From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf
> Of Farrell
> Sent: Thursday, November 16, 2000 8:00 AM
> To: pianotech@ptg.org
> Subject: Balance Rail Felt Punching Theory
>
>
> Hi List. I have been victim to "Balance Rail Felt Punching Compression"
> disease. Why are there 5 thicknesses available? Seems to me the
> thicker ones
> will compress more over time, resulting in all the familiar problems of
> shallow dip and mid-keyboard trough. Why not just always use the
> thin felts
> and just use an appropriately thick cardboard punching to make up the
> difference when the original was a thicker felt punching? What are the
> advantages/disadvantages in doing this?
>
> Terry Farrell
> Piano Tuning & Service
> Tampa, Florida
> mfarrel2@tampabay.rr.com
>
>