Action Rail Hole Spacing

[Delwin D Fandrich]

> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On
> Behalf Of Jon Page
> Sent: April 19, 2004 8:54 AM
> To: pianotech@ptg.org
> Subject: Action Rail Hole Spacing
>
>
> Use a drafting divider to index on a center line.
>
> Measure overall action length and each section's width by measuring from
> the left edge of the first
> wippen to the left edge of the last wippen. Between sections, measure
> between the last and the first.
>
> Map it out in pencil, correct if needed.  If you have the original rail,
> and the screws won't come out;
> clamp the new rail alongside and with a small square index the new holes
> off the side of the old screws.
>
> ot really too complicated.
>
> Regards,
>
> Jon Page, piano technician
> Harwich Port, Cape Cod, Mass.
> mailto:jonpage@comcast.net
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

If you're implying that the spacing can be taken by measuring the centerline
width of the section and dividing by the number of unisons (minus one),
don't. Most, if not all, traditional upright pianos use greatly progressive
action center spreads. That is, the action center spacing at the bass end of
the section will be some wider than the action center spacing at the treble
end of the section. This is especially so through the bass and tenor
sections.

Del