Chines and multi-piece rims

[Farrell]

The top and bottom of a case should be planar (assuming it was designed that way - I think pretty much all are). If the top or bottom do not lie in a single respective plane, then the case is twisted (although if the top shows twist, then the bottom should also). I find that the best way to see twist is to have a distant unobstructed view of the case from many angles. Sight with one eye with the eye in the same plane as the top of the case. If you raise your eye just a tad (like maybe a half-inch or less) and then lower it back to the plane of the rim top the rim should appear to be one line. Let's say you are looking at the piano from the side. Maybe the whole bent tail will clearly be in a plane, but when holding the eye at the same level, you can see that the treble side at the front is a hair lower than the bass side at the front. If you just stare and concentrate and move you head about just a bit you can see very small deviations from a planar case top (or bottom). This is real easy on square grands with their four flat sides.

Terry Farrell
  
----- Original Message ----- 
From: <Erwinspiano@AOL.COM>
To: <pianotech@ptg.org>
Sent: Sunday, March 03, 2002 10:56 AM
Subject: Re: Chines and multi-piece rims


> 
>         I've wondered at how one determines a case is twisted in the first 
> place let alone straighten it. 

snip
>     >>>best-----Dale>>>>>>>>>.
>