Hi John,
In my experience, making a flat reference work surface large enough for a soundboard or big harpsichord is surprisingly difficult. And keeping it reference quality flat over time is also hard. Also, any manufacturer of straight edges will tell you in short order that steel rulers are not straight edges! Put one up against a reference straight edge and observe.
Andrew
On 31 January 2016 at 12:25:28, JOHN BRODSKY ([log in to unmask]) wrote:
How about laying the flat upper surface on a flat table and holding a straight steel ruler from thick to thick across the area to be thinned, and observing the gap below the ruler?
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
Note: opinions expressed on HPSCHD-L are those of the individual con-
tributors and not necessarily those of the list owners nor of the Uni-
versity of Iowa. For a brief summary of list commands, send mail to
[log in to unmask] saying HELP .
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::