Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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I have sometimes seen several sheets of burl where the edges apparently were not trimmed together. When trying for a book match, it might be best to use landmarks in the sheets (small holes, unique figure, ...) to stack the sheets aligned with each other, tape the bundle with masking tape, and then trim what will be the inside edges.
Some pattern shifting is also normal with sheets of veneer. Sometimes it is insignificant over four sheets, but sometimes there is enough shift to be slightly noticeable.
Say you have four consecutive sheets that you've numbered 1, 2, 3, and 4 on a common corner. If you assemble the four sheets into a double book match (clockwise or counterclockwise) 1-2-3-4, you have a common edge between sheets 1 and 2, between sheets 2 and 3, between sheets 3 and 4, and finally between sheets 4 and 1. The first three seams have a "jump" of one (1 and 2, et cetera) but the last seam has a "jump" of three (4 and 1). If there were a significant pattern shift between sheets, the matches might look slightly better if the sheets were layed out (clockwise or counterclockwise) 1-3-4-2. With this layout, the largest "jump" is 2 instead of 3.
Pattern shift rarely might be a problem with only four sheets in a double book match, but can be significant in a radial match of 16 or more sheets.
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