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TOP TEN VINYL RECORD MYTHS
http://www.recordpressing.com/2010/03/top-ten-vinyl-record-myths-2/
MYTH # 1
You can cut deeper grooves in a 180 gram record than in a thinner record
False.
A record press can only produce grooves that are as deep as the cuts in the lacquer master. This depth is far shallower than any record thickness. Consequently, the thickness or thinness of the record has no impact on the depth of the grooves. Considering this, there has yet to be a record made where the two sides of the grooves meet in the middle meaning a thicker record is not necessarily advantageous. However, some artists, producers and consumers prefer the benefits of a thicker record which include reduced warp, less breakage, longer lasting quality, and that the weight of the records make them nicer to hold.