When designing gears is the number of teeth better at even or odd?

We are developing a tool to make (basically) corrugated strips... I've researched Link (http://www.eng-tips.com/viewthread.cfm?qid=247494) I like even numbers both for aesthetics and mathematics but am curious for an actual reasoning. Odd's and primary numbers(odds again , except for 2) seem to have merit for resonance and harmonics (which do NOT apply). Just curious what anyone thinks.

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Dick, in terms of gear making I'd say an odd or better a primary toothed gear is important in terms of wear and harmonics (more so at high speed) but for in the case of forming a corrugated strip
Let your artsy side shine threw and go with the even teeth

 
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