Hi. I have to cut 4x8 sheets of beadboard with a fine toothed circular saw.
> If I'm not mistaken the blade rotates from below the sheet upward as I go
> forward (is this right?). Anyway, if I want a clean cut on the front of the
> beadboard should I cut with it up or down?
With a hand-held circular saw the general advice is to have the good side down (your understanding of the mechanics is right on); with table saws you'd have the good side up.