I have had that blade do the dance on 3/4" ply, you are right on the parallel fence issue. I use a over head dust control without a spliter, it would help. Jay's set up would be great. Not all of the Freude blades in a batch are the same. I use them all the time and noticed the difference.
Don
: I went home last night and tried to replicate the problem using some pine
: scrap but couldn't get it to screw up again. I have some nice knotty pine
: strips now The only thing that changed before this test was the fence
: (which indicates a possible fence-parallel-to-blade problem).

: Then I checked the blade/arbor/motor mount connections for tightness or
: wobble. They all seemed fine. I did try flexing the blade side to side
: with my finger, which it did. The blade is a 7.25" Freud Diable thin
: kerf blade (.050), so a little flex doesnt really surprise me. Given
: enough pressure, Im sure the blade could be flexed back and forth to the
: degree shown in the picture. (the 10" blades provided with the saw
: dont really flex much at all)

: Then I removed the blade to check for warping and its fine.

: Then I ripped a different WRC board of the same dimensions (17'x 6" x
: 5/4) into strips no problem.

: I also had ripped a bunch wood into strips before the problem occured without
: issue.

: The only thing that changed for certian was the fence, leading me to believe
: that it is either a fence-parallel-to-blade problem, or a heat problem.
: The blade does have fancy laser cut 'heat expansion slots' in it (to prevent
: warping, allegedly) and I dont rip very quickly or let the blade get
: bogged down much so I think I'm leaning to the fence problem. It stands to
: figure that the back of the board exiting the cut could push against the
: blade forcing it to flex (with thin blades) to one side, which then begins
: to correct back because of the spring of the blade, only to have the
: process repeat.
: I think Jays suggestion of using a piece of wood attached to the fence (as
: the fence), ending just beyond the blade, as well as a kerf splitter
: suggested by Glen and some others would eliminate the problem. A zero
: tolerance insert couldn't hurt either I'm sure.

: Tonight I think I'll purposefully set the fence a touch off to see if this
: replicates the problem.
: I'll post the results. Then I'm setting the saw up as advised.

: Thanks for all your advice!
: -Ted

: BTW the saw and blade are brand new, bought for this boat. For a change I got
: to explain to my wife how Im saving us money by spending it, instead of
: the other way around. hehe.