When cutting a 1/4" dadio, are you just using the two outside blades of the
set? (i.e. no chippers). If aso, what you describe is probably normal as the
outside blades likely don't have flat teeth, rather bevelled ones which
produces this effect, the same as if you cut a groove using a single
sawblade, you will often see "batman" like "ears" on both sides of the cut.
It weill probably be less noticeable when you cut wider dados using some of
the chippers too.

--
Regards,

Dean Bielanowski
Editor, OnlineToolReviews.com
http://www.onlinetoolreviews.com
Over 180+ woodworking product reviews online!
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"k" wrote in message
...
I recently purchased a set of General dado blades. When I cut a 1/4
inch dado the groove isn't exactly square. On the top edges it cuts
points deeper and the middle of the groove is flat. I tried it on 2
different table saws and I still have the same problem. I exchanged
them for another set and the same thing happens. Does anyone have any
advice?