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[waynew45@verizon.net]

Hi Steve, what causes the slapping of the wood on the table when cutting? I have a Dewalt 690 and have checked the blade angle to the table and it seems fine. I really have to apply a lot of pressure to keep the wood down on the table. I'm using #5  reverse blade and 1/4" walnut. Any help would be appreciated.

[dunk]

One reason can be the blade is in upside down.  You will find you do have to hold a piece down even when the blade is facing the proper way but it should not be difficult to do.

[Rapid Roger]

+1 for dunk's answer.... It has happened to all of us at one time or another. 
Also maybe you are using a too aggressive blade on thinner wood. the fewer TPI (teeth per inch) the more aggressive the blade is. A high tooth count is better on thinner stuff.
Speed of the blade inters into the whole thing too. Try speeding up or slowing down the blade speed and feed a  bit slower.
Sometimes even pushing the material to the side when cutting can cause the blade to catch and cause what I call "rattling" of the wood.
Hope some of those suggestions help you out.

Rog