Is kickback preventable ?
http://search.yahoo.com/search;_ylt...ting+kickback+on+table+saw&rs=1&fr2=rs-bottom
There may be times where the use of a splitter/riving knife, push block, a properly set up saw and fence doesn't prevent it, but not in my experience when cutting panels or sheet goods. Mine have all occurred because of a lack of a splitter/riving knife on my saw or operator error on my part. However, they may also occur when ripping lumber, since it can move or curve into the fence after being cut.
There are certain circumstance where a
kickback can be expected:
1. Occasionally very thin rips may sit there along the fence and a rotating blade for a while and creep back slowly. A properly set up fence will not cause them to project rearward.
2. Sometimes a piece may "move" as it's being ripped and curve away from the fence and be projected rearward.

3. I've also had the loose piece from a 2 cut rabbet projected back at me ...no fault of the saw setup or operator (me) and I fully expected it :yes: and was prepared for it by standing far enough to the left of the blade. There is a "No Standing" area behind the saw where no one is allowed for this very reason. In a one man shop that's not as much of a concern as in a production shop or in a school setting where there are others present.
So, no not all kickbacks are preventable, but you will learn when to expect them and how to avoid them.