I agree wholeheartedly with Brenda's suggestions, and might add you will find this may be one of the most discussed topics.
Which type of lower guard do you have?
In my case, I have the cast aluminum lower guard, with a 1.25" aluminum spacer permanently installed. I have experimented with sealing the spacer to the guard with duct tape to eliminate small cracks. My best improvement has been extending the right face, front and rear of the guard to the same height as the left side of the guard, and adding a piece of 1" thick foam on top of the guard between the table and the guard. Right now, that means a lot more blade is exposed than necessary for cutting thinner stock, but I hope to remedy that by adding and stacking more foam inserts, or making inserts out of a variety of thicknesses of foam. A zero clearance insert also helped me. Most of the dust that does escape is usually from the top side of the table, and that is a relatively small amount. The attached pictures show the amount of dust that was not collected after ripping approximately 60 LF of 4/4 oak. I use a DC3300 dust collector. This approach works well when the table is not tilted, and I have not tried to improve dust collection for when the table is tilted, as I seldom make those types of cuts.
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Last edited by br549 on Fri Sep 13, 2019 11:27 am, edited 1 time in total.