I am still discovering little things that aren’t in the SawStop Floating Overarm Guard manual. Today’s lesson is that the suction from a strong dust collector through the guard can lift the insert plate. It lifts it as high as the locking mechanism allows it to travel. It lifts about an 1/8” which is enough to snag a workpiece being fed in. The easy fix is to start with the workpiece on top of the plate holding it down. Without the lock, I suppose the air flow could pull the plate out of the table. I did have air flow connected to the blade shroud below the table. Apparently, gaps between the shroud and the bottom of the table are large enough to reduce suction on the bottom of the plate to a negligible level.
Here is short video showing the lift. Turn sound on so you can hear the dust collector spinning up and then down.
https://www.youtube.com/shorts/YP89fAB-zm8
Also, the air flow can suck small cut-off pieces back toward the air hose at the rear of the guard. They can be pulled into the rear of the blade and flung forward with great force. I have had this happen twice. The first was when I was trimming a rough 8/4 oak board to width. The width varied such that at times the cut was less than a blade width and at times a thin sliver was cut off. One of these slivers was caught and thrown out the front of the guard and hit my hand. My hand was at least 6” in front of the guard and more than 11” from the blade. The impact was enough to draw blood and make me consider ways to be safer. One is to put my magnetic feather board in front of my hand to deflect any projectiles. Another is to sacrifice some dust collection and throttle back the flow by closing the blast gate a bit. A third is to use the bandsaw. My bandsaw has a small table and is not well set up for ripping long heavy stock.
The second incident was when I was cutting 1/16” x 3/4” strips into short pieces to use for checking blade projection on hand planes. One piece was sucked into the dust collector and another was throw forward violently but harmlessly into some dark corner of the shop. I switched to the bandsaw at that point.