I also have Jessum Clear-Cut TS (Table Saw) Stock Guides mounted on my 520 fence and, while they are expensive, they are absolutely great and one of the best accessories I ever purchased for my 520. I can't recommend them enough. They not only push down on the table and into the fence, as RFGuy points out , but the rubber wheels only roll in one direction. With them properly adjusted, one would have to really try to cause a kickback and I doubt the conventional headstock would have enough oompf to overcome the stock guides and fling the work piece back at the operator. I'm not sure the PowerPro would, either.RFGuy wrote: ↑Tue Jan 09, 2024 6:34 am I now have the Jessem Clear-Cut Stock Guides on my 520 fence and it works for like 95% of the rips that I do without being in the way. It both pushes down and pulls the board into the fence due to the 5° angle on the rollers. I just have to get a push stick to start the board and go up and over the rollers with it, but it has worked well for me.
The biggest issue, as RFGuy points out, is maneuvering the push stick over, under, or around the Jessum roller on the infeed side. I will say that the guides control the stock so well that it is possible to stop pushing momentarily with the saw still running and reposition the push stick without adversely affecting the cut, even on stock that is prone to burning, On occasion, I have even left the saw running and moved to the back of the machine and pulled the stock (which is already some distance past the blade) through the rest of the way. I am not recommending anyone else try this if they aren't comfortable, but it works for me.
I have found the guides are also great for conical disc sanding. One of the issues when using the conical disc is that one has to tilt the table toward the disc that roughly 4 degree angle so that gravity wants to pull the work down onto the conical disc. It can be hard to control the stock by hand and keep it tight to the fence if the piece is narrow or if it is long. The Jessum guides keep the work piece tight to the fence during this operation, even with narrow or longer work pieces so that one only has to push the stock forward.