I have used two methods to cut a slot in the middle of a piece of wood. The first is using the router table and bringing the piece down on the router bit. I have lines on the fence that show beginning and end of the slot.
The second is to use the drill press to drill two holes in the wood at the beginning and end of the slot and then use the router table to route the wood between the two holes.
What method do you use?
I usually do the first. Either will work. However, the latter requires proper alignment of the same cut on two machines. if that is important to the final product then it make it more difficult. In either case, I'm not sure what the advantage would be using the latter.
I prefer the second method. Drill press and router table. Drill press and fence to get through holes in the exact beginning and ending of the slot. Register the router bit with fence and 2 stop blocks. Raise bit to take multiple gradual passes until bit makes it to the top. I don't like lowering a piece of wood onto a spinning bit like the first method.
Through slots are almost always done on the TS with a FTG rip blade. Minimum wear and tear on the cutters, easy to center and adjust the slot width.
For stopped slots, single pieces, I'll drop down on the router bit (table) and do as you describe with start/stop marks on the fence or stop blocks clamped on.
If doing many pieces and if the final project would accept the slight grain discontinuity, I'll use the TS method first mentioned, then insert fill strips into the slot to cap off the ends of the cuts.
I made a slot jig for my compact router. It is made with a lip to catch the edge, it can be screwed or clamped down. It took some tweaking to get it to glide smoothly but was worth it and accurate (but tight).
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