Back in the handsaw days, if a carpenter or woodworker needed a joint to fit together perfectly, he would recut the joint with the two parts put together. That made it so that the cut would be mirrored on both pieces, so they would line up accurately after the cut was made.
This simple sled does that on the table saw, holding two parts firmly in place for the cut. I also made 45 degree fences that are removable to cut perfect 90 degree miters.
I designed this on the fly and made improvements / additions as I went. Another fence option would be one for 22.5 degree cuts for a 45 degree miter.
Also this sled can work as a tapering jig, as I show with my first cut. And of course as a regular table saw sled for making 90 degree cuts on the ends of stock.
The base of mine is 16" wide and 22" long, so fairly compact. It can be made wider and longer, if needed, but I think this is a good general use size.

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