Toller wrote:
A few months ago I was building a router table and asked about putting a
miter slot into it to use with a sled.
Several people said they just ran the sled against the fence and found it
worked out well. It made sense, so I went that way.

The table is fine, but now I am making the sled and am not sure it still
makes sense. On some cuts (say a tongue and groove frame) won't the router
bit hit the sled? I suppose you could put a spacer between the sled and
workpiece, so the router bit is too high to hit the sled, but that seems
like it would ask for inaccuracies.

Am I missing something here?

If I read the question correctly, you are using the router table sled
like you would a table saw sled, i.e. you are placing the work piece on
top of the sled surface. As I have seen router table sleds, they are
more like push blocks (or miter guages) in that the work piece stays on
the router table surface and sits in front of the sled and the sled
pushes it past the router bit. The sled does get pushed into the bit
and acts as a backer board. Either build the sled with a disposable
piece at the front corner or, as someone else said, simply cut that
part off the sled after each session.

Dave Hall