IF you find yourself without a dado blade, you can nibble your way to success anyway. The same technique works for tablesaws, circular saws, radial arm saws and routers. What it all boils down to is you need to make a cut wider than the blade/bit that you have. Like any low buck approach, more work is involved and your results will vary. Obviously, safety is your most important objective. If it doesn't feel safe to you or you are not comfortable doing it, don't.
Several things to look at in this picture, two boards getting the same grooves, tape to help hold them in alignment and if you look close at the bottom of the cut, you can see the many passes of the blade to get this width.
As you can see in the wider view, it is just multiple passes with the blade to get the width I wanted. NOT the best way to do this but it works and can pull your cookies out of the fire.
Careful work can leave you with a nice tight joint like above or you wind up with one that is a bit on the sloppy side. There is very little room for error using this method.
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