Cutting slots in delrin on table saw
Most (not all) dado sets run a bit smaller (you might use an 8" on a 10" saw)

You'll want to feed pretty fast to avoid melting.

This page suggests a sawing tooth speed of 1600-2600 feet per minute for Delrin (acetal homopolymer). That would require about a 2" diameter sawblade at 5000 RPM if my math is up to snuff. A 10" blade at 5000 RPM is 13,089 feet per minute. A 6" dado set (if you can find one to fit) is 7,853 FPM. 2" (which I've never seen in tablesaw blades, and most saws would not get above the table, I think) is 2,617 FPM.

You may want to find another method/tool.