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May I suggest that burrs will be minimised if you cut on the flank with the compound slide set to the thread angle?John
Cut the lead screw first, and before cutting the lead screw, also make the blank for the tap at the same time. IE the final tap. You can measure the thread diameter with wires etc, unless you are buying acme 20tpi threading inserts that are the full form. You can keep threading until you get to the measured OD.Making series taps, so ones that are the same but just smaller on the over all dimensions help to get a really nice neat thread form as well.After heat treatment the tap will be ever so slightly larger in diameter, and will make a really neat nut to lead screw. On the leadscrew, just deburr and put a small corner break on the outer edges of the thread form. But not on the tap. Leave the tap outer edges sharp.Neil