General Thread Milling Problems
Rattling, Vibrations Bad Surface Quality on Workpiece Undue Wear (relief surface) Broken Cutting Edges Tapered Thread Shape (gauge clamps after reaching a certain depth) Steps in the Thread (gauge clamps all of a sudden) Small Difference Between Go and No-Go Gauging Tapered Thread Shape (to be verified by measuring only, not by gauging!) Marks in the Run-In area

Thrilling Problems
Clogging of Chips During the Drilling Process Insufficient Coolant Flow