(1) The clamping reference surface of the workpiece shall be clean and free of burr. For the workpiece after heat treatment, the slag and oxide film surface of the heat treatment fluid shall be clear at the step of the threading hole or the reaming of the concave die.

(2) Fixture accuracy should be high, and the workpiece should be fixed on the fixture or worktable with at least two sides.

(3) The position of clamping workpiece shall be conducive to the alignment of workpiece and meet the needs of processing stroke. When the worktable moves, it shall not collide with the wire frame.

(4) The force for clamping the workpiece shall be uniform, and the workpiece shall not be deformed or warped.

(5) When batch parts processing, it is best to use special fixture to improve efficiency.

(6) Small, precise and thin workpieces should be fixed on the auxiliary worktable or the auxiliary fixture which is not easy to deform.