Discussion

Set Screw Manufacturing Process:

(a) Drilling and reaming holes.

(b) Turning hexagonal or star holes.

(c) Precisely finishing the outer circumference.

(d) Precision threading of the outer diameter.

(e) Precise trimming of the spindle cutoff surface.

Critical Quality Checkss:

(1) Ensure the thread profile meets design specifications.

(2) Broaching hexagonal and star holes.

(3) Hexagonal and star holes must align concentrically with the thread.

(4) Hexagonal and star holes should have no burrs on the bottom.

(5) Maintain a smooth, defect-free end face, crucial for compatibility with the U head of the polyaxial screw during the manufacturing process.