Centering Boss (Flange Clamping)
Note
When you do not want the work-piece to rotate, make a flat surface on the ØD (B1) of the boss, and fix it using a set screw (G2).
When you do not want the work-piece to rotate, make a flat surface on the ØD (B1) of the boss, and fix it using a set screw (G2).