Leadscrew
Cast iron : 1800–2500 : 8 fpm Bronze : 800–1400 : 20–40 fpm Cast iron : 600–1000 : 20–40 fpm Bronze : 150–240 : 50 fpm The running speed for a leadscrew (or ball screw) is typically limited to, at most, 80% of the calculated critical speed. The critical speed is the speed that excites the natural frequency of the screw. For a steel leadscrew or steel ballscrew, the critical speed ...