INCREASE IN	EFFECTS	HOW
	Screw Length	Critical Speed Column Load	Decreases Decreases
	Screw Diameter	Critical Speed Inertia Stiffness Spring Rate Load Capacity Column Load	Increases Increases Increases Increases Increases Increases
	Lead	Torque Input Load Capacity Positioning Accuracy Angular Velocity Ball Diameter	Increases Increases Decreases Decreases Increases
	Angular Velocity	Critical Speed	Decreases
	Mounting Rigidity	Critical Speed System Stiffness	Increases Increases
	Load	Life	Decreases
	Nut Length (7 1⁄ 2 Turn Max)	Load Capacity Stiffness	Increases Increases
	Number of Balls	System Stiffness Load Capacity	Increases Increases
	Preload	Positioning Accuracy System Stiffness Drag-Torque	Increases Increases Increases
	Ball Diameter	Life Stiffness Load Capacity	Increases Increases Increases