Theory of quasi-circular-arc gear’s shaping is discussed in this paper

and its common tooth-surface equation is developed. By the graphic spectrum analysis of the profiles in end section

especially by contrast with the normal circular-arc gear universally employed at present and ideal contrate circular-arc gear

its unique advantage of overcoming deviation sensitiveness is pointed out. This always occurred at the contact region of the normal circular-arc gear’s engaging. It’s work process isn’t difficult at all

since a hobbing cuter can work on gears with different helix angles.