Design of Rotary Knob Assembly

Abstract

Hand-related apparatus needs ergonomic designs failing which may leads to hand-related musculoskeletal disorders. There have been several studies on hand-related apparatus like gearshift knobs, door knobs, gas valve knobs, butterfly nuts and screw knobs are common knobs used for daily living activities. Other knobs like the convex, knurled, spherical, cone-shaped and ridged knob are often used for industrial-related applications. The ergonomics considerations identified in knobs include aesthetic look, position, torque requirement and shape-coding. The main function of this Rotary knob is to control the blower speed of Air Conditioner (AC) in a car. So without this part AC is stuck with same settings all the time because there is no other means to change settings. To operate this component often it must be made of durable materials to keep it away from deteriorating quickly. The aim of this project is to design a Rotary knob with its detailed components and assembling the knob on to encoder according to the specifications given in encoder drawing using CATIA and also to check all the possible interferences in between the parts to prevent clashes.