Stress Analysis 24– 262

Crane Design Project

Spring 2013

Seth Cordts, Will Lush, Matt Powell-Palm

Group 37

Our Design

The Pain Crane’s lifting mechanism consisted of three major parts: a loop system to catch the bolt on the side of the weight, a shaft attached to the servo to act as the main moving part lifting the weight, and a weight on the end of the shaft. The loop was made of a small folded piece of aluminum screwed into the shaft, designed to catch the bolt between the weight and the head to securely hold it while it was lifted, dropped, and lifted again. It was screwed in loosely, allowing it to rotate as the bolt rotated on the lifting weight. The servo, slung below the beam of the crane, was attached to the plastic shaft, which was turned on its side to maximize the area moment of inertia (I) and prevent bending. The servo was mounted to the shaft roughly at the middle, with the loop on the end closest to the weight being lifted, and the counterweight on the other side. The counterweight was designed to counteract some of the moment produced by the lifting of the weight, and reduce the load imposed on the servo.

Servo Motor

Lifting Lever Mount

(Lever not in picture)