Stress Anaylsis Design Project

Spring 2012

Group 27: Carl Glazer, Derek Lessard, Daniel Mark

Mechanism:

Our mechanism works by supporting our servo motor below the middle of a square cross section truss structure that extends out from the rectangular cross section truss that is attached to our base. These truss structures are supported using vertical and horizontal supports along with diagonal cross bracing. Our lever arm is 11 inches long with 4.25 inches from the servo to the weight, and our counter weights on the other side.

Theoretical Math:

With a distance of 4 inches from our servo motor to the center of the weight and a theoretical maximum of 90 degrees of travel from -45 degrees to +45 degrees from the x axis, we can theoretically lift the weight 5.66 inches. The torque required to move the weight with our two .5 oz counter weights is 62.38 oz-in which is 87% of our theoretical maximum torque of 72 oz-in.

Features:

Our interesting features include using an L-beam frame as a clamping base to save weight, the addition of an L-beam diagonal support at our area of highest compressive stress, and our servo mounting cage that both fully supported our servo and reduced twisting and bending at the tip of our structure.