OLD MAE 377 Final

OLD MAE 377 Final - MAE 377: Product Design in a CAD...

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MAE 377: Product Design in a CAD Environment Project Number 26: Weed Puller Design Evaluated by Dr. DiCorso Presented by: Edward P. De Mauro 29816509 9 December 2004 I
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Table of Contents Problem Identification…………………………………. Pg. III Design Analysis…………………………………………. Pg. IV Appendix………………………………………………… Pg. VI Cost Analysis…………………………………………. .... Pg. IX Hand Sketches…………………………………………. . Pg. X Drawings………………………………………………… Pg. XII II
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Problem Identification The task that was presented before me was to design a device that could be used by an elderly person for the removal of weeds. This device was to feature a certain degree of adjustability, while keeping in mind the reduced mobility of the person that would be using such a mechanism. The particulars of these design criteria were left up to myself as the engineer to determine through the evolution of my design. Thus said, it was necessary for myself to narrow down a list of other requirements that would need to be met in order to design this machine to function at a level that an elderly person could utilize with little to no physical exertion. To begin with, I first realized that I had to distil a proper definition of who an elderly person is. Since the task only stated that the device be used by an older person (as was put forward in design problem #26), I decided that this would include a range of people within a specified age bracket. As such, I determined that the lower bound would be optimally set at 65, whereas the upper bound would probably lie somewhere around 75. Thus said, I opted for a device whose functional premise was based on that of a clicking pen. There would be a button of such at the top end of the mechanism that would be compressed, sending a load, P into a set of springs that would release a claw and grab at a weed. In order to get a general idea of what type of spring I would require for this weed puller, I decided that a value of 2 lb f would not be too demanding on the carpal area of a person in my age bracket. Finally, I reasoned that there would be a slight difference in the amount of exertion
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OLD MAE 377 Final - MAE 377: Product Design in a CAD...

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