Graduate Thesis Or Dissertation
 

Computer assisted design of planar workholders

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9k41zh794

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  • There are many situations in which contact between two bodies is at a single point so there can be no tensile (force). This form of contact only provides a single degree of restraint, and is defined as a unidirectional point contact. The analysis of Reuleaux shows that four suitably placed frictionless point contacts are required to completely restrain an object in a plane. The objective of the thesis is to allow user-placement of three contacts and to find acceptable range for placement of the fourth. If the fourth contact is anywhere in the range, the four forces fulfill the requirement for total planar restraint, i.e. all translations and rotations in a plane are prevented. This project considers the directions and placement allowed for the fourth force but does not take into consideration the magnitudes or friction coefficients of any of the four forces. In this research a program named Planar Restraint Design Assistant (PRDA) was developed to analyze positions of the four restraint forces. A planar object is first specified by the user; the program accepts AutoCAD images for more complex objects. For three given restraint forces PRDA determines a range of the fourth force such that total restraint is achieved. In addition, PRDA allows the user to arrange three restraint forces until a desired range of the fourth restraint force is obtained. Results are shown in visual form with accompanying graphs for numerical interpretation. A program user's guide and a program learning guide are provided as shown in the report with illustrative examples. Program source code in QuickBASIC is included in the report.
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