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Siemens Film Path Tension Tester: Design Improvement for Medical Analysis

This project focuses on improving the design of the film path tension tester used in creating cuvettes for medical analysis to address customer complaints. The film is packaged in a canister assembly with brake spring mechanism. The tester aims to identify and rectify issues related to Dimension Instruments for better quality control. Testing includes control tests, wear test, brake spring test, and surface finish test. Metrics measured include time, size, safety, and film properties. The final prototype meets initial metrics and shows tension increases with smaller roll diameter. The tester will undergo further analysis by Siemens and quality control tests by Nypro. Isometric SolidWorks models are used for visualization. Acknowledgements to sponsor Jim Kegelmen, advisor Nate Cloud, and Senior Design Staff.

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Siemens Film Path Tension Tester: Design Improvement for Medical Analysis

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  1. Film Tension Tester John Ford, Peter Hauser, John Highberger, NebiyouGetinet Concept Generation Final Design Overview Design Overview Background Information Design Process Siemens has been receiving complaints having to do with film path within the Dimension Instrument Series. Siemens links this to a variation in tension of the film. The Product The film is used to create cuvettes used for medical analysis. This film is packaged in a canister (right) assembly that is held in place with a brake spring, and pulled out by a motor at the end of the cuvette path way. Design Overview Film Travels: Out of canister Over load cells Through motor driven rollers Film is Expelled from system Final prototype Close up of data display Testing Plan Project Scope • The additional testing Siemens desires include: • A series of control tests, • Accelerated wear test, • Variable brake spring test, • Surface finish test • This is to help determine causes of the errors in the dimension machine. • Testing for metrics include: • Time to perform test • Weighing and measuring size • Safety • Film Tested • Test meets our standard deviation requirements. Develop a better testing system that identifies the issues associated with the Dimension Instruments in order to reduce customer complaints and improve the quality control of the film canisters. Design for Film Path Metrics Final Prototype Validation • Following these test plans, most of the metrics initially set in place were met: • The time to operate is around 15 minutes • Film tested is around 750 feet • The size and weight is the same • The results from additional testing show that the tension increases as the diameter of the roll decreases. • The increased force from the stronger brake spring increases tension significantly. Path Forward The tester will be returned to Siemens for further analysis. After Siemens performs their series of test, the belt will be passed off to Nypro. The tester will be configured with a belt for accelerated wear. Nypro will perform quality control tests on the manufactured canister. This will help avoid canisters that don’t remain within the desired limits of 180 to 700 gram-force. Isometric SolidWorks Model Side View SolidWorks Model Acknowledgements *Additional steps may be required based on test. We would like to thank our sponsor, Jim Kegelmen, and our advisor Nate Cloud, and the rest of the Senior Design Staff.

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