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Multi Axis Switch Test Jig
(M.A.S.T.J.)` Sponsor: Andrew Greenberg (The TOVA Company) Academic Advisor: Robert Paxton Presenters: Isidro Arredondo-Molina and Kevin DeLeon Group Members: Chu Ly Ka So, Dawit Dechasa, Anthony Mastropietro, Jonah Smith
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What is TOVA? Used to assess attention problems (ADHD & TBI)
TOVA stands for Test Of Variables of Attention Results are compared to “Norms” (Since 1960) Test is designed to be boring 20 minutes in duration Based upon timed response to visual stimuli Reaction times are measured down to +/- 1ms
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How the TOVA Test Works PC & Screen (For Visual Cues)
Standalone Signal Processor (Timing) Switch (Signal)
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Reason for our project Challenge:
Inconsistent switch behavior (switch bouncing) Actuation style matters Switch orientation matters Solution: Control the test environment...
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Build a Multi-Axis Switch Test Jig!
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Design Process Product Design Specifications External Search
Internal Search Concept Evaluation/Selection Detail Design Prototype & Testing Documentation External Search Internal Search Concept Evaluation Detail Design Prototype & Testing Documentation
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Definition of requirements (PDS)
Tool-less design Fully automated testing (press a button & walk away) 2 axis of rotation. (180° in one axis and 360° in the other) Known or measurable force & velocity Manual control of orientation DAQ sample rate of 10 ksps Budget of $3000 (max), $1500 ideal Must be Linux compatible
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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External Search Industrial Grade Components Hobby Grade Components
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Internal Search Rotary Fixture Initial Design Concept
Linear Solenoid Fixture
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Prototype Concept Selection
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Detail Design (Round 1!)
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Prototyping & Testing
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Concept Evaluation & Modifications (Round 2!)
Rotary Fixture Modifications 2-Axis Fixture Concept Evaluation
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Concept Evaluation & Modifications (Round 2!)
Rotary Fixture Modifications 2-Axis Fixture Concept Evaluation
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Rotary Fixture Modifications
New Flywheel Added Bearing Weight Reduction Mounting Through Hole Added a Second Plunger Also Increased Clearance for Removing Cartridge
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Concept Evaluation & Modifications (Round 2!)
Rotary Fixture Modifications 2-Axis Fixture Concept Evaluation
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2-Axis Fixture Concept Evaluation
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2-Axis Fixture Concept Evaluation
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Detail Design (2-Axis Fixture)
Hobby Grade Servo Motors All Plates are COTS from Machined Shafts Potentiometers Used for Position Feedback
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Complete Assembly
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Prototype & Testing 3-11 Lbf
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Design Process Product Design Specifications External Search
Documentation Product Design Specifications External Search Internal Search Prototype & Testing Concept Evaluation Detail Design
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Documentation & PDS Verification
Tool-less design Fully automated testing (press a button & walk away) 2 axis of rotation. (180° & 360°) Known or measurable force & velocity Manual control of orientation DAQ sample rate of 10 ksps Budget of $3000 (max), $1500 ideal Must be Linux compatible
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Questions?
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