Today’s Agenda Short (really short!) mini lecture & prelab description so you’re ready for lab next week Midterm: – Split into 2 groups: – D102 and D103:

Slides:

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Presentation transcript:

Today’s Agenda Short (really short!) mini lecture & prelab description so you’re ready for lab next week Midterm: – Split into 2 groups: – D102 and D103: go to Room 3090 with Naghmi – D101, D104 and D105: stay here in 5280

Making Things Move Mini-Lecture: intro to 4Bar Lab SIAT = School for Interactive Arts and Technology Interact with a computer: buttons, touch Interact with the Physical World: mechanisms (& analog circuits)

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Slider-Crank: a simple linkage mechanism (simplest?) Function: Transform rotation (of input link) into translation (of output link) Video: atic/companion.websites/ /DataFiles/Chapter-One/Videos- Movies/Video-1-5-SliderCrank.mp4 atic/companion.websites/ /DataFiles/Chapter-One/Videos- Movies/Video-1-5-SliderCrank.mp4 Q: how far does slider move along x-axis? A: think about the “throw” distance in the crank in slide 5

Four Bar Linkage

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Grashof’s Criterion Grashoff's condition for 4-bar linkage: shortest link can rotate fully if… length of shortest + longest < length of other 2 Not all 4-bar configurations allow full rotation of crank!

Prelab (Week 7) Objective -- assist you to: Build understanding of mechanisms: how components of simple assemblies can interact in useful ways Preparation for the lab Pre-lab: Experiment with the 4-bar simulator at Create a linkage whose output (path traced by “blue dot”) is close to circular. This is likely to be a crank-crank mechanism (see lecture slides for definition). Submit a screen-capture of your linkage image should include parameter values (at the top) and the Grashof’s Law numbers (at the bottom). DUE: beginning of next lab (Today 25 Feb, Mon 29 Feb)