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Next Meeting: Saturday May 23, 2020 9:00PM - 10:15PM EST
Attendance:
Lance Bantoto (3B Tron)
David Choi (2A Mech)
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Wolfgang Windholtz (2A ECE) (note taker)
Subtasks:
Alaina Hansen - Attach belt to elevator
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Wolfgang Windholtz - Motors
Action Items:
- Torque/speed calculations, gearbox reduction ratios for the 2 motors - Asha
- Lance, Emily, Wolfgang set up meeting to pick motors
Meeting Minutes:
- Introduction of science task by Asha
- Soil sights
- Soul retrieval and tests
- Showed cad of current mechanism and explained it
- Shovel to retrieve soil sample
- Drops dirt in 6 different test tubes
- Spins test tubes
- Geneva drive to turn centrifuge accurately
- Motor that drives the shovel is cantilevered
- Motor for elevator does not have an encoder
- One encoder for indexing mechanism/motor
- Servos all have encoders
- Shovel has 2 limit switches instead of encoder, one on top one on bottom
- Two limit switches on the bottom for centrifuge rotation
- Error in initial design
- A piece of metal can't go through another piece of metal
- Difficulty assembly due to attaching the belt on to the frame
- Discussed errors and what parts worked well
- Worked well
- Geneva
- Difficulties
- Lifting sealing mechanism
- Reduce moment arm
- Discussed solutions and project allocation
Science mechanism improvements:
- Hooks for lifting seal cause binding because they only lift from one side
- Moment created
- Elevator currently doesn’t go down all the way (due to CAD oversight)
- Sealing mechanism not tested rigorously enough
- Shovel being redesigned to be two claws (David Choi)
- How many motors?
- Indexing limit switches are kinda sketchy (but may be due to print quality)
- Elevator limit switches don’t always contact properly
- Elevator CF spring might not be necessary?
- Chain tensioning needs to be fixed
- Probably want to switch 12V motors to 24V and/or brushless