2020:Wheel of Fortune
Team Lead: Alex L.
Prototyping 1/5/2020-1/11/2020
Overview: Based on initial team brainstorming and sketching, as well as the information from Strategy Subteam, we determined to prototype:
- A wheel(s) and a form of vision used to spin the control panel from the side.
Observations: We observed the following over the course of prototyping:
- Color sensor has limited range (3 13/16 in. maximum when parallel to surface)
- Wheel has a fair amount of kick-back, must be firmly and strongly mounted
- Wheel is still spun at an adequate speed despite loss in efficiency from gearbox
Decisions:
- Wheel will be mounted parallel to the ground
- Middle of wheels must be 2 ft. 8 1/8 in.
- Color sensor will be used for vision
- Two 4 in. compliance wheels (blue)
- 550 Motor for wheel
- 49:1 Gear ratio (provides WoF with a speed of ~51 RPM)
- Sensor must be actuated to keep wheel at frame perimeter
- The wheel will be facing up with the motor facing down
Need to do:
- CAD brackets and mounting
- Determine how and where to mount color sensor
- Fabricate and assemble
Design
- 1/11/20
Attendance: Alex L2, Owen P, Ishan R
The subteam formed. We started developing concepts and ideas for how to spin the control panel. Through calculations with RPM, wheel circumfrence, and real-estate on the robot it was decided to go with two 4 in. blue compliance wheels and a 550 motor with a 49:1 gear ratio to spin the panel. It is known that we will use the color sensor but not how or where we will mount it.
- 1/12/20
Attendance: Alex L2, Owen P, Ishan R
Assembled prototype of wheels on the 550 motor with a 49:1 gearbox. Experimented with different distances and angles with the color sensor and decided that the sensor will be actuated to fit with the current placement of the wheel (edge of wheel near edge of frame perimeter). Brainstormed various ways to mount motor and sensor to framing. Tested prototype on the plywood control paned and found that the wheel spins at the needed speed (>45 RPM) and makes adequate contact.
