2020:Wheel of Fortune: Difference between revisions
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Continued experimentation, design, and CAD. Decided that the servo and sensor must be mounted to the side of the wheel since mounting over the wheel requires an arm that is too heavy. More measurements and calculations were made about the height of the frame and another possible gear ratio. | Continued experimentation, design, and CAD. Decided that the servo and sensor must be mounted to the side of the wheel since mounting over the wheel requires an arm that is too heavy. More measurements and calculations were made about the height of the frame and another possible gear ratio. | ||
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-1/18/20 | |||
Attendance: Alex L2 | |||
Redid JVN calculator for mechanism. Found that Neo 550s were overkill and that a 49:1 gear ratio is still optimal. CAD assemblies were started for various parts of the mechanism (spinner and frame) and framework is nearly complete. | |||
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Revision as of 18:56, 18 January 2020
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)
- Unless the color sensor is placed at the frame perimeter (results in wheel being further back), it must be actuated
- 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
- An L-shaped arm going over the wheel is impossible due to its weight
Decisions:
- Wheel will be mounted parallel to the ground
- Middle of wheels must be 2 ft. 8 1/8 in. from the ground (Top of frame will be 28.25 in. from the ground)
- 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
- Color sensor will be actuated over the compiance wheel
- A smaller gear ratio in the gearbox may be used with an encoder to reduce weight and kickback
Need to do:
- CAD brackets and mounting
- Determine how and where to mount color sensor
- Fabricate and assemble
- Finalize gearbox
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.
-1/14/20
Attendance: Alex L2, Owen P, Ishan R
Set deadlines for design (see 2020 Intergration). The wheel mechanism was weighed at 1.9 lb and an estimate of 3-3.5 lb for the entire system was made. A few parts were CADed (servo mounts) and the .h file is nearly complete.
-1/16/20
Attendance: Alex L2, Owen P
Continued experimentation, design, and CAD. Decided that the servo and sensor must be mounted to the side of the wheel since mounting over the wheel requires an arm that is too heavy. More measurements and calculations were made about the height of the frame and another possible gear ratio.
-1/18/20
Attendance: Alex L2
Redid JVN calculator for mechanism. Found that Neo 550s were overkill and that a 49:1 gear ratio is still optimal. CAD assemblies were started for various parts of the mechanism (spinner and frame) and framework is nearly complete.
