16. Applications and Implications¶
As the final project, I chose the watch project.
Clock gear system should be made from 10 mm and 18 mm plywood cut by CNC.
The gear system should be set in motion by the Stepper motor.
What will he do?¶
The clock will consist of a system of gears that will be driven by a stepper motor. The control board will be programmed in such a way that the stepper motor will make one full revolution in 1 second. The transfer of rotation will be decreasing, which will allow creating hour, minute and two second hands on different axes. The watch will have 4 dials: one for the hour hand, one for the minute hand, and two for the second hand. For the correct display of time, since the second hand will rotate in the opposite direction compared to the hour hand. An additional gear will be applied to change the direction of rotation. As a result, two axes will be used.
When the minute hand reaches full rotation, music will be played.
Interesting work done by others¶
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There is a very interesting project of creating clocks using gears made with a laser cutter. It can be found on YouTube on the GORDEEN channel.
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An original project of creating clocks has been accomplished by a student of Fab Academy in 2019, Viraj Gandhi.
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An incredible work of creating clocks has been accomplished by Anooj Jacob, a student of Fab Academy in 2020. The clocks are interactive and can be adjusted to different time zones if desired.
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An extremely interesting mechanical model of the solar system with the Sun, Earth, and Moon has been created using a gear system by Megumi Iwata, a student of Fab Academy in 2018.
What will you design?¶
- Gear system and watch case
- Clock faces and hands
- The design of the board for landing the stepper driver, for landing DFPlayer mini and the board for the operation of the Hall sensor.
- Clock legs
- Stand design for Hall sensor and speaker.
Fabrication of required parts and systems¶
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Watch case and gears: cutting on CNC milling, further processing with sandpaper.
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Dial and hands - cutting on a laser cutter
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PCB for landing a stepper driver with a voltage regulator of 5 volts to supply current to other boards - fabrication on CNC milling and further soldering of components
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PCB for landing DFPlayer Mini - fabrication on CNC milling and further soldering of components
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The Hall sensor board - manufactured using CNC milling with subsequent component soldering.
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Legs for watches - production on a plasma cutter
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Parts for landing the Hall sensor, for landing the speaker, for landing PCBs - printing on a 3D printer
Additional tools¶
- Electric table sander
- Grinder tool
- Drill
- Soldering iron
Required materials and accessories¶
| Qty | Description | Price | Link | Origin |
|---|---|---|---|---|
| 0.15 sq m | Plywood 18 mm thick | 2.60 $ | - | our lab |
| 3 sq m | Plywood 10 mm thick | 27.50 $ | - | our lab |
| d 0.46 sq m | Plywood 3 mm thick | 1.61 $ | - | our lab |
| 1 | DRV8825 stepper motor driver | 20.77 $ | aliexpress.ru | our lab |
| 1 | DRV8825 stepper motor driver | 3.40 $ | list.am | our lab |
| 1 | DFPlayer Mini | 2.60 $ | list.am | our lab |
| 1 | ATSAMD11D14A-SSUT | 1.80 $ | digikey.com | our lab |
| 1 | Copper Clad Laminate PCB 7x10cm | 0.90 $ | aliexpress.ru | our lab |
| 18 | Flange Ball Bearings - 8x22x7mm | 7.29 $ | aliexpress.ru | our lab |
| 1000 mm | Stainless Steel Rod - 8 mm | 28.91 $ | aliexpress.ru | our lab |
| 0.36 sq m | steel sheet 2mm | 6.70 $ | - | Ashot’s factory |
| - | other materials | ~ 10.00 $ | - | our lab |
| Total | ~ 115.00 $ |
What questions need to be answered?¶
- How to ensure uninterrupted transmission of rotation?
- What power supply should I use?
- How to find out the location of the arrows?
- How to program the system to work correctly?
How will it be evaluated?¶
- The main achievement will be the non-stop movement of the system.
- Turn on music when round hour is reached.