Geared Desk Clock

thingiverse

A neat-looking 3D printed gear clock for your desk! You'll need to print six spacers, three 10-tooth gears, two 20-tooth gears, two 18-tooth gears, two 12-tooth gears, one 15-tooth gear, and two feet. Additionally, you'll require one 36-tooth "minute hand" gear, one 32-tooth "hour hand" gear, one 12-tooth motor gear, one motor mount, and one plate. You will also need twelve nylon washers, eight M4 x 20mm bolts, eight M4 nuts, six M4 x 13mm round standoffs, a stepper motor (I recommend the 28BYJ-48 model), a stepper motor driving board, and optional small magnet and reed switch. Glue will also be required; I suggest using Super glue or a solvent-based glue like Weld-On 16. To assemble the clock, print all the parts first. Then, glue together gear sets as specified in ascii_gearsets.txt. Be sure not to glue any part to the metal standoff or nylon washer. Next, attach the motor using the motormount and its corresponding 12-tooth gear. Place a nylon washer between the gear and the plate. You can mount the motor from either the front or back of the clock - your preference. After that, screw the clock face to the plate as shown in the pictures. Make sure not to pinch any part between metal standoff and the plate. Now, screw the remaining gear sets to the plate, push the feet into place, attach power, and make the motor run at three revolutions per hour. Your clock is now done! If you want to add extra features, you can mount the reed switch so it triggers when a magnet passes by. Write code to adjust your motor speed when this happens, ensuring the reed switch is triggered once every twelve hours. Some tips: depending on your printer, you may need to size up or down the gears by one percent. Additionally, file the mounting holes for the gears to achieve frictionless rotation. Where to find necessary materials: * Nylon washers: http://www.mouser.com/ProductDetail/Keystone-Electronics/3138 * Standoffs: http://www.mouser.com/ProductDetail/RAF-Electronic-Hardware/M0542-4-SS/ * Motors: https://smile.amazon.com/dp/B01CP18J4A/ * Glue: https://smile.amazon.com/dp/B0149IFA9O * Magnets: https://www.kjmagnetics.com/proddetail.asp?prod=D41-N52 Useful resources: * Gear train generator: http://geargenerator.com * The gear train for this clock: http://bit.ly/2irquMW * Gear train calculator: http://scientific601.altervista.org/gear/gearcalc.html Frequently asked questions: Q: I see a circuit board and code in your pictures. Can I have their source? A: Not at this time, sorry. Q: What was this designed with? A: Autodesk Fusion 360. Print settings: Printer: MP Select Mini Rafts: No Supports: No Resolution: 0.20mm Infill: 70% Notes: Works great in PLA or PETG. Make sure the parts are flat and not warped after printing.