Geared Desk Clock by kobaj

Last crawled date: 3 years ago

A neat looking 3d printed gear clock for your desk!
You'll need to print:
6x spacers
3x 10 tooth gears
2x 20 tooth gears
2x 18 tooth gears
2x 12 tooth gears
1x 15 tooth gear
2x foot
1x 36 tooth "minute hand" gear
1x 32 tooth "hour hand" gear
1x 12 tooth motor gear
1x motor mount
1x plate
Additionally:
12x nylon washers
8x m4 20mm bolts
8x m4 nuts
6x m4 13mm standoffs round
1x stepper motor (I recommend model 28BYJ-48)
1x stepper motor driving board
(Optional) 1x small magnet
(Optional) 1x reed switch
glue (Super glue works, but I recommend a solvent based glue like "Weld-On 16")
Tools:
Screw Driver
Pliers
Small File
Assembly:
Print all the parts.
Glue together gear sets as specified in ascii_gearsets.txt
Note! Don't glue to the metal standoff or to the nylon washer.

Attach the motor using the motormount and its corresponding 12 tooth gear.
Note! Put a nylon washer between the gear and the plate.
Note! You can mount the motor from the front or from behind, pick your favorite.

Screw the clock face to the plate as shown in the pictures.
Note! Don't pinch the nylon washer between metal standoff and the plate.

Screw the remaining gear sets to the plate.
Push the feet into place.
Attach power, and make the motor run at 3 revolutions per hour.
Done!
Optional:
Mount the reed switch so it is triggered by the magnet.
Write code to adjust your motor speed when the reed switch is triggered.
Make sure reed switch is triggered once every 12 hours.
Tips:
Depending on your printer you may need to size up or down the gears by 1%.
Additionally you may want to file the mounting holes for the gears.
You want a nice frictionless rotation of all gears around the standoffs and with each other.
Where to get stuff:
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
Helpful 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
FAQ:
I see a circuit board and code in your pictures, can I have their source?

Not at this time, sorry.

What was this designed with?

Autodesk Fusion 360.