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Geared Desk Clock

by kobaj, published

Geared Desk Clock by kobaj Jan 17, 2017

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Summary

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:

  1. Print all the parts.
  2. Glue together gear sets as specified in ascii_gearsets.txt
    • Note! Don't glue to the metal standoff or to the nylon washer.
  3. 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.
  4. 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.
  5. Screw the remaining gear sets to the plate.
  6. Push the feet into place.
  7. Attach power, and make the motor run at 3 revolutions per hour.
  8. Done!

Optional:

  1. Mount the reed switch so it is triggered by the magnet.
  2. Write code to adjust your motor speed when the reed switch is triggered.
  3. 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:

Helpful resources:

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.

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.

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Very cool thing! Congratulations!

Some useful information about how the gears work together (motor mounted gear drives m (minute) gear,
m gear drives set 1, set 1 drives set 2, etc, and set 5 drives h (hour) gear. Gears in sets are rearranged
to show the clock face as unobstructed as possible and spacers are printed as thick as gears in the center.
(Btw, the parts list seems to miss the 15 teeth gear, which has to be printed only once.)

.-------------------------------------------------------------------------------------------------------.
| - upper V: driven by ## Teeth                                   stepper motor drives with 12 T m gear |
| - lower V: drives with ## Teeth                                                            V          |
| - 12 hours: 12x36/20*10/20*10/18*12/15*10/18*12 = 32 x 1 (requires 12x36/12 turns of      +=+  12     |
|                m  Set1  Set2  Set3  Set4  Set5    h                                       | |   V     |
|             (12) rounds of 36-T-minute-hand make 32-T-hour-hand round once (1), and takes | |  +=+    |
|             12x36/12 = (36) rounds of 12-T-stepper-motor-driven wheel. This and motor gear| |  | |    |
|                        reatio are used in software to calculate # of steps per time unit: | |  | |    |
|      driven by         28BYJ-48 motor ratio 1:64 requires 36*64=2304 steps in 12h (43200s)| |  | |    |
|      36 T m gear  10   ... (cont.)                                                        | |  | |    |
|       V           V                         18                      18                    | |  | |    |
|      +=+         +=+                         V                       V                    | |  | |    |
|      | |         | |                        +-+         12          +=+                   | |  | |    |
|      | |         | |                        | |          V          | |                   | |  | |    |
|      | |         | |                        | |         |-|         | |                   | |  | |    |
|      | |         | |                   +=+  | |         | |         | |       +=+         | |  | |    |
| +=+  | |         | |       +=+         | |  | |    +=+  | |         | |       | |         | |  | |    |
| | |  | |         | |       | |         | |  | |    | |  | |         | |       | |         | |  | |    |
| | |  | |         | |       | |         | |  | |    | |  | |         | |       | |         | |  | |    |
| | |+ | |+ +--+   | |+ +--+ | |+   +--+ | |+ | |+   | }+ | |+ +--+   | |+ +--+ | |+   +--+ | |+ | |+   |
| |10| |20| |S |   |20| |S | |10|   |S | |12| |18|   |10| |15| |S |   |18| |S | |12|   |S | |36| |32|   |
| |T | |T | |P |   |T | |P | |T |   |P | |T | |T |   |T | |T | |P |   |T | |P | |T |   |P | |T | |T |   |
| | |+ | |+ +--+   | |+ +--+ | |+   +--+ | |+ | |+   | |+ | |+ +--+   | ++ +--+ | |+   +--+ | |+ | |+   |
| | |  | |         | |       | |         | |  | |    | |  | |         | |       | |         | |  | |    |
| | |  | |         | |       | |         | |  | |    | |  | |         | |       | |         | |  | |    |
| +=+  | |         | |       +=+         | |  | |    +=+  | |         | |       | |         | |  | |    |
| 10   | |         | |       10          +=+  | |    10   | |         | |       +=+         | |  | |    |
|  V   | |         | |        V          12   | |     V   |_|         | |       12          | |  | |    |
|      | |         | |                    V   | |                     | |        V          | |  | |    |
|      | |         | |                        +=+                     +=+       drives      | |  | |    |
|      +-+         +=+                                                          32 T h gear | |  | |    |
|                                                                                           | |  | |    |
| - 1 x 12 T stepper motor driver    ... (cont.)                                            | |  | |    |
| - 3 x 10 T                         = 1 step per 18.75s; 18.75s / 8 = 2.34375s             | |  | |    |
| - 2 x 12 T                         = 2343.75milliseconds per half-phase (4-phase motor    | |  | |    |
| - 1 x 15 T                           requires 8-half-phases for reliable execution of     | |  | |    |
| - 2 x 18 T                           a full step.                                         | |  +=+    |
| - 2 x 20 T                         For extremely easy to program controller board(s) and  | |         |
| - 1 x 36 T minute clock face       software example to drive 28BYJ-48 motor see:          +=+         |
| - 1 x 32 T hour clock face         http://forum.espruino.com/comments/12055381/           36          |
| - 6 x SPacer                                                                               V          |
| +            +   +            +   +            +   +            +   +            +   +     m    h +   |
| +------------+   +------------+   +------------+   +------------+   +------------+   +------------+   |
|     Set 1            Set 2            Set 3            Set 4            Set 5          Clock Face     |
|     Glue             Glue             Glue             Glue             Glue           No Glue        |
'-------------------------------------------------------------------------------------------------------'

I used ABS... but had shrink issues with the plate. Considering to use 2 plates of Lexan, which also make
front and back of the casing.

Awesome rearrangement of the gears! Do you have a picture of how that looks?

Additionally, thanks for pointing out my missing 15 tooth gear, I'll get that updated.

Jun 2, 2017 - Modified Jun 2, 2017
allObjects - in reply to kobaj

not yet... so far have just the gears and understand how they work... was actually the second time I used my 3d printer after just get it assembled and printing some tries, like the famous boad with lego bottom and chimney and a dog for on of my grand kids. I still have to come up with the spacers that are as thick as the gears. Furthermore, the rearrangement of the gears may change the motor mounting as well, because the minute gear is not on bottom level anymore, but one level up. ...may be I'm ending up with a remix... my final goal is to use it (with a second motor) to build an oversized Swiss Railway Clock - as designed not only visually but behaviorally by Swiss Engineer Hans Hilfiker in 1944. The most unique part is that the second hand runs a round in about 58.5 seconds, stops for 1.5 second at top, and then the minut hand jumps to the next minute and at the same time the second hand begins a next round. This behavior was due to the then available technology which sent nation wide a pulse every minute by the master clock... the second hand was driven by a local independent, synchron motor of the power grid frequency (see https://en.wikipedia.org/wiki/Swiss_railway_clock). The software will be very simple due to the use of Espruino: a few lines of standard JavaScript.

Comments deleted.

do you have more pic, maybe side pic to show standoffs, are they suppose to go through the gear holes? also what are the 3 little pieces that printed with the plate for? thanks

The two J shaped pieces plug into the square holes on the back of the clock. They allow you to route wires around easily depending on your motor and circuit board and sensors used. This picture shows how I use it. http://imgur.com/1aDW8HN

The remaining piece printed with the plate is designed to hold a reed switch type sensor above a circuit board at just the right height to catch the magnet. All three pieces can be considered optional.

Here is a picture showing how the standoff sits inside the gears, spacers, and nylon washers. Hope it helps! http://imgur.com/o5HkSQs

sorry one more question, are the standoffs suppose to be glued or should they spin, mine are super tight, so maybe I need to reprint gears?

The gear stacks are only glued to themselves (Plastic to plastic). The gears should spin very freely against the standoff (Plastic to Metal). I used a small bit of sand paper and sanding file on the inside of my gears to get them smooth and just the right size.

thanks, the reed switch idea sounds cool, but too advanced for my programming skills, would not have a clue how to program that. Maybe in the future, thx

I wrote the code for this clock. The wiring is in the code.
It's in my remix here http://www.thingiverse.com/thing:2052963

Geared Clock Remix
by 3DMB
Top