Step 3: Connect the cogs.

Picture of Connect the cogs.
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This was trial and error. I went to a local clock repair shop and got cogs that geared up from 1 to around 4. This gave me a 90 degree turn on the servo equal to roughly 360 turn on the final cog.

To test the positioning of the cogs before I started putting them into the final box I put nails through them and tried them out on some scrap wood.

To begin with I drilled a hole in the lid of the box big enough to fit the shaft of the servo and screwed the servo to the inside of the case. On the outside I then screwed and glued the main drive cog directly into/onto the shaft of the servo.

All other cog are free to rotate around simple screws.

The final cog has an hour hand from a clock glued to the top of it. This allows the cog and hand to move together freely around the final screw.
tilmen4 years ago
Now, I'm trying to make DIY gears at home
tilmen4 years ago
cool. I did the same.working nice and fine to watch.