26 May '15, 8am

Odd Clock Moves Minute Hand to Hour Hand

Odd Clock Moves Minute Hand to Hour Hand

We see a lot of clocks here on Hackaday. Some make it easy to tell the time, others are more cryptic. [dragonator] has done something that is so simple, we are surprised it isn’t more common. In a typical mechanical hand clock the minute and hour hands rotate around the same axis. [dragonator] decided to take the minute hand and move it out to the tip of the hour hand . It works because of a gear system hidden behind the thick hour hand. As the hour hand turns, the gear system rotates, the last gear of which is connected to the minute hand. Since the minute hand rotates 12 times for every one revolution of the hour hand, the gear ratio can easily be calculated. The 3D printed parts were designed by [dragonator] himself. All of the design files are available here for anyone who wants to build one of these neat clocks. The clock uses a Trinket microcontroller board to keep t...

Full article: http://hackaday.com/2015/05/26/odd-clock-moves-minute-han...

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