Matt was inspired to create
a clock that defies the convention where the hands on every clock, no
how abstract the face, always move in a perfect circle. The minute hand
clock follows an irregular path as it completes its hour-long cycle.
minute hand is attached to the bicycle chain, which follows an
created by the randomly placed cogs of varying size. Through the clever
a low RPM motor and gear ratios, the minute hand makes one complete
every hour. The hour hand of this clock is the cog in the middle which
minute hand advances every time it passes. The hour hand has 24 teeth,
every hour of the day.
Due to the irregular shape of this clock, the minute hand can be pointing in one direction and five minutes later, seem to be pointing in the same direction. Along some parts of the clock the minute hand moves relatively quickly, while in other areas the minute hand seems to barely move at all. The combination of these two effects makes for a visually unique clock.
The project took a little over a year. As you can see in the images below, the general shape of the clock remained the same for the duration of the project while the orientation and the back board changed. The picture below shows the initial layout before the back board was shaped.
of the cogs are mounted on aluminum hubs Matt machined himself. In the
image you can see the addition of the gear reduction and the initial
flimsy and broke. Matt remounted the cogs onto to a more stable
are detailed images of the gear reduction and spring tensioner: