After having finished the original Hand in Hand Clock, I had some people suggesting I made a skeleton clock version of the hand in hand clock. I really liked this idea. The type of clock really lends itself to a skeleton version, and I am an engineer, I don't need minimalist clocks, I want to see gears and stuff. So here we are, a Skeleton version. The mechanism is no longer hidden behind covers and frames. The mechanism is now the centerpiece of the clock.
The previous clock was made start to finish in 6 days. That is not design, that is EVERYTHING. Design was done in 2 days or about 10 hours. While it worked, it was an assembly nightmare. Some holes were unreachable, some gears had no bearings and shafts could not be properly secured without a lot of glue. This time I took the time to make a clock that can actually be assembled without glue and without getting a depression. It is easier to assemble and it runs better.
Another great improvement is that this clock uses a DC gear motor instead of a stepper motor. A stepper is easier to control, but it had a relatively big power consumption. It also produced a massive amount of noise, ticking loudly (louder than a normal clock) about every second. The DC gear motor can only be heard in a completely quiet room, and even then it only is on for about 2 seconds every few minutes. An added benefit of the DC motor is that it is a lot smaller and uses a fraction of the power. The whole clock never gets above 0.5W and has shrunk considerably in size. The DC gear motor uses a tcrt5000 optical reflex sensor and an encoder printed to one of the gears to determine the position of the motor.