Hand in Hand Mechanical Pendulum Clock

thingiverse

I stumbled upon this hand-in-hand clock design http://www.instructables.com/id/Hand-In-Hand-Skeleton-Clock/, and it got me thinking about making a purely mechanical mechanism even more enjoyable. My model uses a 15-tooth, Graham-style escapement and a 480g drive weight that really packs a punch. The shafts are all 2mm except for the two bottom ones which have a thicker diameter of 3mm. The pendulum is made from a 6mm aluminum tube that can be adjusted up and down in its mount to get it just right. So far, it's been running smoothly without any issues, although accuracy could use some improvement. Despite working smoothly for now, the clock still needs some work to reach its full potential. To make it even better, I'd like to tackle these improvements: The sprag clutch system that serves as the drum is too stiff and requires some tweaking to get it just right. Resizing the wells in the inner drum might allow for 4mm delrin spheres, which should give me a noticeable boost in performance. The back frame needs some extra support to prevent it from toppling over or falling apart. Currently, I have to mount it to a board or hold it in place with my hand, as seen in the pictures. Part of the problem is that my 6x6x6 print limitation forces me to use jigsaw-style connections. To lock the main shaft in place more reliably than relying on shaft friction, I need to find a better solution. Right now, the minute hand tends to wobble and lose its accuracy. To fix this issue, I'm thinking of adding some counterweight covers that can replace the tacky-looking blue tape holding the coins in place. I also want to design a counterweighted minute hand that's longer than the hour hand/gear train. This would give me more precision and make the clock even more accurate. Additionally, I'd like to add a pulley to the weight to double the clock's run time and have it pull down the center instead of offset. Lastly, I need to find a way to upload videos of this thing in action so everyone can see how amazing it is! Most of the gears and the anchor are printed at two perimeters with zero percent infill, while all frame pieces and the drum assembly are printed at 30%. Update: I uploaded a DXF of the gears that I used, and you can adjust them to add more or less slop into the gear train based on how your printer performs.