Chain Clock

thingiverse

Because some people are having trouble, here is a warning: The chain has very tight tolerances, so test with a few pieces before printing the whole chain. The Rollers need to roll smoothly on the pins and the Outer Plate also needs to glide over the pins without much friction. This clock is a fully functional timepiece that shows approximately the correct time by rotating a roller chain twice per day. It works with a basic clock mechanism. The chain is 26 cm long. Additional hardware needed: * 2x M3 screws, 6-10mm * 1x clock mechanism, the shaft needs to be 20mm in total length. This is the one I bought: https://amazon.de/gp/product/B01LXWJFPW * 1x Bearing: 10x15x4mm https://www.amazon.com/gp/product/B00RWGXNVI/ Printing: Print the following parts: * 1x Enclosure, no supports, the keyhole in the top has a one-layer bridge built in * 2x Sprocket, the only part that needs supports * 1x Holder * 1x Pin * 1x Lid * 1x Big_gear * 1x Small_Gear Chain: * All the number links 1-12 * 24x CL_OuterPlatePin * 30x CL_OuterPlate * 60x CL_Roller * 54x CL_InnerPlate Depending on your printer, you may need to sand the links to reduce friction in the chain. Otherwise the chain will skip and the time will not be accurate. Assembly: Chain assembly: Print some test pieces first and check the fit. The CL_OuterPlate should fit snugly on the pins with some force and stay (use a hammer if needed). Assemble like shown in the pictures. There should be 5 rollers between the numbers. Body assembly: Insert bearing into the holder. Push pin through the bearing, as shown in the pictures. Push the Big Gear onto the pin. Insert clock mechanism and secure it with lid. Push the Small Gear onto the minute hand of the clock mechanism. Insert the assembled holder into the enclosure and secure it with M3 screws. Push one of the Sprockets onto the pin.