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The moving pawl advances the ratchet wheel 1 tooth on each 1-minute cycle. (Of course, these do not need to be hidden – maybe your design includes some crazy coiled wires connecting things.)

The lever triggers a hidden Hall effect sensor via a hidden magnet to let the microprocessor know cycle timing.

The lever changes direction of motion from vertical to horizontal.

The lever reduces the amount of motion of the float to a smaller movement of the moving pawl via unequal length arms.

The lever is on a pivot at one end and rests on the top of the float shaft at the other end. This project exercises several disciplines: woodworking, electronics, programming, math, metalworking, and even a bit of plumbing! I’ve done the math, essentially all of the progrogramming, and electronics design work for you, but you will need the other skills to build this Instructable. Of course you can alter the dimensions to suit your needs. I’m providing critical dimensions so that you can fabricate similar parts any way you choose. I carved many of the other parts with my Carvewright, but these need not be so fancy.

If you have a CNC machine or a 3D printer, there are free gear designer applications on the web that would allow you to design gears with the number of teeth that I used for this project. In place of proprietary files, I’m including pfd plans for the wheels and pinions that could be cut out using a band saw or scroll saw. Carvewright uses proprietary file formats, so the files are not useful unless you have a Carvewright machine. I used a Carvewright CNC to cut the non-metallic parts and Carvewright Designer software to design these parts. This is not a set of plans for building the exact clock that I made rather, a how-to to design and build your own. I’ve linked a short, speeded-up video to demonstrate the mechanism. A microcontroller monitors and adjusts the flow of the pump to maintain an exact one minute cycle and keep accurate time.

The ratchet wheel has 60 teeth, and the siphon cycle is one minute, so the ratchet directly drives the minute hand. A float in the siphon is connected by a lever to a ratchet and pawl mechanism. I’m using an electric pump to continuously supply the siphon. Here’s a link to a drawing of an ancient clock: This type of clock dates back to the 3rd century BC. This action moves a float up and down, and some type of connected mechanism displays the time. A steady stream of water fills a chamber, and a siphon periodically drains it. This is my steampunk clepsydra (“water thief”) clock.